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Make some std::variant helper functions noexcept

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* include/std/variant (__detail::__variant::__ref_cast): Remove
	unused function.
	(__detail::__variant::_Uninitialized::_M_get)
	(__detail::__variant::__get)
	(__gen_vtable_impl::__element_by_index_or_cookie): Add noexcept.

From-SVN: r270501
This commit is contained in:
Jonathan Wakely 2019-04-23 10:55:28 +01:00 committed by Jonathan Wakely
parent 4b5689aa6c
commit be46043e07
2 changed files with 24 additions and 20 deletions
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8
libstdc++-v3/ChangeLog
View File

@ -1,3 +1,11 @@
2019-04-23 Jonathan Wakely <jwakely@redhat.com>
* include/std/variant (__detail::__variant::__ref_cast): Remove
unused function.
(__detail::__variant::_Uninitialized::_M_get)
(__detail::__variant::__get)
(__gen_vtable_impl::__element_by_index_or_cookie): Add noexcept.
2019-04-21 Iain Sandoe <iain@sandoe.co.uk>
* testsuite/17_intro/headers/c++1998/charset.cc: Skip for Darwin8

36
libstdc++-v3/include/std/variant
View File

@ -203,16 +203,16 @@ namespace __variant
: _M_storage(std::forward<_Args>(__args)...)
{ }
constexpr const _Type& _M_get() const &
constexpr const _Type& _M_get() const & noexcept
{ return _M_storage; }
constexpr _Type& _M_get() &
constexpr _Type& _M_get() & noexcept
{ return _M_storage; }
constexpr const _Type&& _M_get() const &&
constexpr const _Type&& _M_get() const && noexcept
{ return std::move(_M_storage); }
constexpr _Type&& _M_get() &&
constexpr _Type&& _M_get() && noexcept
{ return std::move(_M_storage); }
_Type _M_storage;
@ -229,33 +229,29 @@ namespace __variant
_Type(std::forward<_Args>(__args)...);
}
const _Type& _M_get() const &
const _Type& _M_get() const & noexcept
{ return *_M_storage._M_ptr(); }
_Type& _M_get() &
_Type& _M_get() & noexcept
{ return *_M_storage._M_ptr(); }
const _Type&& _M_get() const &&
const _Type&& _M_get() const && noexcept
{ return std::move(*_M_storage._M_ptr()); }
_Type&& _M_get() &&
_Type&& _M_get() && noexcept
{ return std::move(*_M_storage._M_ptr()); }
__gnu_cxx::__aligned_membuf<_Type> _M_storage;
};
template<typename _Ref>
_Ref __ref_cast(void* __ptr)
{
return static_cast<_Ref>(*static_cast<remove_reference_t<_Ref>*>(__ptr));
}
template<typename _Union>
constexpr decltype(auto) __get(in_place_index_t<0>, _Union&& __u)
constexpr decltype(auto)
__get(in_place_index_t<0>, _Union&& __u) noexcept
{ return std::forward<_Union>(__u)._M_first._M_get(); }
template<size_t _Np, typename _Union>
constexpr decltype(auto) __get(in_place_index_t<_Np>, _Union&& __u)
constexpr decltype(auto)
__get(in_place_index_t<_Np>, _Union&& __u) noexcept
{
return __variant::__get(in_place_index<_Np-1>,
std::forward<_Union>(__u)._M_rest);
@ -263,7 +259,8 @@ namespace __variant
// Returns the typed storage for __v.
template<size_t _Np, typename _Variant>
constexpr decltype(auto) __get(_Variant&& __v)
constexpr decltype(auto)
__get(_Variant&& __v) noexcept
{
return __variant::__get(std::in_place_index<_Np>,
std::forward<_Variant>(__v)._M_u);
@ -981,7 +978,7 @@ namespace __variant
template<size_t __index, typename _Variant>
static constexpr decltype(auto)
__element_by_index_or_cookie(_Variant&& __var)
__element_by_index_or_cookie(_Variant&& __var) noexcept
{
if constexpr (__index != variant_npos)
return __variant::__get<__index>(std::forward<_Variant>(__var));
@ -1166,8 +1163,7 @@ namespace __variant
template<typename _Tp, typename... _Types>
constexpr add_pointer_t<const _Tp>
get_if(const variant<_Types...>* __ptr)
noexcept
get_if(const variant<_Types...>* __ptr) noexcept
{
static_assert(__detail::__variant::__exactly_once<_Tp, _Types...>,
"T should occur for exactly once in alternatives");