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std::default_accessor

Defined in header <mdspan> 
template< class ElementType >
class default_accessor;
 (since C++23)

The std::default_accessor class template is the default AccessorPolicy used by std::mdspan if no user-specified accessor policy is provided.

Each specialization of default_accessor models semiregular and is TriviallyCopyable.

Template parameters

ElementType - the element type. Shall be a complete object type that is neither an abstract class type nor an array type. Otherwise, the program is ill-formed

Member types

Member type Definition
offset_policy default_accessor
element_type ElementType
reference ElementType&
data_handle_type ElementType*

Member functions

(constructor)
constructs a default_accessor
(public member function)
access
returns a nth element provided by arguments
(public member function)
offset
returns a data handle that has an offset provided by arguments
(public member function)

std::default_accessor::default_accessor

constexpr default_accessor() noexcept = default;
 (1) 
template< class OtherElementType >
constexpr default_accessor( default_accessor<OtherElementType> ) noexcept {}
 (2)
1) Default constructs a default_accessor.
2) Constructs a default_accessor from default_accessor<OtherElementType>. The constructor has no visible effect. This overload participates in overload resolution only if std::is_convertible_v<OtherElementType(*)[], element_type(*)[]> is true.

std::default_accessor::access

constexpr reference access( data_handle_type p, std::size_t i ) const noexcept;

Equivalent to return p[i];.

std::default_accessor::offset

constexpr data_handle_type offset( data_handle_type p, std::size_t i ) const noexcept;

Equivalent to return p + i;.

Example

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