[#mp_units-quantity_point-08-operator_dec-0f]
= xref:mp_units.adoc[mp_units]::xref:mp_units/quantity_point-08.adoc[quantity_point]::operator‐‐
:relfileprefix: ../../
:mrdocs:

Decrement operators

== Synopses

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

Pre‐decrements the underlying quantity from the origin.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
xref:mp_units/quantity_point-08.adoc[quantity_point]&
xref:mp_units/quantity_point-08/operator_dec-0a.adoc[operator‐‐]() &
requires requires { ‐‐quantity_from_origin_is_an_implementation_detail_; };
----

[.small]#xref:mp_units/quantity_point-08/operator_dec-0a.adoc[_» more..._]#

Post‐decrements the underlying quantity from the origin.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[nodiscard]]
constexpr
xref:mp_units/quantity_point-08.adoc[quantity_point]
xref:mp_units/quantity_point-08/operator_dec-02.adoc[operator‐‐](int unused_tag)
requires requires { quantity_from_origin_is_an_implementation_detail_‐‐; };
----

[.small]#xref:mp_units/quantity_point-08/operator_dec-02.adoc[_» more..._]#

== Return Value

* `*this`, after the decrement.
* A quantity point holding the value of `*this` before the decrement.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *unused_tag*
| An unused tag parameter that distinguishes this overload as the post‐decrement operator.
|===


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