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Date: Wed, 21 Jul 2010 02:43:00 -0000
Subject: [Bug c++/45012]  New: Invalid ambiguity on partial class specialization matching
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From: "rodolfo at rodsoft dot org" <gcc-bugzilla@gcc.gnu.org>
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The following code doesn't compile unless variable RUNTIME is defined as a
"static const int" instead of an "enum":

#include <type_traits>

enum { RUNTIME = 0 };
// it compiles with the previous line commented out and the next commented in
// static const int RUNTIME=0;

template <class T, class U, class EN=void> struct foo;

template <template<int> class V, int M>
struct foo<V<M>,V<M>, typename std::enable_if<M==RUNTIME || M==2>::type> {};

template <template<int> class V1, template<int> class V2, int M>
struct foo<V1<M>,V2<M>, typename std::enable_if<M==RUNTIME || M==2>::type> {};

template <int M> struct bar {};

foo<bar<2>,bar<2>> x;


-- 
           Summary: Invalid ambiguity on partial class specialization
                    matching
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rodolfo at rodsoft dot org
 GCC build triplet: x86_64-pc-linux-gnu
  GCC host triplet: x86_64-pc-linux-gnu
GCC target triplet: x86_64-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45012