24 Ranges library [ranges]

24.3 Range access [range.access]

24.3.14 ranges​::​cdata [range.prim.cdata]

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