In C++, a static member function of a class cannot be virtual. For example, below program gives compilation error. 1 #include<iostream> 2 using namespace std; 3 4 class Test 5 { 6 public: 7 // Error: Virtual member functions cannot be static 8 virtu…

extern static const abstract virtual const const.常量,初始化过后值不能再变化的变量.…

log.info "starting" // we use class to create objects of a class Planet p1 = new Planet() Planet p2 = new Planet() //Planet.name = "Pluto" illegal Planet.shape = "Circle" // static variable Planet.log = log p1.name = "ea…

class A { static void fun() { System.out.println("A.fun()"); } } class B extends A { static void fun() { System.out.println("B.fun()"); } } public class Main { public static void main(String[] args) { A a = new B(); a.fun(); } } A.fun(…

Functions function is a concept for C programming language, objective-c is entirely relies on C. To define a function, you need provide four components: return value, function name, parameters and code block. like this: 1 2 3 int getRandomInteger(int…

static对象如果出现在类中,那么该对象即使从未被使用到,它也会被构造以及析构.而函数中的static对象,如果该函数从未被调用,这个对象也就绝不会诞生,但是在函数每次被调用时检查对象是否需要诞生. 下面详细说说static的功能以及它的来龙去脉: static作为编程语言里面一种重要的数据类型,它的地位在面试的过程里也是相当的高. 为什么要引入static 函数内部定义的变量,在程序执行到它的定义处时,编译器为它在栈上分配空间,大家知道,函数在栈上分配的空间在此函数执行结束时会释放掉,这样就…

4.4 指向Member Function的指针 (Pointer-to-Member Functions) 取一个nonstatic data member的地址,得到的结果是该member在 class 布局中的byte位置(再加1),它是一个不完整的值,须要被绑定于某个 class object的地址上,才可以被存取. 取一个nonstatic member function的地址,假设该函数是nonvirtual,则得到的结果是它在内存中真正的地址.然而这个值也是不全然的,它也须要被绑定…

Delphi之静态方法,虚方法virtual,动态dynamic,抽象abstract,消息 http://www.cnblogs.com/zhwx/archive/2012/08/28/2660555.html 对象的方法能定义成静态(static).虚拟(virtual).动态(dynamic)或消息处理(message).请看下面 的例子: TFoo = class procedure IAmAStatic; procedure IAmAVirtual; virtual; procedur…

C Static http://stackoverflow.com/questions/572547/what-does-static-mean-in-a-c-program Static could be used for (1) variable and (2) function. A static variable inside a function keeps its value between invocations.(functions call). A static global…

https://msdn.microsoft.com/en-us/library/9fkccyh4.aspx The virtual keyword is used to modify a method, property, indexer, or event declaration and allow for it to be overridden in a derived class. For example, this method can be overridden by any cla…