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 ?
};

为模板提供友谊的正确语法是什么？

Answer 1

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

适用于VS2008,允许MyStruct访问该类.

Answer 2

根据这个网站,正确的语法将是

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