26 Ranges library [ranges]

26.3 Range access [range.access]

26.3.8 ranges​::​crbegin [range.access.crbegin]

The name ranges​::​crbegin denotes a customization point object ([customization.point.object]).
The expression ranges​::​​crbegin(E) for a subexpression E of type T is expression-equivalent to:
  • ranges​::​​rbegin(static_­cast<const T&>(E)) if E is an lvalue.
  • Otherwise, ranges​::​rbegin(static_­cast<const T&&>(E)).
[Note 1:
Whenever ranges​::​crbegin(E) is a valid expression, its type models input_­or_­output_­iterator.
— end note]