1. 函数模板利用关键字 template
2. 使用函数模板有两种方式：自动类型推导、显示指定类型
3. 模板的目的是为了提高复用性，将类型参数化## 自动类型推导

自动推导类型

template<typename T>   //第一种模板类
void myvalue(T &a, T &b)
{T temp = a;a = b;b = temp;
}
float a = 2;
float b = 3;
//第一种  自动类型推导
myvalue(a, b);
cout << "a = " << a << endl;
cout << "b = " << b << endl;

显示指定类型

	//第二种 显示指定类型myvalue<float>(a, b);cout << "a = " << a << endl;cout << "b = " << b << endl;

#define _CRT_SECURE_NO_DEPRECATE
#include<iostream>
using namespace std;void int_value(int &a, int &b)
{int temp = a;a = b;b = temp;
}void float_value(float& a, float& b)
{float temp = a;a = b;b = temp;
}
template<typename T>   //第一种模板类
void myvalue(T &a, T &b)
{T temp = a;a = b;b = temp;
}void test1()
{float a = 2;float b = 3;//第一种  自动类型推导myvalue(a, b);cout << "a = " << a << endl;cout << "b = " << b << endl;//第二种 显示指定类型myvalue<float>(a, b);cout << "a = " << a << endl;cout << "b = " << b << endl;
}//void test2()
//{
//	float c = 20.5;
//	float d = 30.2;
//	//float_value(c, d);
//	cout << "c = " << c << endl;
//	cout << "d = " << d << endl;
//}int main()
{test1();//test2();return 0;
}