Imagine a goroutine with a two step process, where the main thread needs to do some work between each step:
func main() {
ch := make(chan struct{})
go func() {
// Wait for main thread's signal to begin step one
<-ch
// Perform work
time.Sle...
This example shows a simple image cropping function that takes an image and cropping coordinates and returns the cropped image.
function cropImage(image, croppingCoords) {
var cc = croppingCoords;
var workCan = document.createElement("canvas"); // create a canvas
workCan.wi...
When you document your code with @doc, you can supply code examples like so:
# myproject/lib/my_module.exs
defmodule MyModule do
@doc """
Given a number, returns `true` if the number is even, otherwise `false`.
## Example
iex> MyModule.even?(2)
true
ie...
The code listing below attempts to classify handwritten digits from the MNIST dataset. The digits look like this:
The code will preprocess these digits, converting each image into a 2D array of 0s and 1s, and then use this data to train a neural network with upto 97% accuracy (50 epochs).
"...
C++11
In C++11, compilers are required to implicitly move from a local variable that is being returned. Moreover, most compilers can perform copy elision in many cases and elide the move altogether. As a result of this, returning large objects that can be moved cheaply no longer requires special ha...
Let's have a basic failing program:
#include <iostream>
void fail() {
int *p1;
int *p2(NULL);
int *p3 = p1;
if (p3) {
std::cout << *p3 << std::endl;
}
}
int main() {
fail();
}
Build it (add -g to include debug info):
g++ -g -o m...
Initializing std::array<T, N>, where T is a scalar type and N is the number of elements of type T
If T is a scalar type, std::array can be initialized in the following ways:
// 1) Using aggregate-initialization
std::array<int, 3> a{ 0, 1, 2 };
// or equivalently
std::array<int, 3...
This example has been lifted from the Q & A section here:http://stackoverflow.com/a/1008289/3807729
See this article for a simple design for a lazy evaluated with guaranteed destruction singleton:
Can any one provide me a sample of Singleton in c++?
The classic lazy evaluated and correctly de...
Type check: variable.isInstanceOf[Type]
With pattern matching (not so useful in this form):
variable match {
case _: Type => true
case _ => false
}
Both isInstanceOf and pattern matching are checking only the object's type, not its generic parameter (no type reification), except fo...
Let's say we need to add a button for each piece of loadedData array (for instance, each button should be a slider showing the data; for the sake of simplicity, we'll just alert a message). One may try something like this:
for(var i = 0; i < loadedData.length; i++)
jQuery("#container&q...
Bad Example:
var location = dbContext.Location
.Where(l => l.Location.ID == location_ID)
.SingleOrDefault();
return location;
Since the above code is simply returning an entity without modifying or adding it, we can avoid tracking cost.
Good Ex...
One problem often seen in code is loading all the data. This will greatly increase the load on the server.
Let's say I have a model called "location" that has 10 fields in it, but not all the fields are required at the same time. Let's say I only want the 'LocationName' parameter of that...
Let's take an example of a function which receives two arguments and returns a value indicating their sum:
def two_sum(a, b):
return a + b
By looking at this code, one can not safely and without doubt indicate the type of the arguments for function two_sum. It works both when supplied with ...
The .info file is a static text file for defining and configuring a theme. Each line in the .info file is a key-value pair with the key on the left and the value on the right, with an "equals sign" between them (e.g. name = my_theme).
Semicolons are used to comment out a line. Some keys u...
Django comes with a number of builtin management commands, using python manage.py [command] or, when manage.py has +x (executable) rights simply ./manage.py [command] .
The following are some of the most frequently used:
Get a list of all available commands
./manage.py help
Run your Django ser...
