[#mp_units-quantity-01-2constructor-06a]
= xref:mp_units.adoc[mp_units]::xref:mp_units/quantity-01.adoc[quantity]::quantity
:relfileprefix: ../../
:mrdocs:

Constructors

== Synopses

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

Default constructor


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:mp_units/quantity-01/2constructor-062.adoc[quantity]() = default;
----

[.small]#xref:mp_units/quantity-01/2constructor-062.adoc[_» more..._]#

Copy constructor


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:mp_units/quantity-01/2constructor-000.adoc[quantity](xref:mp_units/quantity-01.adoc[quantity] const& other) = default;
----

[.small]#xref:mp_units/quantity-01/2constructor-000.adoc[_» more..._]#

Copy constructor


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    auto R2,
    typename Rep2>
requires detail::QuantityConstructibleFrom<quantity, quantity<R2, Rep2>>
constexpr
explicit(!implicitly_convertible(get_quantity_spec(R2), quantity_spec) || !std::convertible_to<Rep2, rep>)
xref:mp_units/quantity-01/2constructor-00d.adoc[quantity](xref:mp_units/quantity-01.adoc[quantity<R2, Rep2>] const& q);
----

[.small]#xref:mp_units/quantity-01/2constructor-00d.adoc[_» more..._]#

Move constructor


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:mp_units/quantity-01/2constructor-01.adoc[quantity](xref:mp_units/quantity-01.adoc[quantity]&& other) = default;
----

[.small]#xref:mp_units/quantity-01/2constructor-01.adoc[_» more..._]#

Construct from `Q`


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<xref:mp_units/QuantityLike.adoc[QuantityLike] Q>
requires detail::QuantityConstructibleFrom<quantity, detail::quantity_like_type<Q>>
constexpr
explicit(quantity_like_traits<Q>::explicit_import || !std::convertible_to<detail::quantity_like_type<Q>, quantity<R, Rep>>)
xref:mp_units/quantity-01/2constructor-066.adoc[quantity](Q const& q);
----

[.small]#xref:mp_units/quantity-01/2constructor-066.adoc[_» more..._]#

Construct from `FwdValue`


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<typename FwdValue>
requires detail::DimensionlessOne<reference> && detail::ValuePreservingConstruction<rep, FwdValue>
constexpr
explicit(!std::convertible_to<FwdValue, rep>)
xref:mp_units/quantity-01/2constructor-09.adoc[quantity](FwdValue&& val);
----

[.small]#xref:mp_units/quantity-01/2constructor-09.adoc[_» more..._]#

Constructor


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    typename FwdValue,
    xref:mp_units/Reference.adoc[Reference] R2>
requires (equivalent(unit, get_unit(R2{}))) && detail::ValuePreservingConstruction<rep, FwdValue>
constexpr
xref:mp_units/quantity-01/2constructor-05.adoc[quantity](
    FwdValue&& val,
    R2);
----

[.small]#xref:mp_units/quantity-01/2constructor-05.adoc[_» more..._]#

Constructor


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    typename FwdValue,
    xref:mp_units/Reference.adoc[Reference] R2>
requires (!equivalent(unit, get_unit(R2{}))) &&
            detail::QuantityConstructibleFrom<quantity, quantity<R2{}, std::remove_cvref_t<FwdValue>>>
constexpr
xref:mp_units/quantity-01/2constructor-04.adoc[quantity](
    FwdValue&& val,
    R2);
----

[.small]#xref:mp_units/quantity-01/2constructor-04.adoc[_» more..._]#


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