c++函数模板

函数模板存在的意义；如果同一函数，参数类型有所不同，相同的功能可能会定义多个函数实例，这十分繁冗

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

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

void main()
{
    int a = 8,b=10;
    swap(a,b);
    cout << "a----" << a << "b---" <<b << endl;
    char *x = "陈培昌";
    char *y = "付高峰";
    swap(x,y);
    cout << "x----" << x << "y---" << y << endl;
    system("pause");
}

输出结果

 

 

• 定义函数模板

#include<iostream>
using namespace std;


template <typename T>
void myswap(T &a,T &b)
{
    T c;
    c = a;
    a = b;
    b = c;
}

void main()
{
    int a = 8;
    int b = 10;
    myswap<int>(a,b);
    cout << "a----" << a << "b---" <<b << endl;
    char *x = "陈培昌";
    char *y = "付高峰";
    //cout << "x----" << x << "y---" << y << endl;
    myswap<char*>(x, y);
    cout << "x----" << x << "y---" << y << endl;
    system("pause");
}

输出结果：