std::mdspan<T,Extents,LayoutPolicy,AccessorPolicy>::operator[]
From cppreference.com
| template< class... OtherIndexTypes > constexpr reference operator[]( OtherIndexTypes... indices ) const; |
(1) | (since C++23) |
| template< class OtherIndexType > constexpr reference operator[] |
(2) | (since C++23) |
| template< class OtherIndexType > constexpr reference operator[] |
(3) | (since C++23) |
Returns a reference to the indicesth element of the mdspan.
1) Equivalent to return
acc_ .access(ptr_, map_ (static_cast<index_type>(std::move(indices))...));. This overload participates in overload resolution only if all following values are true:
- (std::is_convertible_v<OtherIndexTypes, index_type> && ...)
- (std::is_nothrow_constructible_v<index_type, OtherIndexTypes> && ...)
- sizeof...(OtherIndexTypes) == rank()
|
If extents_type:: |
(until C++26) |
|
If extents_type::
|
(since C++26) |
2,3) Let
std::index_sequence<P...>> is true, equivalent to return operator[](extents_type::
P be a parameter pack such that std::is_same_v<std::make_index_sequence<rank()>,std::index_sequence<P...>> is true, equivalent to return operator[](extents_type::
index-cast (std::as_const(indices[P]))...);. This overload participates in overload resolution only if all following values are true:
- std::is_convertible_v<const OtherIndexType&, index_type>
- std::is_nothrow_constructible_v<index_type, const OtherIndexType&>
Contents |
[edit] Parameters
| indices | - | the indices of the element to access |
[edit] Return value
A reference to the element.
[edit] Example
| This section is incomplete Reason: no example |
[edit] Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
| DR | Applied to | Behavior as published | Correct behavior |
|---|---|---|---|
| LWG 3974 | C++23 | overloads (2,3) did not apply extents_type::index-cast
|
applies |
[edit] See also
| This section is incomplete |
