[#mp_units-utility-detail-get_arg]
= xref:mp_units.adoc[mp_units]::xref:mp_units/utility.adoc[utility]::xref:mp_units/utility/detail.adoc[detail]::get_arg
:relfileprefix: ../../../
:mrdocs:

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    typename Context,
    typename ID>
[[nodiscard]]
constexpr
decltype(ctx.arg(id))
get_arg(
    Context& ctx,
    ID id);
----

== Return Value

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

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