Tutorial by Examples: er

If a using-declaration occurs at class scope, it is only allowed to redeclare a member of a base class. For example, using std::cout is not allowed at class scope. Often, the name redeclared is one that would otherwise be hidden. For example, in the below code, d1.foo only refers to Derived1::foo(c...

C++11 As a special case, a using-declaration at class scope can refer to the constructors of a direct base class. Those constructors are then inherited by the derived class and can be used to initialize the derived class. struct Base { Base(int x, const char* s); }; struct Derived1 : Base {...

PyTesseract is an in-development python package for OCR. Using PyTesseract is pretty easy: try: import Image except ImportError: from PIL import Image import pytesseract #Basic OCR print(pytesseract.image_to_string(Image.open('test.png'))) #In French print(pyt...

public abstract class BaseActivity extends AppCompatActivity { private Map<Integer, PermissionCallback> permissionCallbackMap = new HashMap<>(); @Override protected void onStart() { super.onStart(); ... } @Override public void setConten...

var fs = require("fs"); fs.readFileSync(‘abc.txt’,function(err,data){ //Reading File Synchronously if(!err) { console.log(data); } //else //console.log(err); }); console.log("something else"); Here, the program wa...

It is basically address of a variable in memory. It allows us to indirectly access a variable. So using pointers we can talk about a variable's address(as well as its value by dereferencing the pointer). They are useful when we want to deal with address of a memory location rather than its value. C...

Sometimes you may want to have some login to determine where the user gets redirected to after submitting a form. Form Requests give a variety of ways. By default there are 3 variables declared in the Request $redirect, $redirectRoute and $redirectAction. On top of those 3 variables you can overr...

The minimum required files and folders for the phonegap-build project are: ─ www ├─ res │ ├─ icon │ │ ├─ android │ │ ├─ ios │ │ ├─ windows-phone │ │ &...

When you're ready to upload your project to the phonegap-build service, zip the content of the www folder and upload the zip file to the phonegap-build service. It is recommended to only zip the content of the www folder, and not the www folder itself. However, this is just a recommendation and zip...

Following is the example of QLabel that displays use of texts,images and hyperlinks. import sys from PyQt4.QtCore import * from PyQt4.QtGui import * def window(): app = QApplication(sys.argv) win = QWidget() l1 = QLabel() l2 = QLabel() l3 = QLabel() l4 = QLabel()...

Vertical Index Match =INDEX(A1:A3,MATCH(E2,C1:C3,0))

Ext.define('App.Duck', { extend: 'Ext.Component', alias: 'widget.duck', initComponent: function () { this.callParent(arguments); this._quack(); }, _quack: function () { console.log('The duck says "Quack!"'); this.fireEvent('quack...

// gets the Class objects from the net.mminecraft.server package with the given name public Class<?> getNmsClass(String name) throws ClassNotFoundException { // explode the Server interface implementation's package name into its components String[] packageArray = Bukkit.getServer()....

Parameters can be marked as optional by giving them a default value. Optional parameters can be omitted when calling the function. string greet (string name, string language = "English") { if (language == "English") { return @"Hello, $name!"; } else ...

Value types (structures and enumerations) are passed by value to functions: a copy will be given to the function, not a reference to the variable. So the following function won't do anything. void add_three (int x) { x += 3; } int a = 39; add_three (a); assert (a == 39); // a is still 39...

This is an official MATLAB example Consider the following code: month = [1;1;2;3;8;1;3;4;9;11;9;12;3;4;11]; temperature = [57;61;60;62;45;59;64;66;40;56;38;65;61;64;55]; maxTemp = accumarray(month,temperature,[],@max); The image below demonstrates the computation process done by accumarray in...

Generic subprograms are usefull to create a subprograms that have the same structure for several types. For example, to swap two objects: generic type A_Type is private; procedure Swap (Left, Right : in out A_Type) is Temp : A_Type := Left; begin Left := Right; Right := Temp; ...

In Ada generic package, upon instantiation, data are duplicated; that is, if they contain global variables, each instance will have its own copy of the variable, properly typed and independent from the others. generic type T is private; package Gen is type C is tagged record V :...

Ada offers a wide variety of generic parameters which is difficult to translate into other languages. The parameters used during instantiation and as a consequence those on which the generic unit may rely on may be variables, types, subprograms, or package instances, with certain properties. For exa...

These exceptions are caused when the type of some object should be different TypeError: [definition/method] takes ? positional arguments but ? was given A function or method was called with more (or less) arguments than the ones it can accept. Example If more arguments are given: def foo(a): re...