5 Quantities and units library [quantities]

5.7 Quantity point [qty.pt]

5.7.9 Conversion operations [qty.pt.conv.ops]

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template<typename QP_, QuantityPointLike QP = std::remove_cvref_t<QP_>> requires see below constexpr explicit(see below) operator QP_() const & noexcept(see below); template<typename QP_, QuantityPointLike QP = std::remove_cvref_t<QP_>> requires see below constexpr explicit(see below) operator QP_() && noexcept(see below);
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Let Traits be quantity_point_like_traits<QP>.
Let result-expr be Traits::from_numerical_value(std::move(quantity-from-origin).numerical-value)
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Returns: result-expr.
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Remarks: The expression in the requires-clause is equivalent to: (point_origin == Traits::point_origin) && std::convertible_to<quantity_type, quantity<Traits::reference, typename Traits::rep>>
The expression inside explicit is equivalent to: Traits::explicit_export || !std::convertible_to<quantity_type, quantity<Traits::reference, typename Traits::rep>>
Let T be std​::​is_nothrow_copy_constructible_v for the first signature, and std​::​is_nothrow_move_constructible_v for the second signature.
The exception specification is equivalent to: noexcept(result-expr) && T<rep>