C++11 - friend with a template alias

From:

wojtek.mula@googlemail.com

Newsgroups:

comp.lang.c++.moderated

Date:

Fri, 4 Jul 2014 21:23:35 CST

Message-ID:

<2cde5290-3bf5-498c-8b1a-202a4627c3ba@googlegroups.com>

Hi, I want to declare alias template as a friend of class. I've tried
following constructions, that work for classes:

-- start --
#include <vector>

template <typename T>
using my_type = std::vector<T>;

class X {
    // MSVC 2013 : error C2955: 'my_type' : use of alias template
    // requires template argument list
    // GCC 4.8.3 : invalid use of template-name 'my_type' without
    // an argument list
    template <typename> friend my_type;

    // MSVC 2013 : error C2988: unrecognizable template declaration/definition
    // GCC 4.8.3 : expected unqualified-id before ';' token
    template <typename T> friend my_type<T>;

    // MSVC 2013 : error C2920: redefinition : 'my_type' : class template has
    // already been declared as 'using my_type = std::vector<T,std::allocator<_Ty>>'
    // GCC 4.8.3 : declaration of template 'template<class T> struct my_type'
    // conflicts with previous declaration 'template<class T>
    // using my_type = std::vector<T>'
    template <typename T> friend class my_type;
};
-- end --

Aliases aren't mentioned in the section about friends, standard merely says
(section 11.3, paragraph 3):

    A friend declaration that does not declare a function shall have one of
    the following forms:
        friend elaborated-type-specifier ;
        friend simple-type-specifier ;
        friend typename-specifier ;

What is a valid syntax? Or, maybe it's not possible?

TIA
w.

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