c++引用作为函数参数问题

Question

#include
using namespace std;

template void swap(T &a,T &b){
T temp;
temp = a;
a = b;
b = temp;
}

int main(){

char s1[] = "Hello",s2[] = "hi";


swap(s1,s2);//为什么这样写不对

}

Answer 1

因为char[6]和char[3]不能用你的模板T表示，它们也不是一个类型

#include<iostream> 
using namespace std; 
template <class T> 
void swap(T &a,T &b){
    T temp;
    temp = a;
    a = b;
    b = temp;
}

int main(){

    string s1 = "Hello", s2 = "hi";

    swap(s1,s2);
    cout << s1 << endl << s2;
}