如何初始化类的static成员变量？
类的static成员变量不被某一个对象所独有，而是被所有同类型的对象所共有。
只能在头文件中声明类的static成员变量，不可在头文件中初始化，否则会造成重定义。必须在另外一个.cpp文件中进行初始化。并且，初始化的时候不可以有static修饰词。
frank@userver:~/project/test/static-test/static2_cpp$ cat static.h
#ifndef STATIC_H
#define STATIC_H
#include<iostream>
using std::cout;
using std::endl;
class TestType{
static int m_static;
public:
TestType(int dat = 0) {}
void Show()const{
cout << "this=" << this << ", ";
cout << "m_static:(" << &m_static << ", " << m_static << ")\n";
}
};
#endif // #ifndef STATIC_H
frank@userver:~/project/test/static-test/static2_cpp$ cat static.cpp
#include "static.h"
int TestType::m_static = 15;
frank@userver:~/project/test/static-test/static2_cpp$ cat test.h
#ifndef TEST_H
#define TEST_H
void test();
#endif // #ifndef TEST_H
frank@userver:~/project/test/static-test/static2_cpp$ cat test.cpp
#include "test.h"
#include "static.h"
void test(){
cout << __func__ << endl;
TestType obj(5);
obj.Show();
}
frank@userver:~/project/test/static-test/static2_cpp$ cat main.cpp
#include "static.h"
#include "test.h"
int main(){
cout << __func__ << endl;
TestType obj(4);
obj.Show();
test();
}
frank@userver:~/project/test/static-test/static2_cpp$ g++ main.cpp test.cpp static.cpp
frank@userver:~/project/test/static-test/static2_cpp$ ./a.out
main
this=0x7fff309db27f, m_static:(0x602078, 15)
test
this=0x7fff309db25f, m_static:(0x602078, 15)
frank@userver:~/project/test/static-test/static2_cpp$
本文转自FrankNie0101 51CTO博客，原文链接：http://blog.51cto.com/frankniefaquan/1936705，如需转载请自行联系原作者
