Hit The Wall
Having a hero who can walk is fun, but it would be even more fun if the hero could hit the brick wall... With his face! Handling collisions with walls is not that hard. We've done this in WinFormGames before. Given this situation:
We first want to find the rectangle for both link (outlined blue) and the obstacle (outlined green):
Using these two rectangles we want to see if they intersect. To do this we look for an intersection rectangle (outlined in red):
If the intersection(red) rectangle has an area greater than 0 (That is, if a collision has happened) we must resolve the collision. We do this by moving the character to the left, right up or down by the width or height of the intersection.
New Project
Let's make a new project, call it HitTheWall and get this project up to par with the MovingPractice section of the writeup. We're going to work from here.
Intersection
From the above description it becomes clear that we need to be able to get an intersection rectangle between two rectangles. We're going to add this ability to a common helper class. If this method is looking alien try to draw out all of the intersection cases on paper and follow it trough for each.
Let's make a new file, call it Intersections.cs and add the follwoing class to it:
using System.Drawing;
namespace HitTheWall {
class Intersections {
public static Rectangle Rect(Rectangle a, Rectangle b) {
Rectangle result = new Rectangle(0,0,0,0);
// Do they even intersect?
if (a.Left < b.Right && a.Right > b.Left && a.Top < b.Bottom && a.Bottom > b.Top) {
// They intersect, let's get the intersection
result.X = System.Math.Max(a.Left, b.Left);
result.Y = System.Math.Max(a.Top, b.Top);
int right = System.Math.Min(a.Right, b.Right);
int bottom = System.Math.Min(a.Bottom, b.Bottom);
// Originally i assumed there might be an error in this function, because what if
// right is less than result.X? After reviewing the above math on paper i realize
// that these concerns where ungrounded, and that right will ALWAYS be greater!
result.Width = right - result.X;
result.Height = bottom - result.Y;
}
return result;
}
}
}
If you end up drawing and labeling these, remember X / Y is the same as Top / Left. But Width / Height are different from Bottom / Right:
Character Refactor
We're going to need to know some information about the character that we don't already know. Nameley we will need to know the center point of the character, and the bounding rectangle of the character. Remember, these can be different for every frame.
We're going to add some getters for the missing information, remember this is going in the Character
class, not PlayerCharacter. You should have enough information to figure these attributes out. Implement these getters:
public PointF Center {
get {
// TODO
}
}
public Rectangle Rect {
get {
// TODO
}
}
If you have any questions about the implementation of these, don't hesitate to ask. While we're in the Character
let's update the Render function with some debug code.
public void Render() {
GraphicsManager.Instance.DrawRect(Rect, Color.Red);
TextureManager.Instance.Draw(Sprite, new Point((int)Position.X,(int)Position.Y), 1.0f, SpriteSource[currentSprite][currentFrame]);
Rectangle center = new Rectangle((int)Center.X - 5, (int)Center.Y - 5, 10, 10);
GraphicsManager.Instance.DrawRect(center, Color.Yellow);
}
Adding the debug code should draw link with a red square the size of his bounding box behind him and with a yellow box at his sprites center:
Let's also change the characters position from a getter to a variable. Find this line in Character.cs
public PointF Position { get; set; }
And change it to
public PointF Position = new PointF(0.0f, 0.0f);
Now that Position is a variable and not a getter we can modify the X and Y properties of the value directly. Open up PlayerCharacter.cs
Find and remove these two lines
PointF positionCpy = Position;
// ...
Position = positionCpy;
And replace every instance of positionCpy
with Position
We're going to change one last thing about the Character
class. Back in Character.cs add the following code to the class
public PointF[] Corners {
get {
float w = SpriteSource[currentSprite][currentFrame].Width;
float h = SpriteSource[currentSprite][currentFrame].Height;
return new PointF[] {
new PointF(Position.X, Position.Y), // Top Left
new PointF(Position.X + w, Position.Y), // Top Right
new PointF(Position.X, Position.Y + h), // Bottom Left
new PointF(Position.X + w, Position.Y + h) // Bottom Right
};
}
}
public static readonly int CORNER_TOP_LEFT = 0;
public static readonly int CORNER_TOP_RIGHT = 1;
public static readonly int CORNER_BOTTOM_LEFT = 2;
public static readonly int CORNER_BOTTOM_RIGHT = 3;
The Corners
accessor will return an array of 4 points. Each point is one of the corners of the player sprite. After that we have some named constants. These constants will allow us to access the Corners
array by name isntead of having to remember hard coded numbers. Like so:
Rectangle topRight = heroChar.Corners[2]; // Flaky, we don't want to do this
Rectangle topLeft = heroChar.Corners[Hero.CORNER_TOP_LEFT]; // Sexy, ALWAYS DO THIS!
Let's visualize what this looks like. Change the Render
function in Character.cs to:
public void Render() {
GraphicsManager.Instance.DrawRect(Rect, Color.Red);
TextureManager.Instance.Draw(Sprite, new Point((int)Position.X, (int)Position.Y), 1.0f, SpriteSource[currentSprite][currentFrame]);
Rectangle center = new Rectangle((int)Center.X - 5, (int)Center.Y - 5, 10, 10);
GraphicsManager.Instance.DrawRect(center, Color.Yellow);
foreach(PointF corner in Corners) {
Rectangle rect = new Rectangle((int)corner.X - 5, (int)corner.Y - 5, 10, 10);
GraphicsManager.Instance.DrawRect(rect, Color.Green);
}
}
Your code at this point should look like this:
Resolving collisions
Nine times out of ten resolving collisions is going to go in the same function that handles input. (What's the case when this isn't how it happens? When solving continous integration systems in a Physics engine). In order to resolve collisions we need to know a few things.
- Move the character
- Get a list of obstacles the character can hit.
- Check if character has hit obstacle
- If so, undo the move action (clamp to obstacle)
Pretty simple. We basically move, check if the move is valid and undo the move if it's not.
If you are being clever and getting obstacles relative to theplayer, it's very important that you move the character first, then get the list of obstacles. This is because the list of obstacles will usually change based on the characters position. If the character moves you need the latest, most up to date obstacles. We're going to be clever and do this :)
The other option is to brute force the deal, this means checking and trying to resolve the characters collision against every collidable object all the time. This method might work for smaller games, but the list of collisions to check will quickly grow out of hand. Most of the time brute force will simply not be an option due to performance reasons. We will not be doing brute force.
Game Refactor
Looking at the above list of how to resolve collisions we already know how to move the character. We however don't know how to get a list of obstacles that the character can collide with. This functionality is going to be given to Game.cs.
We're not going to call any new functions in Game. Instead we're going to add helper functions that will be called from inside of PlayerCharacter
we can do this because Game
is a singleton. We're going to write two helper functions GetTile
and GetTileRect
both of them are going to take a PointF
as an argument.
How are these new functions going to be used? Inside of PlayerCharacter
we're going to get the tile for one of the corners of the character. If the tile is NOT walkable, we're going to get it's rectangle (again, using one of the corner points). We will try to resolve collisions against this rectangle.
With that, add these functions to Game.cs
public Tile GetTile(PointF pixelPoint) {
// TODO: Get the x and y indices of the tile from pixelPoint
// Return the appropriate tile
return null; // Just so this compiles
}
public Rectangle GetTileRect(PointF pixelPoint) {
// TODO: Convert pixel point into a Rectangle that is on the tile grid
// Hint, xTile * tileSize = Grid X Position
// return the resulting rectangle
return new Rectangle(); // Just so this compiles
}
Try to fill those functions in. Let's also change how the rendering of the game works by adding more debug symbols! Change the Render
function in Game.cs to this:
public void Render() {
for (int h = 0; h < map.Length; h++) {
for (int w = 0; w < map[h].Length; w++) {
map[h][w].Render();
}
}
foreach (PointF corner in hero.Corners) {
if (GetTile(corner).Walkable) {
GraphicsManager.Instance.DrawRect(GetTileRect(corner), Color.Blue);
}
else {
GraphicsManager.Instance.DrawRect(GetTileRect(corner), Color.Violet);
}
}
hero.Render();
}
This render function actually demonstrates HOW we're going to use the GetTile
and GetTileRect
functions. Any tile that one of the player corners falls on is colored Blue or Violet. Blue tiles are walkable, Violet ones are not. When it comes time to Resolve Collisions, we only have to check the violet tiles. Checking so few tiles will make our game super performant.
Running your game, you should get something like the below screenshot. The blue / violet squares might not always be evenly distributed. That is at some points you might only see 2 tiles get colored. Walk around, you should see a few patterns.
Refactoring PlayerCharacter
Now comes the fun part. We're actually going to resolve collisions! BUT FIRST, lets do some house keeping! Let's make it so that the character can walk both up/down AND left/right at the same time. Inside PLayerCharacter.cs find and change:
else if (i.KeyDown(OpenTK.Input.Key.W) || i.KeyDown(OpenTK.Input.Key.Up)) {
to
if (i.KeyDown(OpenTK.Input.Key.W) || i.KeyDown(OpenTK.Input.Key.Up)) {
The way we do animations now is good, but an animation frame might change the Width / Height of our sprite. If the width or height is going to change, we want that to happen sooner, rather than later. Inside PlayerCharacter.cs we have a variable bool animating = false;
Remove that.
Find the animation code at the bottom of Update
and remove it. We're going to refactor it into an Animate
function, this is what it's going to look like:
protected void Animate(float deltaTime) {
animTimer += deltaTime;
if (animTimer > animFPS) {
currentFrame += 1;
animTimer -= animFPS;
if (currentFrame > SpriteSource[currentSprite].Length - 1) {
currentFrame = 0;
}
}
}
Again, inside of the Update
function replace everywhere aimation is set to true animating = true;
to a call to Animate Animate(deltaTime
.
Run the game it should at this point run as expected. Now it's time to resolve some collisions! The key to efficient collision resolution is to check as few things as possible. As long as the character is the same size or smaller than the tiles there can be at most two collisions at a time:
When link is moving in one direction, only his corners in that direction need to be checked. And it's not even his corners, it's the tile his corners fall on. In the middle example above, both the top and bottom corners fall on the same tile, so only one is checked. Here is a breakdown of which corners to check:
- Moving Left
- Check Top Left Corner
- Check Bottom Left Corner
- Moving Right
- Check Top Right Corner
- Check Bottom Right Corner
- Moving Up
- Check Top Left Corner
- Check Top Right Corner
- Moving Down
- Check Bottom Left Corner
- Check Bottom Right Corner
How do we actually go about checking these? Let's walk trough adding collision resolution when moving left. First, locate the code that moves link left:
if (i.KeyDown(OpenTK.Input.Key.A) || i.KeyDown(OpenTK.Input.Key.Left)) {
SetSprite("Left");
Animate(deltaTime);
positionCpy.X -= speed * deltaTime;
// Add collision resolution
}
- To add collision resolution, first lets check the TopLeftCorner.
- Use the Game class to get the tile at the top left corners Point
- Check to see if the tile is walkable. IF NOT:
- Get the intersection rectangle of the player and the tile
- An intersection happens if the intersection rect has an area > 0
- Check if intersect.W * intersect.H > 0, IF IT IS:
- Clamp player X to intersection rectangle right
Let's see what this would look like in code:
if (!Game.Instance.GetTile(Corners[CORNER_TOP_LEFT]).Walkable) {
Rectangle intersection = Intersections.Rect(Rect, Game.Instance.GetTileRect(Corners[CORNER_TOP_LEFT]));
if (intersection.Width * intersection.Height > 0) { // W * H == 0 if NO intersection happened!
Position.X = intersection.Right;
}
}
We don't need to fully qualify Rect
, Corner
or CORNER_TOP_LEFT
because we inherited them from Character
. We can access the helper functions of Game
trough it's singleton instance.
That takes care of the top left collision of moving left, we need to also check bottom left. It's going to more or less be the same code. Here is the entire key checker part of the code:
if (i.KeyDown(OpenTK.Input.Key.A) || i.KeyDown(OpenTK.Input.Key.Left)) {
SetSprite("Left");
Animate(deltaTime);
Position.X -= speed * deltaTime;
if (!Game.Instance.GetTile(Corners[CORNER_TOP_LEFT]).Walkable) {
Rectangle intersection = Intersections.Rect(Rect, Game.Instance.GetTileRect(Corners[CORNER_TOP_LEFT]));
if (intersection.Width * intersection.Height > 0) { // W * H == 0 if NO intersection happened!
Position.X = intersection.Right;
}
}
if (!Game.Instance.GetTile(Corners[CORNER_BOTTOM_LEFT]).Walkable) {
Rectangle intersection = Intersections.Rect(Rect, Game.Instance.GetTileRect(Corners[CORNER_BOTTOM_LEFT]));
if (intersection.Width * intersection.Height > 0) { // W * H == 0 if NO intersection happened!
Position.X = intersection.Right;
}
}
}
Run the game, walking to the left collisions should now happen. But you can walk trough tiles in any other direction. Go ahead and add collision resolution code to the rest of the movement directions. Keep in mind:
- Do walking Up after the Left sample. Up is easyer than Right
- When handling Right & Down, keep in mind that the players position 0,0 is top right
- You will have to subtract player width or height from the clamp position
Smooth movement
Right now walking around you can kind of get stuck in the wall at random spots. We can fix that. You get stuck in walls because the animation method changes the height of the player sprite. So we do collision checking on one frame with one height, but then turning left will change the height. Changing the height between aniamtions causes us to get stuck. It's an easy fix, find this code in PlayerCharacter.cs
public PlayerCharacter(string spritePath, Point pos) : base(spritePath, pos) {
AddSprite("Down", new Rectangle(59, 1, 24, 30), new Rectangle(87, 1, 24, 30));
AddSprite("Up", new Rectangle(115, 3, 22, 28), new Rectangle(141, 3, 22, 28));
AddSprite("Left", new Rectangle(1, 1, 26, 30), new Rectangle(31, 1, 26, 31));
AddSprite("Right", new Rectangle(195, 1, 26, 30), new Rectangle(167, 1, 26, 29));
SetSprite("Down");
}
And change it to have a uniform height
public PlayerCharacter(string spritePath, Point pos) : base(spritePath, pos) {
AddSprite("Down", new Rectangle(59, 1, 24, 30), new Rectangle(87, 1, 24, 30));
AddSprite("Up", new Rectangle(115, 3, 22, 30), new Rectangle(141, 3, 22, 30));
AddSprite("Left", new Rectangle(1, 1, 26, 30), new Rectangle(31, 1, 26, 30));
AddSprite("Right", new Rectangle(195, 1, 26, 30), new Rectangle(167, 1, 26, 30));
SetSprite("Down");
}
DONE, Run the game. Moving is smooth as a button and collisions work correctly in all directions.
Check in
Check in with me when you finished this part before moving onto the next bit. I want to review the code written up to this point.


Level
Mob level must be between 1 and 99.
Gender
{{ gender.name }}
Genders required
Race
{{ race.name }}
race is required
Class
{{ class.name }}
class required
Alignment
{{ alignment.name }}
alignment required
Status
{{ status.name }}
status required
Default Attack Type
{{ attack.name }}
attack required


public final class RMIHandler
extends java.lang.Object
getRMIHandler(...)
method| Modifier and Type | Method and Description |
|---|---|
void |
dispose(boolean signalFault)
Dispose this
RMIHandler and frees all the used resources and threads. |
boolean |
equals(java.lang.Object obj) |
java.lang.Exception |
getDispositionException()
Gets the exception that caused this handler to be disposed.
|
long |
getDispositionTime()
Gets the time at which this handler has been disposed.
|
java.net.InetSocketAddress |
getInetSocketAddress()
Gets the address of the remote process (IP address + TCP port)
|
java.lang.Object |
getStub(java.lang.String objectId)
Gets a stub for the specified object identifier representing a remote object
on the remote machine.
|
java.lang.Object |
getStub(java.lang.String objectId,
java.lang.Class<?>... stubInterfaces)
Gets a stub for the specified object identifier respect to the specified
interfaces, representing a remote object on the remote machine.
|
int |
hashCode() |
boolean |
isDisposed()
Gets the disposed status of this peer
|
boolean |
isOwnStub(java.lang.Object stub)
Check if the given object is a stub created by this handler
|
void |
removeOwnStubs(java.lang.Iterable<?> objects)
Removes all the objects that are stubs created by this handler from the
specified iterable object
|
void |
retainOwnStubs(java.lang.Iterable<?> objects)
Removes all the objects that are not stubs created by this handler from the
specified iterable object
|
java.lang.String |
toString() |
public void dispose(boolean signalFault)
RMIHandler
and frees all the used resources and threads.
A call to this method can cause a callback on the RMIFaultHandler
instances attached to the RMIRegistry
associated to this instance
sending them the disposition exception of this handler (See
getDispositionException()
).signalFault
- set to true if this RMIHandler
should send a
signal to the RMIFaultHandler
instances attached
to the RMIRegistry
that created this instancepublic java.net.InetSocketAddress getInetSocketAddress()
InetSocketAddress
containing remote host address and portpublic boolean isOwnStub(java.lang.Object stub)
stub
- the object to checkpublic void removeOwnStubs(java.lang.Iterable<?> objects)
objects
- the iterable object to analyzepublic void retainOwnStubs(java.lang.Iterable<?> objects)
objects
- the iterable object to analyzepublic boolean isDisposed()
public java.lang.Object getStub(java.lang.String objectId) throws java.net.UnknownHostException, java.io.IOException, java.lang.InterruptedException
objectId
- the object identifierjava.net.UnknownHostException
- if the host cannot be resolvedjava.io.IOException
- if an I/O error occursjava.lang.InterruptedException
- if the current thread is iterrupted during
operationpublic java.lang.Object getStub(java.lang.String objectId, java.lang.Class<?>... stubInterfaces)
objectId
- the object identifierstubInterfaces
- the interface whose methods must be stubbed, that is
the interface used to access the remote object
operationspublic long getDispositionTime()
public java.lang.Exception getDispositionException()
public int hashCode()
hashCode
in class java.lang.Object
public boolean equals(java.lang.Object obj)
equals
in class java.lang.Object
public java.lang.String toString()
toString
in class java.lang.Object


Screens
Current screen is {{ currentScreen }}
{% for key, screen in screens.items() %}
{% endfor %}
Players
{% for player in players %}
{{ player }}
{% endfor %}


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Sanjay Associates is a leading Indian Chartered Accountant firm in Ghaziabad, led by skilled and experienced Indian Chartered Accountants having industry experience of over a decade. Our vast knowledge, expertise and core competence in various areas helps us to serve our client’s varied needs and achieve Total Customer Satisfaction.
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To be the No.1 Indian Chartered Accountant firm by delivering quality solutions in professional and time-bound manner. View details »
To achieve “Total Customer Satisfaction” by delivering quality services in professional and time-bound manner. View details »
Our team consists of highly qualified and experienced chartered accountants and other professionals. View details »
We have a very high quality standards and ensure that our services are of the Highest Quality in the Industry. View details »
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I launched it for height 50000 then 100000 then 150000 before trying to have coinsupply until current height:
komodo-cli -ac_name=LABS coinsupply
{
"result": "success",
"coin": "LABS",
"height": 231070,
"supply": 2436848.41926284,
"zfunds": 99.99701600,
"sprout": 0.00000000,
"total": 2436948.41627884
}


Pat Salmon Cookies
Sales Data
Welcom To Pat's Salmon Cookies
Visit Us (open from 6am to 8pm)
Seattle
Tokyo
Paris
Dubai
Lima
Gallery


Convert an epoch to Besselian or Julian to match another one.
CALL:
D = sla_EPCO (K0, K, E)
GIVEN:
K0
C
form of result: `B'=Besselian, `J'=Julian
K
C
form of given epoch: `B' or `J'
E
D
epoch
RETURNED:
sla_EPCO
D
the given epoch converted as necessary
NOTES:
1.
The result is always either equal to or very close to
the given epoch E. The routine is required only in
applications where punctilious treatment of heterogeneous
mixtures of star positions is necessary.
2.
K0 and K are not validated. They are interpreted as follows:
If K0 and K are the same, the result is E.
If K0 is `B' and K isn't, the conversion is J to B.


--- layout: default permalink: /progress category: components category_page: Component title: Progress description: "Native HTML progress bars customized with a single class and different colors." ---
Progress bars only have one size but you can change it by directly styling a style.


Before Change
def __str__(self):
s = self.desc + ", dimensions were "
s += " ".join(["(" + str(d) + ")" for d in self.dims])
return s
def is_scalar_type(obj):
After Change
def __str__(self):
s = self.desc
if len(self.dims) == 1:
s += ", unit was " + repr(get_unit(self.dims[0]))
elif len(self.dims) == 2:
d1, d2 = self.dims
s += ", units were %r and %r" % (get_unit(d1), get_unit(d2))
else:
s += (", units were " +
" ".join(["(" + repr(get_unit(d)) + ")" for d in self.dims]))
return s
def is_scalar_type(obj):


open class Builder
Builder for configuring and creating an associated camera source.
Builder(context: Context, detector: Detector<*>)
Creates a camera source builder with the supplied context and detector. Camera preview images will be streamed to the associated detector upon starting the camera source. |
open fun build(): CameraSource
Creates an instance of the camera source. |
|
open fun setFacing(facing: Int): Builder
Sets the camera to use (either |
|
open fun setFlashMode(mode: String): Builder |
|
open fun setFocusMode(mode: String): Builder |
|
open fun setRequestedFps(fps: Float): Builder
Sets the requested frame rate in frames per second. If the exact requested value is not not available, the best matching available value is selected. Default: 30. |
|
open fun setRequestedPreviewSize(width: Int, height: Int): Builder
Sets the desired width and height of the camera frames in pixels. If the exact desired values are not available options, the best matching available options are selected. Also, we try to select a preview size which corresponds to the aspect ratio of an associated full picture size, if applicable. Default: 1024x768. |


Use the fields on the right to login to the FI-STAR Application Marketplace and easily deploy application over FI-STAR and FI-WARE infrastructure!
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This library provides annotations to allow easy integration of domain classes
with the DataMapper
defined in @block65/dynamodb-data-mapper
. These annotations
are provided in a separate NPM package because they rely on two experimental
features of TypeScript (decorators and metadata decoration) and depend on the
reflect-metadata
package.
To use the annotations, you will first need to enable two TypeScript compiler
settings: experimentalDecorators
and emitDecoratorMetadata
. The former
enables the use of annotations in your project, and the latter emits type
information about declared property classes.
Next, start adding table
annotations to the domain models that represent
records in your DynamoDB tables and attribute annotations to the declared
properties that map to attributes of those records:
import {
attribute,
autoGeneratedHashKey,
rangeKey,
table,
versionAttribute,
} from '@block65/dynamodb-data-mapper-annotations';
import uuidV4 = require('uuid/v4');
@table('my_table')
class MyDomainClass {
@autoGeneratedHashKey()
id: string;
@rangeKey({defaultProvider: () => new Date()})
createdAt: Date;
@versionAttribute()
version: number;
@attribute()
toggle?: boolean;
@attribute({memberType: 'String'})
tags?: Set<string>;
// This property will not be saved to DynamoDB.
notPersistedToDynamoDb: string;
}
Using these annotations will automatically define properties at the
DynamoDbSchema
and DynamoDbTable
symbols on the class prototype, meaning
that you can pass instances of the class directly to a DataMapper
instance. No
need to define a schema separately; your class's property type declarations are
the schema.
To declare a class corresponding to a map attribute value in a DynamoDB record,
simply omit the table
annotation:
import {
attribute,
hashKey,
table,
} from '@block65/dynamodb-data-mapper-annotations';
import {embed} from '@block65/dynamodb-data-mapper';
class Comment {
@attribute()
author?: string;
@attribute()
postedAt?: Date;
@attribute()
text?: string;
}
@table('posts')
class BlogPost {
@hashKey()
id: string;
@attribute()
author?: string;
@attribute()
postedAt?: Date;
@attribute()
text?: string;
@attribute({memberType: embed(Comment)})
replies?: Array<Comment>
}
attribute
Marks a property as an attribute in the mapped DynamoDB record. The annotation will attempt to infer the correct DynamoDB type from the TypeScript type metadata, though no metadata will be available for any generic type parameters used.
attribute
must be called as a function and accepts an optional argument
containing a partial or complete field schema definition.
autoGeneratedHashKey
Designates the property as representing the record's hash key. If no key is defined, a V4 UUID will be used.
autoGeneratedHashKey
must be called as a function and accepts an optional
argument containing a partial or complete field schema definition.
hashKey
Designates the property as representing the record's hash (partition) key.
hashKey
must be called as a function and accepts an optional argument
containing a partial or complete field schema definition.
rangeKey
Designates the property as representing the record's range (sort) key.
rangeKey
must be called as a function and accepts an optional argument
containing a partial or complete field schema definition.
table
Designates a class as representing a table in DynamoDB.
table
must be called as a function with that table name as the only argument.
versionAttribute
Designates the property as representing the record's version attribute. The data
mapper will use optimistic locking by incrementing the version attribute during
put
and update
operations and sending a condition expression with all put
,
update
, and delete
operations that will cause the operation to fail if the
record in the database has a version number that does not match the one held by
the client.
versionAttribute
must be called as a function and accepts an optional argument
containing a partial or complete field schema definition.
Because this package relies on experimental TypeScript features, it is subject to change and should be considered beta software. Decorators are currently on the ECMAScript standards track, but the accepted form may differ from that implemented by TypeScript, which could cause the public interface presented by this project to change.
Please note that TypeScript does not emit any metadata about the type parameters
supplied to generic types, so Array<string>
, [number, string]
, and
MyClass[]
are all exposed as Array
via the emitted metadata. Without
additional metadata, this annotation will treat all encountered arrays as
collections of untyped data. You may supply either a members
declaration or a
memberType
declaration to direct this annotation to treat a property as a
tuple or typed list, respectively.
Member type declarations are required for maps and sets, though the member type
will be automatically inferred if a property is declared as being of type
BinarySet
or NumberValueSet
(from the @block65/dynamodb-auto-marshaller
package).


In the 01 Domain Names exercise you pointed your domain name to the course web hosting server located at <IP_ADDRESS>. However, a web server can host multiple websites. Simply pointing your domain name to a web server’s IP address won’t tell the web browser where your specific files are located. Web servers are very similar to apartment buildings in how their addresses are organized. For example a street address will point to a single apartment building much like an IP address will point to a single web server. Within an apartment building there are individual apartments each with their own unique address, and web servers are setup exactly the same way.
Currently, you are missing the apartment number for the content you will be creating. Until you setup your apartment on the web server, it’s not in the server’s directory. So, if you waited the appropriate amount of time after updating your DNS settings, between 4 and 24 hours, and you type in your domain name into a web browser you will be directed to the web server’s default web page, not your website! In this exercise you will setup your web hosting account so anyone can find your future website by typing in the domain name you registered.
In a gross oversimplification of web hosting, it’s simply a computer with a 24/7 connection to the internet that stores files that you upload to it. Since the computer is always connected to the internet when someone types a domain name into their web browser they are immediately redirected to the web server storing your files and then begin to download the content for you to view on your computer.
Obviously there is a lot more involved with web hosting. There are security issues that need to be monitored and accounted for. When you log into your managed hosting account you will have a control panel that will let you manage a lot of different features. If you plan on using an open source Content Management System, commonly referred to as a CMS, such as WordPress or Magento you need to have hosting that supports databases as well. There are a lot of companies out there where you can purchase web hosting from such as BlueHost, DreamHost, and Media Temple ranging from $4.00 to $20.00 a month. Many of the web hosting companies also offer email hosting so you can have an email address that matches your domain name.
When you sign up for a service like Squarespace or Shopify, it’s very similar to purchasing web hosting, with one big difference: the CMS is already installed. Simply put, these website builders are web hosting services running their own proprietary software to help you create and manage a website. There is nothing wrong with using these services, but for the sake of this course and learning about the web as a medium you are going to learn to use web hosting to manage your custom built web pages.
In the past I’ve asked students to sign up for web hosting accounts so they can complete the exercises in this course, but that has been problematic. First, it can get expensive. Usually to get that $4.00 a month rate you need sign up for two or even three years, otherwise you are going to pay $12.00 to $20.00 for a month to month basis. However, the biggest reason I now avoid using commercial web hosting is lack of access. When you have trouble with something in this course, simply emailing me you have a problem just doesn’t work. I need access to the code to see where you made your mistake. To have access to your files I would need your username and password, and quite frankly I don’t want that and I would assume that you would not want to share that.
To replicate commercial web hosting services for the learning experience and to have access to your files in a non intrusive way I have set up a web hosting service using an open source web hosting panel called Sentora. Sentora gives me the ability to supply you web hosting that mimics what is commercially available. It also lets me view the files you upload to the server without you having to share your passwords with me. Best of all, it’s free for you to use for the duration of the course, and thereafter until the web server runs out of room and I have to remove older users.
At the start of each semester I create a web hosting account for each student enrolled in the course. The welcome email containing the necessary login information will be sent to your campus email account. If you don’t see the welcome email look in your spam folder, it may have ended up there. If you misplace the original email, you can search for it by the subject line “Your Art 336 Web Hosting Account Details”.
Before you go further, be certain to follow the screencast and update your basic information, specifically your email address. I strongly suggest that you update your email address to one that you check regularly and will have access to post graduation. Since I don’t remove accounts until the server starts to run out of room, you may have access to your web hosting account for personal use well after graduation. In the event that I need to remove you from the server, I would like to be able to tell you before I do it so you can make other arrangements. I can’t do that if you don’t give me a reliable email address!
Finally, you can also change your default password. The password sent to you in your welcome email is randomly generated and I don’t have access to it. Even though I don’t have access to it, it’s pretty hard to remember unless you are using a password manager like 1Password or LastPass, so you may want to change it to something you will easily remember.
Going back to the apartment analogy, that’s what you will be doing in this step. Since your domain name is pointing to the IP address of the course web server, you need to tell the web server where your files will be located.
For the sake of this course, you won’t be putting your finished exercises in this directory. This directory is reserved for you to create and host your own personal website. As you complete this course you will learn all the necessary skills to create your own portfolio website, so take advantage of that.
Tip: when following along with the screencast, you need to use your own domain name, not mine!
A domain name is something like http://yourname.com, or a real world example would be http://oldnavy.com. However, for organization purposes it’s better use a subdomain to direct users to your web pages. Using http://oldnavy.com as our real world example again, you’ll notice that when you enter that domain name into a web browser you get redirected to http://oldnavy.gap.com. Since Gap is the parent company of Old Navy, the content managers though it best for marketing purposes to use “oldnavy” as a subdomain of gap.com.
In the following screencast you are going to be creating your subdomain named “art336” to upload your course exercises to. When you are done, you will have a subdomain that looks something like http://art336.yourname.com where you will upload your exercises to.
Now that you have setup your web hosting account so you have directories to store your files on the web server you need a way to transfer the files from your computer to the course web server. Fortunately there is an easy way to do this using the File Transfer Protocol, or better known as FTP. To use FTP to transfer your files, you will need to create a FTP user in your Sentora Web Hosting account which is covered in the following screencast.
Tip: this time, use the same “ftp” username that I use in the screencast. After you create the user, you will notice that your actual ftp username that you will be using to transfer files will look similar to “yourname_ftp”. As for the password, use whatever you will remember, and no, I don’t have access to your ftp password either.


doctools_lang_cmdref - doctools language command reference
This document specifies both names and syntax of all the commands which together are the doctools markup language, version 1. As this document is intended to be a reference the commands are listed in alphabetical order, and the descriptions are relatively short. A beginner should read the much more informally written doctools language introduction first.
Text markup. The argument text is marked up as the argument of a command. Main uses are the highlighting of command arguments in free-form text, and for the argument parameters of the markup commands call and usage.
Text structure. List element. Argument list. Automatically closes the previous list element. Specifies the data-type of the described argument of a command, its name and its i/o-mode. The latter is optional.
Deprecated. Text structure. List element. Itemized list. See item for the canonical command to open a list item in an itemized list.
Text structure. List element. Definition list. Automatically closes the previous list element. Defines the term as a command and its arguments. The first argument is the name of the command described by the following free-form text, and all arguments coming after that are descriptions of the command's arguments. It is expected that the arguments are marked up with arg, method, option etc., as is appropriate, and that the command itself is marked up with cmd. It is expected that the formatted term is not only printed in place, but also in the table of contents of the document, or synopsis, depending on the output format.
Document information. Anywhere. This command registers its plain text arguments as the category this document belongs to. If this command is used multiple times the last value specified is used.
Text markup. The argument is marked up as the name of a class. The text may have other markup already applied to it. Main use is the highlighting of class names in free-form text.
Text markup. The argument text is marked up as the name of a Tcl command. The text may have other markup already applied to it. Main uses are the highlighting of commands in free-form text, and for the command parameters of the markup commands call and usage.
Text structure. List element. Command list. Automatically closes the previous list element. The argument specifies the name of the Tcl command to be described by the list element. Expected to be marked up in the output as if it had been formatted with cmd.
Text markup. The argument text is marked up as a comment standing outside of the actual text of the document. Main use is in free-form text.
Text markup. The argument is marked up as a constant value. The text may have other markup already applied to it. Main use is the highlighting of constants in free-form text.
Document information. Anywhere. The command registers the plain text argument as a copyright assignment for the manpage. When invoked more than once the assignments are accumulated.
Text structure. List element. Definition list. Automatically closes the previous list element. The argument text is the term defined by the new list element. Text markup can be applied to it.
Document structure. This command separates the header from the document body. Implicitly starts a section named "DESCRIPTION" (See command section).
Text structure. List element. Enumerated list. Automatically closes the previous list element.
Text markup. The argument text is marked up as emphasized. Main use is for general highlighting of pieces of free-form text without attaching special meaning to the pieces.
Text structure, Text markup. This command marks its argument up as an example. Main use is the simple embedding of examples in free-form text. It should be used if the example does not need special markup of its own. Otherwise use a sequence of example_begin ... example_end.
Text structure. This commands starts an example. All text until the next example_end belongs to the example. Line breaks, spaces, and tabs have to be preserved literally. Examples cannot be nested.
Text structure. This command closes the example started by the last example_begin.
Text markup. The argument is marked up as a file or directory, i.e. in general a path. The text may have other markup already applied to it. Main use is the highlighting of paths in free-form text.
Text markup. The argument is marked up as the name of a function. The text may have other markup already applied to it. Main use is the highlighting of function names in free-form text.
Text markup. The argument is the symbolic name of an image and replaced with the image itself, if a suitable variant is found by the backend. The second argument, should it be present, will be interpreted the human-readable description of the image, and put into the output in a suitable position, if such is supported by the format. The HTML format, for example, can place it into the alt attribute of image references.
Templating. The contents of the named file are interpreted as text written in the doctools markup and processed in the place of the include command. The markup in the file has to be self-contained. It is not possible for a markup command to cross the file boundaries.
Text structure. List element. Itemized list. Automatically closes the previous list element.
Document information. Anywhere. This command registers all its plain text arguments as keywords applying to this document. Each argument is a single keyword. If this command is used multiple times all the arguments accumulate.
Text. The command is replaced with a left bracket. Use in free-form text. Required to avoid interpretation of a left bracket as the start of a markup command.
Text structure. This command starts a list. The exact nature of the list is determined by the argument what of the command. This further determines which commands are have to be used to start the list elements. Lists can be nested, i.e. it is allowed to start a new list within a list element.
The allowed types (and their associated item commands) are:
arg_def.
cmd_def.
def and call.
enum
item
opt_def
tkoption_def
Additionally the following names are recognized as shortcuts for some of the regular types:
Short for arguments.
Short for commands.
Short for enumerated.
Short for itemized.
Short for options.
At last the following names are still recognized for backward compatibility, but are otherwise considered to be deprecated.
Deprecated. See arguments.
Deprecated. See itemized.
Deprecated. See commands.
Deprecated. See options.
Deprecated. See tkoptions.
Text structure. This command closes the list opened by the last list_begin command coming before it.
Deprecated. Text structure. List element. Definition list. See def for the canonical command to open a general list item in a definition list.
Document structure. The command to start a manpage. The arguments are the name of the command described by the manpage, the section of the manpages this manpage resides in, and the version of the module containing the command. All arguments have to be plain text, without markup.
Document structure. Command to end a manpage/document. Anything in the document coming after this command is in error.
Text markup. The argument text is marked up as the name of an object method, i.e. subcommand of a Tcl command. The text may have other markup already applied to it. Main uses are the highlighting of method names in free-form text, and for the command parameters of the markup commands call and usage.
Document information. Header. Registers the plain text argument as a short description of the module the manpage resides in.
Text markup. The argument text is marked up as a namespace name. The text may have other markup already applied to it. Main use is the highlighting of namespace names in free-form text.
Deprecated. Text structure. See para for the canonical command to insert paragraph breaks into the text.
Text markup. The argument text is marked up as optional. The text may have other markup already applied to it. Main use is the highlighting of optional arguments, see the command arg arg.
Text structure. List element. Option list. Automatically closes the previous list element. Specifies name and arguments of the option described by the list element. It is expected that the name is marked up using option.
Text markup. The argument is marked up as option. The text may have other markup already applied to it. Main use is the highlighting of options, also known as command-switches, in either free-form text, or the arguments of the call and usage commands.
Text markup. The argument is marked up as the name of a package. The text may have other markup already applied to it. Main use is the highlighting of package names in free-form text.
Text structure. This command breaks free-form text into paragraphs. Each command closes the paragraph coming before it and starts a new paragraph for the text coming after it. Higher-level forms of structure are sections and subsections.
Text. The command is replaced with a right bracket. Use in free-form text. Required to avoid interpretation of a right bracket as the end of a markup command.
Document information. Header. This command registers its argument package as the name of a package or application required by the described package or application. A minimum version can be provided as well. This argument can be marked up. The usual markup is opt.
Text structure. This command starts a new named document section. The argument has to be plain text. Implicitly closes the last paragraph coming before it and also implicitly opens the first paragraph of the new section.
Text markup. Formats a reference to the section identified by id. If no text is specified the title of the referenced section is used in the output, otherwise text is used.
Text markup. Like sectref, except that the section is assumed to be in a different document and therefore doesn't need to be identified, nor are any checks for existence made. Only the text to format is needed.
Document information. Anywhere. The command defines direct cross-references to other documents. Each argument is a plain text label identifying the referenced document. If this command is used multiple times all the arguments accumulate.
Deprecated. Text markup. See emph for the canonical command to emphasize text.
Text structure. This command starts a new named subsection of a section. The argument has to be plain text. Implicitly closes the last paragraph coming before it and also implicitly opens the first paragraph of the new subsection.
Text markup. The argument text is marked up as the name of an external command. The text may have other markup already applied to it. Main use is the highlighting of external commands in free-form text.
Text markup. The argument is marked up as unspecific terminology. The text may have other markup already applied to it. Main use is the highlighting of important terms and concepts in free-form text.
Document information. Header. Optional. Registers the plain text argument as the title of the manpage. Defaults to the value registered by moddesc.
Text structure. List element. Widget option list. Automatically closes the previous list element. Specifies the name of the option as used in scripts, the name used by the option database (dbname), and its class (dbclass), i.e. its type. It is expected that the name is marked up using option.
Text markup. The argument is marked up as the name of a data type. The text may have other markup already applied to it. Main use is the highlighting of data types in free-form text.
Text markup. The argument is marked up as an uri (i.e. a uniform resource identifier. The text may have other markup already applied to it. Main use is the highlighting of uris in free-form text. The second argument, should it be present, will be interpreted the human-readable description of the uri. In other words, as its label. Without an explicit label the uri will be its own label.
Text markup. See call for the full description, this command is syntactically identical, as it is in its expectations for the markup of its arguments. In contrast to call it is however not allowed to generate output where this command occurs in the text. The command is silent. The formatted text may only appear in a different section of the output, for example a table of contents, or synopsis, depending on the output format.
Text markup. The argument is marked up as the name of a variable. The text may have other markup already applied to it. Main use is the highlighting of variables in free-form text.
Templating. In this form the command sets the named document variable to the specified value. It does not generate output. I.e. the command is replaced by the empty string.
Templating. In this form the command is replaced by the value of the named document variable
Text markup. The argument is marked up as the name of a widget. The text may have other markup already applied to it. Main use is the highlighting of widget names in free-form text.
This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category doctools of the Tcllib Trackers. Please also report any ideas for enhancements you may have for either package and/or documentation.
When proposing code changes, please provide unified diffs, i.e the output of diff -u.
Note further that attachments are strongly preferred over inlined patches. Attachments can be made by going to the Edit form of the ticket immediately after its creation, and then using the left-most button in the secondary navigation bar.
Documentation tools
Copyright © 2007-2010 Andreas Kupries <andreas_kupries@users.sourceforge.net>


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Perl Weekly
Issue #123 - 2013-12-02 - Advent started
latest | archive | by Gabor Szabo
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Hi,
The week started with very few articles but in the last 2-3 days, people started to write tons of interesting stuff. In addition, Advent started and with that the advent calendars. You'll have plenty of material to read or watch.
Enjoy!
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Sponsors
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We're Hiring Perl Software Developers - Grant Street Group
We're a growing software company using open source software/modern Perl practices to build innovative e-payment, auction, and tax collection web applications. We're looking for talented, motivated professionals committed to flawless work and customer service. Email resume<EMAIL_ADDRESS>|
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Announcements
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DWIM Perl for Linux 5.18.1
This is a Perl distribution for Linux. The first release of the new series of releases that come with C libraries as well. This version comes with XML::LibXML (and thus libxml2). Just download, unzip and you can use it. List of extra CPAN modules on the site of DWIM Perl for Linux
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Articles
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The xdg channel - Thanksgiving missive
Look, new toys! David Golden worked on quite a few CPAN modules lately without blogging about them. Now he collected the list: Class::Tiny, Path::Tiny, MooseX::Role::MongoDB,CPAN::Common::Index just to mention some of them.
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Perl in Banks
Is Perl a secret weapon in Banks? Do any of them admit it? Can you find people who work at some of the largest money-making institutions that heavily rely on Perl. Dave Cross reposted a request for some 'proof that Perl is indeed used in the finance industry' and he got quite some. Now how can you turn this into money?
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Testing
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Including CPAN Testers results in the adoption list
The CPAN adoption list ranks modules how important it would be for you to step-up and volunteer to maintain them. It takes into account several factors, and starting from now, it also includes the test reports collected by the CPAN Testers.
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Code
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Fun
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Slides
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Moose
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Videos
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Advent
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Happy Advent!
Oylenshpeegul collected the list of Advent calendars: Go, Perl 5, Perl 6, Dancer, Futures, Sys, Java, Garage Rock.
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Semantic Perl
Perl and the Semantic web. Introducing RDF::Trine and RDF::Query
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Weekly collections
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Perl Maven Tutorial
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How to improve my Perl program?
It is especially for beginners, but even long time Perl users might find a few suggestions here. Certainly you could use this page to recommend your co-workers some basic things how to improve their Perl code.
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Events
I usually list the next 3-4 events here. The list of all the events can be found on the web site. If your Perl event is not listed there, please let me know.
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You know, you could get the Perl Weekly right in your mailbox. Every Week. Free of charge!
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Hi investors, Dan (@tradealert) and Dean (@deanliu) are back and today we’re looking at an intriguing project called Celsius.
In a Nutshell.
Celsius is a decentralized lending and borrowing platform built on the Ethereum blockchain and powered by its own native currency: the CEL token.
The basic idea behind Celsius is to allow retail users to deposit coins in wallets provided on the platform to gain access to two major services:
- at launch users will be able to apply for dollar loans (at discounted interest) with cryptocurrencies as collateral;
- in the future users will be able to lend cryptocurrencies to short traders in order to gain interest (up to 9%/tx annually) paid in CEL tokens;
In that regard, the project is somewhat similar to other crypto lending platform such as SALT and aims at competing against banks and credit institutions to provide banking services to the “unbanked” and the “badly-banked”
The other, less glamour purpose of the project is to provide liquidity for institutional traders to short the crypto market. In this podcast, Alex Mashinsky, the CEO of Celsius admits that large crypto exchanges commonly lend their users’ funds to large institutional traders (hedge funds, ETFs,etc.) for a fee. These institutions then use those funds to short crypto either to manipulate the price or to hedge their positions in a bear market.
Celsius aims at taking advantage of this dynamic by offering a deal that would benefits wallet users by re-distributing lending fees to them.
It’s a neat idea which, if the platform proves successful, could give birth to a brand new class of derivatives.
The project is doing a pre-sale on March 15.
I- The good.
The project has a great team (a), a functional working product (b) and is rumored to already have a partnership with a financial institution (c).
a-The Team.
The project is headed by Alex Mashinsky, an israelo-american entrepreneur and inventor with a proven track record of successful business ventures.
Here’s Alex talking about the project on the Hidden Forces podcast:
https://www.youtube.com/watch?v=YImrcZKqtLU
Most importantly, the Chief Technology Officer of the project, Syed Fazli, is a Bloomberg lead engineer with plenty of experience in leading large scales projects.
Overall, the team looks plenty capable of dealing with the technical aspects of the project.
b-A Working Product.
The project already offers a working product for Android which we recommend you download from Google’s Play Store and try out yourself.
We hope that in the future Celsius will also release a desktop application so to allow users to manage their funds directly from the comfort of their computer.
c- The Rumor.
It is rumored that the project has already concluded an important partnership with “a financial institution“ to provide liquidity to their platform but our inquiries about this fell on deaf ears.
If true, a large partnership would certainly give the project an edge over other blockchain platforms offering the same service like SALT.
The Risks.
Going through the whitepaper, we found a few problems with the project.
First and foremost, the project seems to assume that institutional traders will simply flock to the platform to borrow crypto assets without providing actual evidence that Celsius possess a competitive edge over traditional, more liquid solutions for shorting like the CME futures for example.
Second, as with most Ethereum-based projects, we believe that Celsius does not fundamentally need a token to power its platform and, despite the teams’ efforts to justify its existence…
…it remains to be seen:
- how the token’s volatility will impact the economy of the platform;
- how the token will impact the overall user experience.
Third, there is some concern regarding the custody of the funds that will be deposited in Celsius wallets. Obviously Celsius does not exercise custody of the funds directly in the wallets (a third party custodian will control the funds in cold storage wallets), however the centralization of deposited assets with a single entity creates a single point of failure and could potentially expose the funds to hacks.
Finally, it must be pointed out that if the broader crypto market continues on its bear trajectory, there is a real chance that investing in ICOs will result in a loss of money.
Overall though, the project is still worth a look and possibly a (small) investment although we recommend you manage your position carefully.
If you’d like to know more about the project we recommend you read their whitepaper, visit the Celsius website and Telegram channel.
So readers, what do you think about this project?
That’s it for today and we sure hope you’ve learned something new. Don’t forget to re-steem, upvote and follow @tradealert and @deanliu if you like our featured content.
Cheers,
Dan & Dean.
This page is synchronized from the post: ‘Celsius - Decentralized Lending & Borrowing Platform’


Welcome! I hope you have a lovely time looking through my portfolio!
Howdy! I'm Tom!
I am a Software Engineer from Southampton in the UK, currently based in Bath
I have a background in Science and Research, with a PhD in Biochemistry and Structural Biology,
specialising in Mass Spectrometry, Molecular Biology and Environmental Chemistry
Upon completing the Mayden Academy Full Stack Track, I will be proficient in:
React
Node.js
.NET
HTML
CSS
mySQL
I like Music (I play the Guitar and Bass.......and the Trombone very badly!), Rocket League (and other video games) and am an Entry-Level Fantasy Fiction Enthusiast
I CAN TELL YOUR MORE! or at least give you the link to where you can see it for yourself..... Click here for Mayden Academy Logo
The Mayden Academy re-created logo using purely HTML and CSS!
I CAN TELL YOUR MORE! or at least give you the link to where you can see it for yourself..... Click here for Blackjack(ish)
A php project that generates and deals cards and decides who wins!
I CAN TELL YOUR MORE! or at least give you the link to where you can see it for yourself..... Click here for Guitar Collection Database
Created an app for storing, displaying and updating a guitar collection!
I CAN TELL YOUR MORE! or at least give you the link to where you can see it for yourself..... Click here for Post and Rails Calulator
A simple calculator for building fences!
I CAN TELL YOUR MORE! or at least give you the link to where you can see it for yourself..... Click here for Who's a Good Puppy?
A simple JS game - avoid the brushes and complete the maze!
I CAN TELL YOUR MORE! or at least give you the link to where you can see it for yourself..... Click here for Top Cat
Pulls a collection of cats from an API and let's you pick your favourite!
I CAN TELL YOUR MORE! or at least give you the link to where you can see it for yourself..... Click here for Mayden Academy Aptitude Test
An app to test applicants to the Mayden Academy!
I CAN TELL YOUR MORE! or at least give you the link to where you can see it for yourself..... Click here for the To-Do List
A php API and JS front-end to track your tasks!
I CAN TELL YOUR MORE! or at least give you the link to where you can see it for yourself..... Click here for Rocket-League Stats
A Php (Slim) API for retreiving Player, Team and Season stats for the RLCS!
I CAN TELL YOUR MORE! or at least give you the link to where you can see it for yourself..... Click here for Mayden Academy Portal
a Php (Slim) API and JS front-end for managing admin controls of the Mayden Academy!


--- layout: archive title: Zulip Chat Archive permalink: /stream/116395-maths/topic/euclidean.20domains.html ---
Currently, the definition of a Euclidean domain has the field
(val_remainder_lt : ∀ a {b}, b ≠ 0 → valuation (remainder a b) < valuation b)
I think it should read
(val_remainder_lt : ∀ a {b}, b ≠ 0 → (remainder a b = 0 ∨ valuation (remainder a b) < valuation b))
or something like that. What is best in these cases:
(i) the change as I suggest, or
(ii) move the claim remainder a b = 0
to a condition, so b \ne 0 \and remainder a b \ne 0 \to ...
My plan when I wrote polynomials, was that it should take a well founded relation instead of a valuation. mod_lt
would be r (remainder a b) b
and val_me_mul_left
would be not r (a * b) a
I think. degree
now returns with_bot nat
so it meets this definition.
The trouble with your definition is it makes every proof and definition longer. For example gcd needs an extra else if
.
def gcd : α → α → α | a := λ b, if a0 : a = 0 then b else if hba : remainder b a = 0 then a else have h:_ := or.resolve_left (val_mod_lt' b a0) hba, gcd (b%a) a using_well_founded {rel_tac := λ _ _, `[exact ⟨_, measure_wf valuation⟩]}
On the other hand, it is the definition that every mathematician is used to...
@Chris Hughes Do you think the valuation
of an ED should also take values in with_bot nat
? And then require that valuation a = bot \iff a = 0
?
That might be also be an idea, but without valuation a = bot \iff a = 0
, because that will be annoying with integers.
But even so, I think arbitrary well founded is better, because then people dealing with integers can use the relation x.nat_abs < y.nat_abs
where the use of with_bot
would just be annoying.
So, what do you suggest as definition of ED?
Then we can try to use that, and also prove that it is equivalent to the "usual" definition. And possibly build a 2nd constructor that mimics the "usual" one.
I just made a PR with my suggested solution. https://github.com/leanprover/mathlib/pull/211
Nice! I like your speed!
Cool, you add an instance for int
!
Last updated: Apr 24 2020 at 19:02 UTC


Operating Systems
Operating systems are used for both running your computer, and running web servers. Whilst you are not going to base your laptop buying decision based on which PHP version it has by default, knowing what versions are on what operating systems can save you some trouble in the future.
More importantly, picking an OS for your web server with the right version is going to save arsing around trying to install (sometimes unofficial) repos to get it up to date.
| Distribution | Family | Default |
|---|---|---|
| Debian 8 (Jessie) | linux | 5.6.17+dfsg-0+deb8u1 |
| Ubuntu 15.10 (Wily) | linux | 5.6.11+dfsg-1ubuntu3.1 |
| Ubuntu 15.04 (Vivid) | linux | 5.6.4+dfsg-4ubuntu6.4 |
| OSX 10.11 (El Capitan) | osx | 5.5.29 |
| Ubuntu 14.04 LTS (Trusty) | linux | 5.5.9+dfsg-1ubuntu4.14 |
| OSX 10.10 (Yosemite) | osx | 5.5.9 |
| Debian 7 (Wheezy) | linux | 5.4.45-0+deb7u2 |
| OSX 10.9 (Mavericks) | osx | 5.4.17 |
| Red Hat Enterprise Linux (RHEL) 7.1 | linux | 5.4.16 |
| CentOS 7 | linux | 5.4.16 |
| Ubuntu 12.04 LTS (Precise) | linux | 5.3.10-1ubuntu3.21 |
| OSX 10.8 (Mountain Lion) | osx | 5.3.10 |
| Red Hat Enterprise Linux (RHEL) 6.7 | linux | 5.3.3 |
| Debian 6 (Squeeze) | linux | 5.3.3-7+squeeze19 |
| CentOS 6 | linux | 5.3.3 |
| CentOS 5 | linux | 5.1.6 |


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Hi i'm Jetsada
My fullname is Mr.Jetsada   Prasitsuwan you can call me Ice. I was born on 19 September 1995 Prachinburi but now i study in Bangkok. In my freetime i like to play Games , Guitar , play sport(sometime). If you need to know me more you can click link below.


| Top |
| GDBusServer * | g_dbus_server_new_sync () |
| void | g_dbus_server_start () |
| void | g_dbus_server_stop () |
| gboolean | g_dbus_server_is_active () |
| const gchar * | g_dbus_server_get_guid () |
| GDBusServerFlags | g_dbus_server_get_flags () |
| const gchar * | g_dbus_server_get_client_address () |
| gboolean | active | Read |
| gchar * | address | Read / Write / Construct Only |
| GDBusAuthObserver * | authentication-observer | Read / Write / Construct Only |
| gchar * | client-address | Read |
| GDBusServerFlags | flags | Read / Write / Construct Only |
| gchar * | guid | Read / Write / Construct Only |
GDBusServer is a helper for listening to and accepting D-Bus connections. This can be used to create a new D-Bus server, allowing two peers to use the D-Bus protocol for their own specialized communication. A server instance provided in this way will not perform message routing or implement the org.freedesktop.DBus interface.
To just export an object on a well-known name on a message bus, such as the
session or system bus, you should instead use g_bus_own_name()
.
An example of peer-to-peer communication with G-DBus can be found in gdbus-example-peer.c.
GDBusServer * g_dbus_server_new_sync (const gchar *address
,GDBusServerFlags flags
,const gchar *guid
,GDBusAuthObserver *observer
,GCancellable *cancellable
,GError **error
);
Creates a new D-Bus server that listens on the first address in
address
that works.
Once constructed, you can use g_dbus_server_get_client_address()
to
get a D-Bus address string that clients can use to connect.
Connect to the “new-connection” signal to handle incoming connections.
The returned GDBusServer isn't active - you have to start it with
g_dbus_server_start()
.
GDBusServer is used in this example.
This is a synchronous failable constructor. See
g_dbus_server_new()
for the asynchronous version.
address |
A D-Bus address. |
|
flags |
Flags from the GDBusServerFlags enumeration. |
|
guid |
A D-Bus GUID. |
|
observer |
A GDBusAuthObserver or |
[allow-none] |
cancellable |
A GCancellable or |
[allow-none] |
error |
Return location for server or |
Since 2.26
gboolean
g_dbus_server_is_active (GDBusServer *server
);
Gets whether server
is active.
Since 2.26
const gchar *
g_dbus_server_get_guid (GDBusServer *server
);
Gets the GUID for server
.
Since 2.26
GDBusServerFlags
g_dbus_server_get_flags (GDBusServer *server
);
Gets the flags for server
.
Since 2.26
const gchar *
g_dbus_server_get_client_address (GDBusServer *server
);
Gets a D-Bus address string that can be used by clients to connect
to server
.
Since 2.26
typedef struct _GDBusServer GDBusServer;
The GDBusServer structure contains only private data and should only be accessed using the provided API.
Since 2.26
Flags used when creating a GDBusServer.
|
No flags set. |
||
|
All “new-connection” signals will run in separated dedicated threads (see signal for details). |
||
|
Allow the anonymous authentication method. |
Since 2.26
“active”
property“active” gboolean
Whether the server is currently active.
Flags: Read
Default value: FALSE
Since 2.26
“address”
property“address” gchar *
The D-Bus address to listen on.
Flags: Read / Write / Construct Only
Default value: NULL
Since 2.26
“authentication-observer”
property“authentication-observer” GDBusAuthObserver *
A GDBusAuthObserver object to assist in the authentication process or NULL
.
Flags: Read / Write / Construct Only
Since 2.26
“client-address”
property“client-address” gchar *
The D-Bus address that clients can use.
Flags: Read
Default value: NULL
Since 2.26
“flags”
property“flags” GDBusServerFlags
Flags from the GDBusServerFlags enumeration.
Flags: Read / Write / Construct Only
Since 2.26
“guid”
property“guid” gchar *
The guid of the server.
Flags: Read / Write / Construct Only
Default value: NULL
Since 2.26
“new-connection”
signalgboolean user_function (GDBusServer *server, GDBusConnection *connection, gpointer user_data)
Emitted when a new authenticated connection has been made. Use
g_dbus_connection_get_peer_credentials()
to figure out what
identity (if any), was authenticated.
If you want to accept the connection, take a reference to the
connection
object and return TRUE
. When you are done with the
connection call g_dbus_connection_close()
and give up your
reference. Note that the other peer may disconnect at any time -
a typical thing to do when accepting a connection is to listen to
the “closed” signal.
If “flags” contains G_DBUS_SERVER_FLAGS_RUN_IN_THREAD
then the signal is emitted in a new thread dedicated to the
connection. Otherwise the signal is emitted in the
thread-default main context
of the thread that server
was constructed in.
You are guaranteed that signal handlers for this signal runs
before incoming messages on connection
are processed. This means
that it's suitable to call g_dbus_connection_register_object()
or
similar from the signal handler.
server |
The GDBusServer emitting the signal. |
|
connection |
A GDBusConnection for the new connection. |
|
user_data |
user data set when the signal handler was connected. |
Flags: Run Last
Since 2.26


Hello my name is Mohammed Hadi and I am an aspiring/Junior developer
striving to be the best that I can be as a programmer, I know its
going to be a bumpy road ahead but tell me something worth while that
comes easily. I relish the challenge ahead, I am willing to commit
myself, put my head down and give it my all to achieve the goals that
I have set out to do. I am confident in my abilities , just don't ask
me anything yet 😄... but watch the space !


Report occurrences where usages of "magic" constants only are allowed
but other expressions are used instead.
E.g.
new Font("Arial", 2 ) // not allowed
instead of new Font("Arial", Font. ITALIC ) // OK
Please see org.intellij.lang.annotations.MagicConstant
annotation description for details.


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Open Sunday thru Thursday 11a 8p Friday & Saturday 11a 9p urbanhotdogcompany.com. {. 505. } 89. 8. 56. 7. 1. The Shops at Cottonwood. 1 .
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How can New York City hot dog vendors afford to pay half a million ...
Aug 12, 2009 . A hot dog vendor was kicked from the curb outside New York City's . Some companies buy up the permits for dozens of carts and then lease .
http://www.slate.com/articles/news_and_politics/explainer/2009/08/the_halfmilliondollar_wiener.html -
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Hotdogs slathered with minced meat chili, ketchup, mustard and onions is the classic New York style. And with 10 million hot dogs consumed by New York alone .
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Man behind NYC's famous Sabrett hot dogs dies | Crain's New York ...
Nov 21, 2011 . Man behind NYC's famous Sabrett hot dogs dies . The Sabrett company got its name in 1926 when its two co-founders wanted to call it the .
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NY Vendor Hot Dogs | mrfood.com
There's nothing like a New York City hot dog topped with the onion sauce . And, with our recipe for NY Vendor Hot Dogs, you can enjoy those mouthwatering .
http://www.mrfood.com/Misc-Meat-Recipes/NY-Vendor-Hot-Dogs


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Chinese President Xi says need to bring down trade barriers
by ReutersSHANGHAI: Global trade barriers must be removed, and countries should uphold basic multilateral trade principles while standing firm against protectionism, Chinese President Xi Jinping said on Tuesday.
Speaking at the opening of the Nov 5-10 China International Import Expo, or CIIE, an annual import show in Shanghai, Xi said more must be done to boost international cooperation and remove barriers to innovation.
He reiterated broad pledges to continue to open China’s economy and markets and strengthen the protection of intellectual property rights.
The remarks come as US and Chinese negotiators work to finalise a text of a “phase one” agreement for US President Donald Trump and Xi to sign this month to ease the nearly 16-month trade war that has dented the global economy.
“There is no single country that can resolve by itself the difficulties facing the development of the world’s economy,” Xi said in a speech.
“We need to join hands with each other instead of letting go of each other’s hands. We need to tear down walls, not to erect walls. We need to stand firm against protectionism and unilateralism. We need to continually bring down trade barriers, optimise global value and supply chains and jointly foster market demand,” he said.
China launched the import expo last year as the China-US trade war was heating up.
Critics say the week-long Chinese buying spree once a year does little to address structural concerns, including weak intellectual property protection, entry barriers and the lack of a level playing field for foreign businesses in China.
French President Emmanuel Macron, attending the expo, called on China to “consolidate” the opening up of its market.
“Much has been done in recent years with two revisions of the negative lists for foreign investment … important tariff reductions have been granted. We call for their consolidation and deepening,” Macron said in remarks that followed Xi’s.
“We need a greater openness of China and its domestic market,” he said, citing the agri-food sector.
“All French, German and European companies expect a lot of China’s promises here.”
‘We will deliver’
Foreign governments and business groups have become skeptical of Chinese reform promises and have longed warned that China would invite retaliation if it didn’t match the openness of its trading partners.
On Tuesday, Xi listed a handful of measures that he said China had taken since last year’s CIIE to open its markets and took direct aim at criticism.
“This shows that we do honour our commitments,” he said. “And we will deliver on what we have promised.”
China would continue to push its strategy of innovation-driven growth, and foster new engines of growth, Xi said.
“China will throw open its arms, and provide more market opportunities, investment opportunities and growth opportunities for countries in the world, so we can share the growth together.”
Last year, more than 3,600 companies attended CIIE, agreeing to some $57.8 billion in deals.
The expo comes at a rocky time for the Chinese economy with domestic demand stubbornly weak, despite more than a year of growth-boosting measures.
“China will better leverage the fundamental role of consumption, actively construct a more proactive domestic market to help provide support for Chinese economic development and expand the global economic growth,” Xi said.
Imports dropped 8.5% in September after a decline of 5.6% in August.
China’s third-quarter economic growth slowed more than expected to its weakest pace in almost three decades, with the gross domestic product (GDP) rising just 6.0% year-on-year.


File Shares are detected when you import a Gluster cluster.
If no File Shares are detected after importing a Gluster cluster, reconfigure the File Shares correctly.


---
layout: post
title: 'Ionic + Electron: Sneak Peek at my Upcoming Pluralsight Course'
date: '2017-07-13T17:01:00.001-04:00'
author: Michael D. Callaghan
tags:
modified_time: '2017-07-13T17:42:29.313-04:00'
thumbnail: https://i.ytimg.com/vi/J1G8-AwH5CE/default.jpg
comments: true
---
Does it feel as though everyone is doing web
development these days? Where I work, every new app is a web app. But sometimes, an application has to run on the
desktop and interact with the host OS. In such cases, it seems foolish to ignore all of those web development
skills. Now, you don’t have to.
In this course, we are going use our web development skills:
HTML, JavaScript, and TypeScript, to build a cross-platform desktop app that will run on both MacOS and Windows.
Some of the major topics that we will cover
include:
Building the UI with the Ionic Framework, showcasing that Ionic isn’t just about
mobile development anymore.
Using Electron to host the Ionic code inside of a native application shell.
Interacting with the desktop OS to display icons and menus, loading files, and
responding to user menu selections.
Building installers appropriate for either platform, and creating public releases
from those installers.
Implementing auto-updates, so that the users only have to install the app once.
By the end this course, you’ll see just how simple it can be to
build a real-world, functioning cross-platform app with Electron and Ionic.
Before beginning the course you should be familiar with the
basics of web development using HTML5, JavaScript, TypeScript, and Angular. It will help if you have already done a
few of the Ionic tutorials.
I hope you'll take a look at my course. Expected release in July
2017.


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CRONOS A film review by<EMAIL_ADDRESS>Copyright 1994<EMAIL_ADDRESS>CRONOS Guillermo del Toro Mexico, 1993 Genre: horror/comedy Winner of the Critics Week, Cannes Film Festival, 1993 Also presented at New York's Museum of Art, Film & Video 23rd Fest.
Two words: good entertainment.
Perhaps insects are God's favorite creatures, after all. Mosquitoes can walk on water, resuscitation is common amongst some species, some can live for centuries trapped inside rocks, etc.
CRONOS takes its name from a device made in the 1500s by an alchemist, a device that can make someone eternal. Inside this device we find gears of all sorts and also what looks like an insect larvae that filters a certain amount of blood pumped by the device. The device was entrapped in the base of a statue at one point, and was discovered by an antique dealer in our present times, who have no idea what it is about but of course, will soon find out. The device comes with an instruction booklet although this booklet found its way to a rich dying man who deciphered it and knows what the device is about, sending his gorilla-like son to hunt antique shops trying to find the statue.
CRONOS is at times a black comedy, at times serious. When we get a peek inside the device it reminds a graphic imagery from DELICATESSEN or Gilliam's BRAZIL. The general ambiance is on the light side, although a serious under-current goes through. The grand-father (the antique dealer) and daughter team makes for an original bunch. The rich (as in 'stinkin' rich') man is what we expect him to be, living in sanitized quarters and served by his son who looks like your typical small-minded gorilla, always worried about the shape of his nose at that.
You may remember some "Twilight Zone" episodes where there was both suspense/ horror and a touch of humour. CRONOS is in the same vein. Although some people may not like it because it is not blatantly straight-forward, it is still good entertainment value. It may also remind some people of early Cronenberg movies.
The print shown here in Montreal was in Spanish/with sparse spoken English and English sub-titles.
Alain<EMAIL_ADDRESS>.
The review above was posted to the
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