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Subject: [Bug c++/49045] [C++0x] unexpected "different exception specifier" error with noexcept
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49045

--- Comment #5 from Jason Merrill <jason at gcc dot gnu.org> 2011-05-18 18:24:31 UTC ---
Or, rather:

template<typename _Tp>
  void
  swap(_Tp&, _Tp&);

template<class T> void __swap_dummy(T&& a,T&& b)
  noexcept(noexcept(swap(a,b)));

template<typename _Tp, __SIZE_TYPE__ _Nm>
  void
  swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
  noexcept(noexcept(__swap_dummy(*__a, *__b)));

template<typename _Tp, __SIZE_TYPE__ _Nm>
  void
  swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
  noexcept(noexcept(__swap_dummy(*__a, *__b)))
{ swap(*__a,*__b); }

-----

__swap_dummy doesn't actually need a body, but it does need a
noexcept-specifier.