526互联

类模板和友元

发布时间 2024-01-13 18:58:59作者: λios
友元内部实现 
#include<iostream>
#include<stdio.h>
#include<stdlib.h>
#include<algorithm>
#include<numeric>

template <class NameType,class AgeType>
class Mark {
	friend void printMaker(Mark<NameType, AgeType>& p) {
		std::cout << "class inside create\n" << p.name << ' ' << p.age << '\n';
	}
public:
	Mark(NameType name, AgeType age);
	//void printMark();

private:
	NameType name;
	AgeType age;
};
template<class NameType,class AgeType>
Mark<NameType, AgeType>::Mark(NameType name, AgeType age) {
	this->name = name;
	this->age = age;
}

void test01() {
	Mark<std::string, int> m("123123", 200);
	printMaker(m);
}

int main() {

	test01();
	
	return 0;
}
友元外部实现 

#include<iostream>
#include<stdio.h>
#include<stdlib.h>
#include<algorithm>
#include<numeric>

//template <class NameType,class AgeType>
//class Mark;
//
//template <class NameType,class AgeType>
//void printMaker(Mark<NameType, AgeType>& p);

template <class NameType,class AgeType>
class Mark {
	template<class NameType, class AgeType>
	friend void printMaker(Mark<NameType, AgeType>& p);
public:
	Mark(NameType name, AgeType age);
	//void printMark();
	
private:
	NameType name;
	AgeType age;
};

template<class NameType,class AgeType>
Mark<NameType, AgeType>::Mark(NameType name, AgeType age) {
	this->name = name;
	this->age = age;
}

template<class NameType,class AgeType>

void printMaker(Mark<NameType,AgeType>&p) {
	std::cout << p.name << ' ' << p.age << '\n';
}


void test01() {
	Mark<std::string, int> m("123123", 200);
	printMaker(m);
}

int main() {

	test01();
	
	return 0;
}