std::default_accessor - cppreference.com

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`template< class ElementType > class default_accessor;`		(since C++23)

A specialization of 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

	constructs a `default_accessor` (public member function)
	returns a n^th element provided by arguments (public member function)
	returns a data handle advanced by an offset value (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;`