c++ - 你如何将结构模板标记为朋友？

Question

我有这样的代码：

template <typename T, typename U> struct MyStruct {
    T aType;
    U anotherType;
};

class IWantToBeFriendsWithMyStruct
{
    friend struct MyStruct; //what is the correct syntax here ?
};

赋予模板友谊的正确语法是什么？

Answer 1

class IWantToBeFriendsWithMyStruct
{
    template <typename T, typename U>
    friend struct MyStruct;
};

在 VS2008 中工作，并允许 MyStruct 访问该类。

Answer 2

根据这个站点，正确的语法是

class IWantToBeFriendsWithMyStruct
{
    template <typename T, typename U> friend struct MyStruct; 
}