c++ - "ambiguating new declaration" error for a templated method in a templated class -

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i have written following earth-shattering application:

class somea { }; class someb { }; class somec { };  template <typename a, typename b, typename... cs> class foo { public:     template <typename u> static void bar(); };  template <typename u> void foo<somea, someb, somec>::bar() { };  int main() { return 0; }

when compile (gcc 4.9.3 -std=c++11), following error:

a.cpp:10:36: error: ambiguating new declaration of ‘static void foo<somea, someb, somec>::bar()’  void foo<somea, someb, somec>::bar() { };                                     ^ a.cpp:6:36: note: old declaration ‘static void foo<a, b, cs>::bar() [with u = u; = somea; b = someb; cs = {somec}]’   template <typename u> static void bar();                                     ^

why "ambiguating declaration", , how else can implement bar us specific instantiation of foo?

with clang 3.6.2, error:

a.cpp:9:1: error: template parameter list matching non-templated nested type 'foo<somea, someb, somec>' should empty ('template<>') template <typename u> ^        ~~~~~~~~~~~~

i don't either. how supposed template on u if clang wants empty parameter list?

no idea ambiguating new declaration means, you're specializing enclosing class template foo, need indicate empty template parameter list

template <> template <typename u> void foo<somea, someb, somec>::bar() { }

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