5 Quantities and units library [quantities]

5.4 Reference [qty.ref]

5.4.4 Unit [qty.unit]

5.4.4.2 Magnitude [qty.unit.mag]

5.4.4.2.4 Operations [qty.unit.mag.ops]

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template<UnitMagnitude M> friend consteval UnitMagnitude auto operator*(unit-magnitude lhs, M rhs);
1
#
Returns:
  • (1.1)
    If sizeof...(Ms) == 0 is true, returns rhs.
  • (1.2)
    Otherwise, if std​::​is_same_v<M, unit-magnitude<>>, returns lhs.
  • (1.3)
    Otherwise, returns an unspecified value equal to lhs ×rhs.
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friend consteval auto operator/(unit-magnitude lhs, UnitMagnitude auto rhs);
2
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Returns: lhs * pow<-1>(rhs).
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template<UnitMagnitude Rhs> friend consteval bool operator==(unit-magnitude, Rhs);
3
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Returns: std​::​is_same_v<unit-magnitude, Rhs>.
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template<int Num, int Den = 1> friend consteval auto pow(unit-magnitude base); // exposition only
4
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Returns:
  • (4.1)
    If Num == 0 is true, returns unit-magnitude<>{}.
  • (4.2)
    Otherwise, returns an unspecified value equal to .
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template<MagArg auto V> constexpr UnitMagnitude auto mag = see below;
5
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Constraints: V is greater than 0.
6
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Effects: If MagConstant<decltype(V)> is satisfied, initializes mag with unit-magnitude<V>{}.
Otherwise, initializes mag with an unspecified value equal to V.
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template<std::intmax_t N, std::intmax_t D> requires(N > 0) constexpr UnitMagnitude auto mag_ratio = see below;
7
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Effects: Initializes mag_ratio with an unspecified value equal to .
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template<MagArg auto Base, int Num, int Den = 1> constexpr UnitMagnitude auto mag_power = pow<Num, Den>(mag<Base>);
8
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Constraints: Base is greater than 0.