5 Quantities and units library [quantities]

5.4 Reference [qty.ref]

5.4.8 Comparison [qty.ref.cmp]

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template<typename Q2, typename U2> friend consteval bool operator==(reference, reference<Q2, U2>);
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Returns: Q{} == Q2{} && U{} == U2{}.
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template<AssociatedUnit U2> friend consteval bool operator==(reference, U2 u2);
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Returns: Q{} == get_quantity_spec(u2) && U{} == u2.
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template<typename Q2, typename U2> friend consteval bool convertible(reference, reference<Q2, U2>);
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Returns: implicitly_convertible(Q{}, Q2{}) && convertible(U{}, U2{}).
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template<AssociatedUnit U2> friend consteval bool convertible(reference, U2 u2);
4
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Returns: implicitly_convertible(Q{}, get_quantity_spec(u2)) && convertible(U{}, u2).
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template<AssociatedUnit U1> friend consteval bool convertible(U1 u1, reference);
5
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Returns: implicitly_convertible(get_quantity_spec(u1), Q{}) && convertible(u1, U{}).