c++ - How to work around `using K = ...` in MSVC 2012? -

it appears msvc 2012 doesn't back upwards using k = ...;-type declarations. example, code:

template <class map> inline void foo(map &m) {   using k = typename map::key_type;   using v = typename map::mapped_type;   // ... }

the result syntax error:

error c2143: syntax error : missing ';' before '=' error c2873: 'k' : symbol cannot used in using-declaration

how can work around missing feature of msvc 2012, without upgrading compiler?

microsoft's back upwards c++11 incomplete, , 1 of things that's missing in vs2012. in case, should able utilize old-fashioned typedef; e.g.:

typedef typename map::key_type k;

the place workaround falls apart when type templated:

template<typename t> using bar = foo<t>; // ok if compiler supports  template<typename t> typedef foo<t> bar; // doesn't compile

but still @ to the lowest degree have option:

template<typename t> struct bar { typedef foo<t> type; };

c++ templates visual-studio-2012 c++11 types

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