qfedu-cpp-level/day6/template/t1.cpp

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// 函数模版
/*
template <class T>
函数返回值 函数名(T &n1, T &n2)
{
// 函数体
}
*/
#include <iostream>
#include <cstring>
#include <cstdlib>
using namespace std;
namespace my
{
// 推荐使用 typename 而不是 class因为 typename 更通用
template <typename T>
void swap(T &a, T &b)
{
a ^= b;
b ^= a;
a ^= b;
}
// 函数模版重载: 用于不同类型的参数
template <typename T1, typename T2>
void swap(T1 &a, T2 &b)
{
a ^= b;
b ^= a;
a ^= b;
}
}
int main()
{
int a = 2, b = 6;
cout << a << ", " << b << endl;
my::swap(a, b); // 自动推演类型: swap<int>(a, b)
cout << a << ", " << b << endl;
char c = 30;
cout << a << ", " << (int)c << endl;
my::swap(a, c); // 自动推演类型
cout << a << ", " << (int)c << endl;
return 0;
}