[#mp_units-delta]
= xref:mp_units.adoc[mp_units]::delta
:relfileprefix: ../
:mrdocs:

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<xref:mp_units/Reference.adoc[Reference] auto R>
[[nodiscard]]
constexpr
xref:mp_units/quantity-01.adoc[quantity<R{}, Rep>]
delta(FwdRep&& lhs);
----

== Description

[NOTE]
====
This function object does not participate in argument-dependent lookup. Taking the address of this function object is undefined behavior.
====


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