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

Returns the epsilon of the quantity

== Synopsis

Declared in `<mp‐units/math.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    typename Rep,
    xref:mp_units/Reference.adoc[Reference] R>
requires RepresentationOf<Rep, get_quantity_spec(R{})> && requires { std::numeric_limits<Rep>::epsilon(); }
[[deprecated, nodiscard]]
constexpr
xref:mp_units/quantity-01.adoc[quantity<R{}, Rep>]
epsilon(R r) noexcept;
----

== Description

The returned value is defined by a .

== Return Value

Quantity The epsilon value for quantity's representation type

== Template Parameters

[cols=2]
|===
| Name
| Description
| *Q*
| Quantity type being the base of the operation
|===


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