24 Ranges library [ranges]

24.3 Range access [range.access]

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

The name ranges::crbegin denotes a customization point object.
The expression ranges::​crbegin(E) for some 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)).
Whenever ranges::crbegin(E) is a valid expression, its type models Iterator.
end note