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Pure virtual function with implementation
...lemented in a derived type that will be directly instantiated, however the base type can still define an implementation. A derived class can explicitly call the base class implementation (if access permissions allow it) by using a fully-scoped name (by calling A::f() in your example - if A::f() were...
Why do we need virtual functions in C++?
... you're assigning the subclassed object (Cat), the method being invoked is based on the pointer type (Animal) not the type of object it is point to. This is why you need "virtual".
– rexbelia
Feb 7 '16 at 4:08
...
C++静态和多态，亦敌亦友 - C/C++ - 清泛网 - 专注C/C++及内核技术
...遭遇静态函数
#include <iostream>
using namespace std;
class Base
{
public:
virtual void foo(void){ cout << "Base::foo()" << endl; }
};
class Derived : public Base
{
public:
void foo(void){ cout << "Derived::foo()" << endl; }
} ;
class DerivedAgain : public Derived
...
Inline SVG in CSS
...
Is there any compatibility difference between base64 encoded svg to non-base64? Base64 bloats my css file, I'm thinking in just use inline svgs..
– enapupe
Apr 15 '13 at 13:39
...
How to call a parent method from child class in javascript?
..., with some tests, you can use it like this, inside your method use : call_base(this, 'method_name', arguments);
It make use of quite recent ES functions, an compatibility with older browsers is not guarantee. Tested in IE11, FF29, CH35.
/**
* Call super method of the given object and method.
* ...
Failed to execute 'btoa' on 'Window': The string to be encoded contains characters outside of the La
...r in the title is thrown only in Google Chrome, according to my tests. I'm base64 encoding a big XML file so that it can be downloaded:
...
super() in Java
...program 2 proofs our first statement of super() in Java.
Program 1
class Base
{
int a = 100;
}
class Sup1 extends Base
{
int a = 200;
void Show()
{
System.out.println(a);
System.out.println(a);
}
public static void main(String[] args)
{
new Sup1...
How to hide one item in an Android Spinner
...pinner dropdown you need to pass the position of item which needs to hided based on criteria required.
I have achieved this in a use case of hiding the item which is selected from dropdown
public class CustomAdapter extends ArrayAdapter<String> {
private List<String> dates;
private int...
C++ “virtual” keyword for functions in derived classes. Is it necessary?
...Virtual functions
2 If a virtual member function vf is declared in a class Base and in a class Derived, derived directly or indirectly from Base, a member function vf with the same name, parameter-type-list (8.3.5), cv-qualification, and ref-qualifier (or absence of same) as Base::vf is declared, th...
Python class inherits object
... two styles of classes depending on the presence or absence of object as a base-class:
"classic" style classes: they don't have object as a base class:
>>> class ClassicSpam: # no base class
... pass
>>> ClassicSpam.__bases__
()
"new" style classes: they have, directly...