[#mp_units-utility-constrained-operator_dec-09]
= xref:mp_units.adoc[mp_units]::xref:mp_units/utility.adoc[utility]::xref:mp_units/utility/constrained.adoc[constrained]::operator‐‐
:relfileprefix: ../../../
:mrdocs:

Post‐decrements the wrapped value.

== Synopsis

Declared in `<mp‐units/utility/constrained.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
xref:mp_units/utility/constrained.adoc[constrained<decltype(std::declval<T&>()‐‐), ErrorPolicy>]
operator‐‐(int tag);
----

== Return Value

the value before decrementing, wrapped in `constrained`

== Parameters

[cols="1,4"]
|===
| Name| Description
| *tag*
| unused; disambiguates this postfix overload from the prefix `operator‐‐()`
|===


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