C99
Macros with variadic args:
Let's say you want to create some print-macro for debugging your code, let's take this macro as an example:
#define debug_print(msg) printf("%s:%d %s", __FILE__, __LINE__, msg)
Some examples of usage:
The function somefunc() returns -1 if failed and 0 ...
To concatenate the value of two or more variables into a single string and print it as the output, we need to make use of interpolation.
The following Less code,
#demo:after {
@var1: Hello;
@var2: World!!!;
content: "@{var1} @{var2}";
}
when compiled would set "Hello Wo...
Native Canvas API does not have a method to wrap text onto the next line when a desired maximum width is reached. This example wraps text into paragraphs.
function wrapText(text, x, y, maxWidth, fontSize, fontFace){
var firstY=y;
var words = text.split(' ');
var line = '';
var lineHeigh...
This example draws text paragraphs into any portions of the canvas that have opaque pixels.
It works by finding the next block of opaque pixels that is large enough to contain the next specified word and filling that block with the specified word.
The opaque pixels can come from any source: Path d...
View loading
In a test for a view controller you want sometimes to trigger the execution of loadView() or viewDidLoad(). This can be done by accessing the view. Let's say you have view controller instance in your test called sut (system under test), then the code would look like this:
XCTAssertNot...
This creates a variant (a tagged union) that can store either an int or a string.
std::variant< int, std::string > var;
We can store one of either type in it:
var = "hello"s;
And we can access the contents via std::visit:
// Prints "hello\n":
visit( [](auto&&a...
To make a jar, you need one or more class files. This should have a main method if it is to be run by a double click.
For this example, we will use:
import javax.swing.*;
import java.awt.Container;
public class HelloWorld {
public static void main(String[] args) {
JFrame f = ne...
In R, data objects are manipulated using named data structures. The names of the objects might be called "variables" although that term does not have a specific meaning in the official R documentation. R names are case sensitive and may contain alphanumeric characters(a-z,A-z,0-9), the dot...
5.6
PHP 5.6 introduced variable-length argument lists (a.k.a. varargs, variadic arguments), using the ... token before the argument name to indicate that the parameter is variadic, i.e. it is an array including all supplied parameters from that one onward.
function variadic_func($nonVariadic, ...$...
#include <stdio.h>
#define SIZE (10)
int main()
{
size_t i = 0;
int *p = NULL;
int a[SIZE];
/* Setting up the values to be i*i */
for(i = 0; i < SIZE; ++i)
{
a[i] = i * i;
}
/* Reading the values using pointers */
for(p =...
You can store the signing information setting environment variables.
These values can be accessed with System.getenv("<VAR-NAME>")
In your build.gradle you can define:
signingConfigs {
release {
storeFile file(System.getenv("KEYSTORE"))
storePasswo...
You define a keyword argument in a method by specifying the name in the method definition:
def say(message: "Hello World")
puts message
end
say
# => "Hello World"
say message: "Today is Monday"
# => "Today is Monday"
You can define multip...
2.1
Required keyword arguments were introduced in Ruby 2.1, as an improvement to keyword arguments.
To define a keyword argument as required, simply declare the argument without a default value.
def say(message:)
puts message
end
say
# => ArgumentError: missing keyword: message
say ...
You can define a method to accept an arbitrary number of keyword arguments using the double splat (**) operator:
def say(**args)
puts args
end
say foo: "1", bar: "2"
# {:foo=>"1", :bar=>"2"}
The arguments are captured in a Hash. You can manip...
Unlike a parallel for-loop (parfor), which takes the iterations of a loop and distributes them among multiple threads, a single program, multiple data (spmd) statement takes a series of commands and distributes them to all the threads, so that each thread performs the command and stores the results....
Given a DataFrame with MultiIndex columns
# build an example DataFrame
midx = pd.MultiIndex(levels=[['zero', 'one'], ['x','y']], labels=[[1,1,0,],[1,0,1,]])
df = pd.DataFrame(np.random.randn(2,3), columns=midx)
In [2]: df
Out[2]:
one zero
y x ...
Start with a standard DataFrame
df = pd.DataFrame(np.random.randn(2,3), columns=['a','b','c'])
In [91]: df
Out[91]:
a b c
0 -0.911752 -1.405419 -0.978419
1 0.603888 -1.187064 -0.035883
Now to change to MultiIndex, create a MultiIndex object and assign it to df....
Dependencies can be added for specific product flavors in a similar fashion as build configurations.
android {
...
productFlavors {
flavor1 {
//...
}
flavor2 {
//...
}
}
}
dependencies {
flavor1Compile 'com.and...
You can use the archivesBaseName to set the name of apk.
For example:
defaultConfig {
....
project.ext.set("archivesBaseName", "MyName-" + defaultConfig.versionName);
}
You will obtain this output.
MyName-X.X.X-release.apk
