[Bug libstdc++/49058] [C++0x] Bind no-arguments functor failed using std::bind with -pedantic option.

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49058

--- Comment #10 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-05-22 
21:29:56 UTC ---
For a complete example:

struct F {
  int operator()() const { return 0; }
  void operator()() const { };
};

int main()
{
  auto const b = std::bind( F() );
  int i = b();  // b is const here, must return int
}

[func.bind.bind] p3 requires that the cv-qualifiers of the call wrapper are
used when calling the target object