[#mp_units-quantity_point-08-2conversion-08]
= xref:mp_units.adoc[mp_units]::xref:mp_units/quantity_point-08.adoc[quantity_point]::operator QP_
:relfileprefix: ../../
:mrdocs:

Converts this lvalue quantity point to an external quantity‐point‐like type via `quantity_point_like_traits`.

== Synopsis

Declared in `<mp‐units/framework/quantity_point.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    typename QP_,
    xref:mp_units/QuantityPointLike.adoc[QuantityPointLike] QP = std::remove_cvref_t<QP_>>
requires (point_origin == quantity_point_like_traits<QP>::point_origin) &&
            std::convertible_to<quantity_type, quantity<quantity_point_like_traits<QP>::reference,
                                                        typename quantity_point_like_traits<QP>::rep>>
[[nodiscard]]
constexpr
explicit(quantity_point_like_traits<QP>::explicit_export || !std::convertible_to<quantity_type, quantity<quantity_point_like_traits<QP>::reference, typename quantity_point_like_traits<QP>::rep>>)
operator QP_() const & noexcept(/* see-below */);
----

== Exception specification

This function is potentially-throwing unless `noexcept(quantity_point_like_traits<QP>::from_numerical_value(this‐>quantity_from_origin_is_an_implementation_detail_.numerical_value_is_an_implementation_detail_)) && std::is_nothrow_copy_constructible_v<rep>`.

== Return Value

The value produced by `quantity_point_like_traits<QP>::from_numerical_value`.

[NOTE]
====
The return value https://en.cppreference.com/cpp/language/attributes/nodiscard[should not be discarded^].
====

[.small]#Created with https://www.mrdocs.com[MrDocs]#