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libstdc++: Reorder constraints on std::span::span(Range&&) constructor.

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In PR libstdc++/103013 Tim Song pointed out that we could reorder the
constraints of this constructor. That's worth doing just to reduce the
work the compiler has to do during overload resolution, even if it isn't
needed to make the code in the PR work.

libstdc++-v3/ChangeLog:

	* include/std/span (span(Range&&)): Reorder constraints.
This commit is contained in:
Jonathan Wakely 2021-11-01 11:32:39 +00:00
parent 679652a77d
commit 09bc98098e
1 changed files with 3 additions and 3 deletions
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6
libstdc++-v3/include/std/span
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@ -201,11 +201,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
{ }
template<typename _Range>
requires ranges::contiguous_range<_Range> && ranges::sized_range<_Range>
&& (ranges::borrowed_range<_Range> || is_const_v<element_type>)
&& (!__detail::__is_span<remove_cvref_t<_Range>>)
requires (!__detail::__is_span<remove_cvref_t<_Range>>)
&& (!__detail::__is_std_array<remove_cvref_t<_Range>>)
&& (!is_array_v<remove_cvref_t<_Range>>)
&& ranges::contiguous_range<_Range> && ranges::sized_range<_Range>
&& (ranges::borrowed_range<_Range> || is_const_v<element_type>)
&& __is_compatible_ref<ranges::range_reference_t<_Range>>::value
constexpr explicit(extent != dynamic_extent)
span(_Range&& __range)