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<mdspan>: Construct mappings from extents_type rvalues when necessary #4236

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merged 1 commit into from
Dec 7, 2023
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<mdspan>: Construct mappings from extents_type rvalues when necessary #4236

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4 changes: 4 additions & 0 deletions stl/inc/mdspan
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Original file line number Diff line number Diff line change
Expand Up @@ -1075,6 +1075,8 @@ struct _Mdspan_mapping_base {

constexpr explicit _Mdspan_mapping_base(const _Extents& _Exts) : _Map(_Exts) {}

constexpr explicit _Mdspan_mapping_base(_Extents&& _Exts) : _Map(_STD move(_Exts)) {}

template <class _OtherMapping>
constexpr explicit _Mdspan_mapping_base(const _OtherMapping& _Map_) : _Map(_Map_) {}

Expand All @@ -1091,6 +1093,8 @@ struct _Mdspan_mapping_base<_Extents, _LayoutPolicy> {

constexpr explicit _Mdspan_mapping_base(const _Extents&) noexcept {}

constexpr explicit _Mdspan_mapping_base(_Extents&&) noexcept {}

template <class _OtherMapping>
constexpr explicit _Mdspan_mapping_base(const _OtherMapping& _Map_) {
// NB: Constructing _Mapping from _OtherMapping may have side effects - we should create a temporary.
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