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noexcept for <tuple>. And in the process learned that I had done it wrong for pair's swap. I needed to create an __is_nothrow_swappable<T>::value trait that was smart enought to answer false when __is_swappable<T>::value is false. Otherwise one gets compile-time errors when using pair or tuple of non-swappable types, even if you never try to swap the pair or tuple.

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@132204 91177308-0d34-0410-b5e6-96231b3b80d8
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Howard Hinnant
2011-05-27 19:08:18 +00:00
parent e9b2c2d669
commit a5e0121b8d
4 changed files with 111 additions and 40 deletions
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12
include/__tuple
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@@ -78,27 +78,27 @@ template <class _Tp, size_t _Size> struct __tuple_like<array<_Tp, _Size> > : tru
template <size_t _Ip, class ..._Tp>
typename tuple_element<_Ip, tuple<_Tp...> >::type&
get(tuple<_Tp...>&);
get(tuple<_Tp...>&) _NOEXCEPT;
template <size_t _Ip, class ..._Tp>
const typename tuple_element<_Ip, tuple<_Tp...> >::type&
get(const tuple<_Tp...>&);
get(const tuple<_Tp...>&) _NOEXCEPT;
template <size_t _Ip, class ..._Tp>
typename tuple_element<_Ip, tuple<_Tp...> >::type&&
get(tuple<_Tp...>&&);
get(tuple<_Tp...>&&) _NOEXCEPT;
template <size_t _Ip, class _T1, class _T2>
typename tuple_element<_Ip, pair<_T1, _T2> >::type&
get(pair<_T1, _T2>&);
get(pair<_T1, _T2>&) _NOEXCEPT;
template <size_t _Ip, class _T1, class _T2>
const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
get(const pair<_T1, _T2>&);
get(const pair<_T1, _T2>&) _NOEXCEPT;
template <size_t _Ip, class _T1, class _T2>
typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
get(pair<_T1, _T2>&&);
get(pair<_T1, _T2>&&) _NOEXCEPT;
template <size_t _Ip, class _Tp, size_t _Size>
_Tp&