C++ 基本

• template

#include<iostream>
using namespace std;

template<typename  T> void swap(T& t1, T& t2) {
    T tmpT;
    tmpT = t1;
    t1 = t2;
    t2 = tmpT;
}

int main(){
    int a = 1, b = 2;
    swap<int>();
    cout<<a<<" "<<b<<endl;
}