函数模板

Tmp为用户自定义的名字

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template< typename Tmp>

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适用于所有类型

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#include<iostream>
#include<cstring>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<string>
#include<algorithm>
using namespace std;
template<typename Tmp>
Tmp Add( Tmp a, Tmp b) {
    return a + b ;
}
int main() {
    double x = 5.8, y = 9.3;
    cout << Add(x, y) <<  endl;
    string a = "Hello ", b = "World!";
    cout << a + b << endl;
    return 0;
}