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[libcxx] replaces SFINAE with requires-expressions in bind_front and bind_back #68249

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Merged
merged 1 commit into from
Oct 5, 2023
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[libcxx] replaces SFINAE with requires-expressions in bind_front and bind_back #68249

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11 changes: 3 additions & 8 deletions libcxx/include/__functional/bind_back.h
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Original file line number Diff line number Diff line change
Expand Up @@ -43,14 +43,9 @@ struct __bind_back_t : __perfect_forward<__bind_back_op<tuple_size_v<_BoundArgs>
using __perfect_forward<__bind_back_op<tuple_size_v<_BoundArgs>>, _Fn, _BoundArgs>::__perfect_forward;
};

template <class _Fn, class ..._Args, class = enable_if_t<
_And<
is_constructible<decay_t<_Fn>, _Fn>,
is_move_constructible<decay_t<_Fn>>,
is_constructible<decay_t<_Args>, _Args>...,
is_move_constructible<decay_t<_Args>>...
>::value
>>
template <class _Fn, class... _Args>
requires is_constructible_v<decay_t<_Fn>, _Fn> && is_move_constructible_v<decay_t<_Fn>> &&
(is_constructible_v<decay_t<_Args>, _Args> && ...) && (is_move_constructible_v<decay_t<_Args>> && ...)
_LIBCPP_HIDE_FROM_ABI
constexpr auto __bind_back(_Fn&& __f, _Args&&... __args)
noexcept(noexcept(__bind_back_t<decay_t<_Fn>, tuple<decay_t<_Args>...>>(_VSTD::forward<_Fn>(__f), _VSTD::forward_as_tuple(_VSTD::forward<_Args>(__args)...))))
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11 changes: 3 additions & 8 deletions libcxx/include/__functional/bind_front.h
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Expand Up @@ -42,14 +42,9 @@ struct __bind_front_t : __perfect_forward<__bind_front_op, _Fn, _BoundArgs...> {
using __perfect_forward<__bind_front_op, _Fn, _BoundArgs...>::__perfect_forward;
};

template <class _Fn, class... _Args, class = enable_if_t<
_And<
is_constructible<decay_t<_Fn>, _Fn>,
is_move_constructible<decay_t<_Fn>>,
is_constructible<decay_t<_Args>, _Args>...,
is_move_constructible<decay_t<_Args>>...
>::value
>>
template <class _Fn, class... _Args>
requires is_constructible_v<decay_t<_Fn>, _Fn> && is_move_constructible_v<decay_t<_Fn>> &&
(is_constructible_v<decay_t<_Args>, _Args> && ...) && (is_move_constructible_v<decay_t<_Args>> && ...)
_LIBCPP_HIDE_FROM_ABI
constexpr auto bind_front(_Fn&& __f, _Args&&... __args) {
return __bind_front_t<decay_t<_Fn>, decay_t<_Args>...>(_VSTD::forward<_Fn>(__f), _VSTD::forward<_Args>(__args)...);
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