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C++ named requirements: AccessorPolicy (since C++23)

AccessorPolicy defines how elements are accessed from a given data handle to such elements and an index. It is used as a policy in std::mdspan to specify the access to a reference of an element using an underlying 1D index.

A type A satisfies AccessorPolicy if it models copyable, and the following are true:

• std::is_nothrow_move_constructible_v<A>
• std::is_nothrow_move_assignable_v<A>
• std::is_nothrow_swappable_v<A>

And, given the following types and values, the expressions shown in the table below are valid and have the indicated semantics:

1. ↑ Not required to be element_type*.
2. ↑ Not required to be element_type&.

• The expression is equality-preserving.

• A value q such that for b being A::offset_policy(a), and any integer n for which [​0​, n) is an accessible range (see below) of p and a.

• [​0​, n - i) is an accessible range of q and b; and
• b.access(q, j) provides access to the same element as a.access(p, i + j), for every j in the range [​0​, n - i).

• The expression is equality-preserving.

A range of indices [​0​, N) is an accessible range of a given data handle and an accessor if, for each index in the range, the access member function produces a valid reference to an element.

The following standard library types satisfy AccessorPolicy requirements:

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