5 Quantities and units library [quantities]

5.4 Reference [qty.ref]

5.4.3 Quantity specification [qty.spec]

5.4.3.6 Hierarchy algorithms [qty.spec.hier.algos]

5.4.3.6.5 Is child of [qty.is.child.of]

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template<QuantitySpec Child, QuantitySpec Parent> consteval bool is-child-of(Child ch, Parent p); // exposition only
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Returns: If h(p) has more elements than h(ch), returns false.
Otherwise, let C be a tuple of the last s elements of h(ch), where s is the number of elements in h(p).
Returns == p.