c ++：我如何调用一个类中定义的朋友模板函数？ [英] c++: how do i call a friend template function defined inside a class?

问题描述

hi guys请帮我这个函数
i从我的书中得到了这个例子，但我不知道如何实际调用ticket函数
这是代码：

hi guys please help me with this function i got this example from my book, but i have no idea how to actually call the ticket function this is the code:

#include <iostream>
    class Manager { 
    public:
        template<typename T> 
            friend int ticket() { 
                return ++Manager::counter; 
            } 
        static int counter; 
    }; 

int main()
{
    Manager m;
    std::cout << "ticket: " << ticket<int>() << std::endl;
}

我得到候选函数不可访问错误msg
非常感谢您的查找！

i get the "candidate function(s) not accessible" error msg thanks alot for looking!

推荐答案

#include <iostream>

class Manager {
public:
    template<typename T>
        friend int ticket() {
            return ++Manager::counter;
        }
    static int counter;
};

int Manager::counter;

int main()
{
    std::cout << "ticket: " << ticket<int>() << std::endl;
    std::cout << "ticket: " << ticket<int>() << std::endl;
}

您使用什么编译器？

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