函数模板示例（三） 模板函数的特化与重载

function3.h中的代码：

#ifndef FUNCTION3_H
#define FUNCTION3_H

#include <string>
#include <cstring>
#include <iostream>

template <typename T>
T myMax(const T p1, const T p2)
{
    std::cout << "template default func" << std::endl;
    return p1 < p2 ? p2 : p1;
}

// the compiler will use 'template int func' as the specialization for 'template default func'
template <>
int myMax(int int1, int int2)
{
    std::cout << "template int func" << std::endl;
    return int1 < int2 ? int2 : int1;
}

// the compiler will use 'int func' as the instantiation for 'template default func'
// it has to be put after 'template int func'
int myMax(int int1, int int2)
{
    std::cout << "int func" << std::endl;
    return int1 < int2 ? int2 : int1;
}


#endif // FUNCTION3_H

测试代码main.cpp：

#include <iostream>
#include "function3.h"

using namespace std;

int main()
{
    cout << myMax(21.0, 31.0) << endl;
    cout << myMax(21, 31) << endl;
    cout << myMax<int>(21, 31) << endl;

    return 0;
}

结果：