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Make tuple_element static_assert in pair if the index is out of range. Also, add a message to variant_alternative<> in the similar case (it already asserted). Add tests for this

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@305196 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Marshall Clow
2017-06-12 16:13:17 +00:00
parent 568c481c7b
commit bc37f8d93d
4 changed files with 66 additions and 1 deletions
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6
include/utility
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@@ -653,6 +653,12 @@ template <class _T1, class _T2>
class _LIBCPP_TEMPLATE_VIS tuple_size<pair<_T1, _T2> >
: public integral_constant<size_t, 2> {};
template <size_t _Ip, class _T1, class _T2>
class _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, pair<_T1, _T2> >
{
static_assert(_Ip < 2, "Index out of bounds in std::tuple_element<std::pair<T1, T2>>");
};
template <class _T1, class _T2>
class _LIBCPP_TEMPLATE_VIS tuple_element<0, pair<_T1, _T2> >
{