函数模板示例（一）

模板函数定义文件function1.h：

#ifndef FUNCTION1_H
#define FUNCTION1_H

#include <cstring>
#include <string>

template <typename T>
inline T const& max(T const&a , T const& b)
{
    return a < b ? b : a;
}

template <typename T>
inline T* const& max(T* const& a, T* const& b)
{
    return *a < *b ? b : a;
}

inline char const* const& max(char const* const& a, char const* const& b)
{
    return std::strcmp(a, b) < 0  ? b : a;
}

template <typename RT, typename T1, typename T2>
inline RT max(T1 const& a, T2 const&b)
{
    RT c = a < b ? (RT)b : (RT)a;
    return c;
}

#endif // FUNCTION1_H

测试文件main.h：

#include <iostream>
#include <cstdlib>
#include "function1.h"

int main()
{
    int a = 10;
    int b = 32;
    std::cout << ::max(a, b) << std::endl;

    std::string str1 = "hello";
    std::string str2 = "world";
    std::cout << ::max(str1, str2) << std::endl;

    int* p1 = &b;
    int* p2 = &a;
    std::cout << *::max(p1, p2) << std::endl;

    char const* s1 = "cat";
    char const* s2 = "hat";
    std::cout << ::max(s1, s2) << std::endl;

    return 0;
}

结果：