[Bug libstdc++/63500] [4.9/5 Regression] bug in debug version of std::make_move_iterator?

[François Dumont]

Hi

     Here is a proposal to fix the issue with iterators which do not 
expose lvalue references when dereferenced. I simply chose to detect 
such an issue in c++11 mode thanks to the is_lvalue_reference meta function.

2014-10-15  François Dumont  <fdumont@gcc.gnu.org>

     PR libstdc++/63500
     * include/bits/cpp_type_traits.h (__true_type): Add __value constant.
     (__false_type): Likewise.
     * include/debug/functions.h (__foreign_iterator_aux2): Do not check for
     foreign iterators if input iterators returns rvalue reference.
     * testsuite/23_containers/vector/63500.cc: New.

Tested under Linux x86_64.

François

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