c++ 基础知识-模板3

c++ 基础知识-模板3

1.类模板成员函数类外实现

类模板函数类外实现

#include <iostream>
#include <string>
using namespace std;

//类模板函数类外实现
template<class T1,class T2>
class Person
{
public:
	//构造函数
	Person(T1 name,T2 age);
	//成员函数
	void showInfo();

private:
	//成员变量
	T1 m_name;
	T2 m_age;
};

template<class T1,class T2>
Person<T1,T2>::Person(T1 name,T2 age)
{
	this->m_name = name;
	this->m_age = age;
}

template<class T1,class T2>
void Person<T1,T2>::showInfo()
{
	cout<<"Person()"<<endl;
	cout<<this->m_name<<endl;
	cout<<this->m_age<<endl;
}

void test()
{
	Person<string,int>p("hh",12);
	p.showInfo();
	//输出
	//Person()
	//	hh
	//	12
}

int main()
{
	test();
	return 0;
}

2.类模板与友元

#include <iostream>
#include <string>
using namespace std;

template<class T1,class T2>
class Person
{
	//友元函数，访问类内私有成员
	friend void showInfo(Person<T1,T2> &p)
	{
		cout<<p.m_name<<endl;
		cout<<p.m_age<<endl;
	}
public:
	Person(T1 name,T2 age)
	{
		this->m_name = name;
		this->m_age = age;
	}
private:
	T1 m_name;
	T2 m_age;
};

void test()
{
	Person<string,int>p("xiaohu",22);
	showInfo(p);
}

int main()
{
	test();
	return 0;
}