【原创】（学习笔记）静态常量成员变量的初始化

/*

主题：静态常量成员变量的初始化：

书名：<<The C++ Standard Library -A Tutorial and Reference>>

P25 (2.2.8 Initialization of Contants Static Members)

*******************************************************************

It is now possible to initialize integral constant static members inside the class structure.

This is useful when the constants is used in the class structure after the initialization.

(对于当这个常量会在初始化后要使用的情况，这样做会比较有效)

For example ===>

class MyClass{

static const int NUM = 100;

int elements[NUM];

...

};

Note that you still have to to define space for a constant static member that is initialized within a class definition:

const int MyClass::NUM; //no initialization here

*/

#pragma warning(disable:4530)

#include <iostream>

using namespace std;

class A

{

public:

A(){

for(int i=0; i<SIZE; i++)

num[i] = i;

}

void print(){

for(int i=0; i<SIZE; i++)

cout<<num[i]<<" "<<endl;

}

private:

static const SIZE = 10;

//注意：由于SIZE作为一个const常量，所以必须在首次定义的时候就给它赋值。

int num[SIZE];

};

const int A::SIZE;

//注意：由于SIZE作为一个类的静态成员，应该在类体外部定义（以取得和全局变量类似的效用）

int main()

{

A a;

a.print();

return 0;

}