STLSourceCodeNote/1_STL_introduction/1_9_1_config3.cpp at master · pythonkd/STLSourceCodeNote

39 lines (30 loc) · 1.12 KB

// file: 1config3.cpp

// 测试在 class template中拥有 static data members.

// test __STL_STATIC_TEMPLATE_MEMBER_BUG, defined in <stl_config.h>

// ref. C++ Primer 3/e, p.839

// vc6[o] cb4[x] gcc[o]

// cb4 does not support static data member initialization.

// 如果编译器无法处理static member of template classes(模板类静态成员)就定义。

// 即对于模板类中，模板类型不同时的静态变量不同。

#include <iostream>

using namespace std;

template <typename T>

class TestClass {

public:

static int _data;

};

// 需要加上template<>，否则编译出错，进行内存配置

template<> int TestClass<int>::_data = 1;

template<> int TestClass<char>::_data = 1;

int main() {

cout << TestClass<int>::_data << endl;

cout << TestClass<char>::_data << endl;

TestClass<int> obji1, obji2;

TestClass<char> objc1, objc2;

cout << obji1._data << " " << obji2._data << endl;

cout << objc1._data << " " << objc2._data << endl;

obji1._data = 3;

objc2._data = 4;

cout << obji1._data << " " << obji2._data << endl;

cout << objc1._data << " " << objc2._data << endl;

}

Provide feedback