std::layout_stride::mapping<Extents>::required_span_size

 

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std::mdspan

Member functions mdspan::mdspan mdspan::operator= Element access mdspan::operator[] Observers mdspan::rank mdspan::rank_dynamic mdspan::static_extent mdspan::extent mdspan::size mdspan::empty mdspan::stride mdspan::extents mdspan::data_handle mdspan::mapping mdspan::accessor mdspan::is_uniquemdspan::is_exhaustivemdspan::is_stridedmdspan::is_always_uniquemdspan::is_always_exhaustivemdspan::is_always_strided

Non-member functions swap(std::mdspan) Subviews submdspan (C++26) submdspan_extents (C++26) Helper types and templates extentsdextents dims (C++26) default_accessor aligned_accessor (C++26) Layout mapping policies layout_left layout_right layout_stride layout_left_padded (C++26) layout_right_padded (C++26) Subviews helpers full_extent (C++26) strided_slice (C++26) submdspan_mapping_result (C++26) Deduction guides

 

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mapping::required_span_size

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mapping::is_uniquemapping::is_exhaustivemapping::is_stridedmapping::is_always_uniquemapping::is_always_exhaustivemapping::is_always_strided

mapping::stride

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submdspan_mapping(std::layout_stride::mapping) (C++26)

 

constexpr index_type required_span_size() const noexcept;		(since C++23)

Returns the required size of the mapping.

Let s be equal to:

• 1, if extents().rank() == 0 is true,
• otherwise, ​0​, if the size of the multidimensional index space extents() is ​0​,
• otherwise, 1 plus the sum of products of extents().extent(r) - 1 and extents_type::index-cast(strides_[r]) for all r in the range [​0​, extents().rank()).

A call is equivalent to return s;.

Return value

The required size of the mapping.

Example

See also

required_span_size	returns the required size of the mapping (public member function of std::layout_left::mapping<Extents>)
required_span_size	returns the required size of the mapping (public member function of std::layout_right::mapping<Extents>)
size	returns the size of the multidimensional index space (public member function of std::mdspan<T,Extents,LayoutPolicy,AccessorPolicy>)

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