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Date: Thu, 03 Dec 2009 18:12:00 -0000
Subject: [Bug c++/42266]  New: [C++0x] ICE with decltype and variadic templates
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From: "paolo dot carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
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I tried to reduce as much as possible (maybe too much, we'll see...) an issue
which is blocking our work on std::bind. Note, the problem disappears if I
simplify the testcase further to not use variadic templates while keeping the
rest unchanged.

Jason, can you help us?

//////////////////

template<typename... _Elements>
  class tuple;

template<typename _Arg>
  class _Mu;

template<typename _Signature>
  struct _Bind;

template<typename _Functor, typename... _Bound_args>
  class _Bind<_Functor(_Bound_args...)>
  {
    template<typename... _Args, typename
             = decltype(_Functor()(_Mu<_Bound_args>()(_Bound_args(),
                                                      tuple<_Args...>())...) )>
      void __call() { }
  };

template<typename _Functor, typename _Arg>
  _Bind<_Functor(_Arg)>
  bind(_Functor, _Arg) { }

struct State
{
  bool ready() { return true; }

  void f()
  {
    bind(&State::ready, this);
  }
};


-- 
           Summary: [C++0x] ICE with decltype and variadic templates
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: paolo dot carlini at oracle dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42266