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libstdc++: Fix return type of empty zip_/adjacent_transform [PR106803]

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PR libstdc++/106803

libstdc++-v3/ChangeLog:

	* include/std/ranges (views::_ZipTransform::operator()): Correct
	return type in the empty case.
	(views::_AdjacentTransform::operator()): Likewise.
This commit is contained in:
Patrick Palka 2022-09-09 14:59:14 -04:00
parent e469506b7f
commit 8298427f6b
1 changed files with 2 additions and 2 deletions
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4
libstdc++-v3/include/std/ranges
View file

@ -5071,7 +5071,7 @@ namespace views::__adaptor
operator() [[nodiscard]] (_Fp&& __f, _Ts&&... __ts) const
{
if constexpr (sizeof...(_Ts) == 0)
return views::empty<decay_t<invoke_result_t<_Fp>>>;
return views::empty<decay_t<invoke_result_t<decay_t<_Fp>&>>>;
else
return zip_transform_view(std::forward<_Fp>(__f), std::forward<_Ts>(__ts)...);
}
@ -5762,7 +5762,7 @@ namespace views::__adaptor
operator() [[nodiscard]] (_Range&& __r, _Fp&& __f) const
{
if constexpr (_Nm == 0)
return views::empty<tuple<>>;
return zip_transform(std::forward<_Fp>(__f));
else
return adjacent_transform_view<all_t<_Range>, decay_t<_Fp>, _Nm>
(std::forward<_Range>(__r), std::forward<_Fp>(__f));