[#mp_units-utility-constrained-operator_dec-0d8]
= xref:mp_units.adoc[mp_units]::xref:mp_units/utility.adoc[utility]::xref:mp_units/utility/constrained.adoc[constrained]::operator‐‐
:relfileprefix: ../../../
:mrdocs:

Pre‐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]&
operator‐‐()
requires requires(T& v) {
      { ‐‐v } ‐> std::same_as<T&>;
    };
----

== Return Value

a reference to `*this`, after decrementing


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