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Subject: [Bug c++/50864] New: SFINAE bug
Date: Tue, 25 Oct 2011 13:35:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50864

             Bug #: 50864
           Summary: SFINAE bug
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: fate66260@gmail.com


[C++0x] 
compiler option: -Wall -std=c++0x -O3

error message:
internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

source code:
namespace concept_impl {

template < class lhs, class rhs >
struct is_arrow_operable_impl
{
private:
  template < class T = lhs, class U = rhs
           , class = decltype(std::declval<T>() -> std::declval<U>()) // <-
here
           >
  static mpl::true_
  test (int);

  template < class... >
  static mpl::false_
  test (...);

public:
  typedef decltype(test (0)) type;
};


} // namespace concept_impl

template < class lhs, class rhs >
struct is_arrow_operable
  : public concept_impl::is_arrow_operable_impl<lhs, rhs>::type
{ };

// test type
struct foo
{
  int* p;
};

// call this meta function
static_assert(is_arrow_dereferencable<foo*, int* foo::*>::value ,"error");