24 Containers library [containers]

24.7 Views [views]

24.7.3 Multidimensional access [views.multidim] Accessor policy [mdspan.accessor] Class template default_accessor [mdspan.accessor.default] Overview [mdspan.accessor.default.overview]

namespace std { template<class ElementType> struct default_accessor { using offset_policy = default_accessor; using element_type = ElementType; using reference = ElementType&; using data_handle_type = ElementType*; constexpr default_accessor() noexcept = default; template<class OtherElementType> constexpr default_accessor(default_accessor<OtherElementType>) noexcept; constexpr reference access(data_handle_type p, size_t i) const noexcept; constexpr data_handle_type offset(data_handle_type p, size_t i) const noexcept; }; }
default_accessor meets the accessor policy requirements.
ElementType is required to be a complete object type that is neither an abstract class type nor an array type.
Each specialization of default_accessor is a trivially copyable type that models semiregular.
is an accessible range for an object p of type data_handle_type and an object of type default_accessor if and only if [p, p + n) is a valid range.