24 Ranges library [ranges]

24.3 Range access [range.access]

24.3.11 ranges​::​ssize [range.prim.ssize]

1
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The name ranges​::​ssize denotes a customization point object ([customization.point.object]).
The expression ranges​::​ssize(​E) for a subexpression E of type T is expression-equivalent to:
  • (1.1)
    If range_­difference_­t<T> has width less than ptrdiff_­t, static_­cast<ptrdiff_­t>(ranges​::​
    size(E))    .
  • (1.2)
    Otherwise, static_­cast<range_­difference_­t<T>>(ranges​::​size(E)).