[#mp_units-quantity_point-08-2constructor-09]
= xref:mp_units.adoc[mp_units]::xref:mp_units/quantity_point-08.adoc[quantity_point]::quantity_point
:relfileprefix: ../../
:mrdocs:

Converting constructor from a quantity point anchored to a different absolute point origin.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<xref:mp_units/QuantityPoint.adoc[QuantityPoint] QP>
requires (!QuantityPointOf<QP, absolute_point_origin>) && requires(const QP& src) {
      { src.point_for(point_origin) } ‐> QuantityPointOf<point_origin>;
      quantity_type{src.point_for(point_origin) ‐ point_origin};
    }
[[nodiscard]]
constexpr
explicit
quantity_point(QP const& qp);
----

== Description

Re‐expresses `qp` at `point_origin` via `point_for`, which requires a `frame_projection` between the two absolute point origins to be defined.

== Return Value

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

[cols="1,4"]
|===
| Name| Description
| *qp*
| the source quantity point to convert from
|===


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