5 Quantities and units library [quantities]

5.6 Quantity [qty]

5.6.8 Conversion operations [qty.conv.ops]

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template<typename V_, std::constructible_from<Rep> Value = std::remove_cvref_t<V_>> requires(unit == ::mp_units::one) explicit operator V_() const & noexcept;
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Returns: numerical-value.
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template<typename Q_, QuantityLike Q = std::remove_cvref_t<Q_>> requires QuantityConvertibleTo<quantity, quantity-like-type<Q>> constexpr explicit(see below) operator Q_() const noexcept(see below);
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Effects: Equivalent to: return quantity_like_traits<Q>::from_numerical_value( numerical_value_in(get_unit(quantity_like_traits<Q>::reference)));
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Remarks: The expression inside explicit is equivalent to: quantity_like_traits<Q>::explicit_export || !std::convertible_to<Rep, typename quantity_like_traits<Q>::rep>
The exception specification is equivalent to: noexcept(quantity_like_traits<Q>::from_numerical_value(numerical-value)) && std::is_nothrow_copy_constructible_v<rep>