Tutorial by Examples: define

The XML document to consider in this example - <a> <b>test-value</b> <d>fragment-d</d> <c-root> <d>fragment-d</d> <e>fragment-e</e> </c-root> </a> A fragment root is declared on <c-r...

Very often it happens to deal with models which have something like a published field. Such kind of fields are almost always used when retrieving objects, so that you will find yourself to write something like: my_news = News.objects.filter(published=True) too many times. You can use custom mana...

You can also loop over a variable list. From vars: favorite_snacks: - hotdog - ice cream - chips and then the loop: - name: create directories for storing my snacks file: path=/etc/snacks/{{ item }} state=directory with_items: '{{ favorite_snacks }}' If you are using Ansible ...

It is possible to create more complex loops with dictionaries. From vars: packages: - present: tree - present: nmap - absent: apache2 then the loop: - name: manage packages package: name={{ item.value }} state={{ item.key }} with_items: '{{ packages }}' Or, if you don't like ...

#lang racket (define (sum-of-list l) (if (null? l) 0 (+ (car l) (sum-of-list (cdr l))))) (sum-of-list '(1 2 3 4 5)) ;; => 15

A generic class is a class who adapts to a later-given type so that the same functionality can be offered to different types. In this basic example a generic class is created. It has a sub who uses the generic type T. While programming this class, we don't know the type of T. In this case T has ...

There are four predefined markup extensions in XAML: x:Type supplies the Type object for the named type. This facility is used most frequently in styles and templates. <object property="{x:Type prefix:typeNameValue}" .../> x:Static produces static values. The values come from va...

If you have create .Net class that represents some user-defined type, compiled it into .dll, and imported it into SQL server as an assembly, you can create user-defined function that references this class: CREATE TYPE dbo.Point EXTERNAL NAME MyLibrary.[Name.Space.Point] You need to specify name...

malloc() often calls underlying operating system functions to obtain pages of memory. But there is nothing special about the function and it can be implemented in straight C by declaring a large static array and allocating from it (there is a slight difficulty in ensuring correct alignment, in pract...

Sometimes we want to use a where query on a a collection of records returned which is not ActiveRecord::Relation.Hence we get the above error as Where clause is know to ActiveRecord and not to Array. There is a precise solution for this by using Joins. EXAMPLE:- Suppose i need to find all user ...

To define an atom, use an ordinary def, but add an atom function before it, like so: (def counter (atom 0)) This creates an atom of value 0. Atoms can be of any type: (def foo (atom "Hello")) (def bar (atom ["W" "o" "r" "l" "d"])) ...

Despite you can write a binary number in C++14 like: int number =0b0001'0101; // ==21 here comes a famous example with a self-made implementation for binary numbers: Note: The whole template expanding program is running at compile time. template< char FIRST, char... REST > struct binary {...

The simplest and cleanest way to add an external configuration is through a separate Gradle file build.gradle apply from: './keystore.gradle' android{ signingConfigs { release { storeFile file(keystore.storeFile) storePassword keystore.storePassword ...

Open a raster that covers the globe and extract a subset of the raster. import gdal # Path to a tiff file covering the globe # http://visibleearth.nasa.gov/view.php?id=57752 tif_name = "/path_name/land_shallow_topo_21600.tif" # Open raster in read only mode ds = gdal.Open(tif_n...

tslint can extend an existing rule set and is shipped with the defaults tslint:recommended and tslint:latest. tslint:recommended is a stable, somewhat opinionated set of rules which we encourage for general TypeScript programming. This configuration follows semver, so it will not have breaking ch...

#import <Foundation/Foundation.h> int main() { NSLog(@"File :%s\n", __FILE__ ); NSLog(@"Date :%s\n", __DATE__ ); NSLog(@"Time :%s\n", __TIME__ ); NSLog(@"Line :%d\n", __LINE__ ); NSLog(@"ANSI :%d\n", __STDC__ ); ...

var setValue; var obj = {}; Object.defineProperty(obj, "objProperty", { get: function(){ return "a value"; }, set: function(value){ setValue = value; } });

Using named ranges allows you to describe the meaning of a cell(s) contents and use this defined name in place of an actual cell address. For example, formula =A5*B5 can be replaced with =Width*Height to make the formula much easier to read and understand. To define a new named range, select cell ...

You can pass parameters to the functions in tf.cond() using lambda and the code is as bellow. x = tf.placeholder(tf.float32) y = tf.placeholder(tf.float32) z = tf.placeholder(tf.float32) def fn1(a, b): return tf.mul(a, b) def fn2(a, b): return tf.add(a, b) pred = tf.placeholder(tf....

<RangeSeekBar android:id="@+id/barPrice" android:layout_width="fill_parent" android:layout_height="wrap_content" app:barHeight="0.2dp" app:barHeight2="4dp" app:increment="7" ...