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

Policy that checks the value is within [min, max]and reports violations.

== Synopsis

Declared in `<mp‐units/overflow_policies.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<xref:mp_units/Quantity.adoc[Quantity] Q>
struct check_in_range;
----

== Description

If the quantity's representation type has a `constraint_violation_handler` specialization, the handler's `on_violation()` is called on out‐of‐bounds values (providing guaranteed enforcement regardless of build mode). Otherwise, falls back to `MP_UNITS_EXPECTS`, which may be disabled in release builds.

Example:

[,cpp]
----
{cpp}
 // With constrained<double, throw_policy> rep → throws std::domain_error on violation
 // With plain double rep → asserts via MP_UNITS_EXPECTS (may be no-op in release)
 template<>
 constexpr auto quantity_bounds<equator> = check_in_range{-90 * deg, 90 * deg};
----
== Member Functions

[cols=1]
|===
| Name
| xref:mp_units/check_in_range/operator_call.adoc[`operator()`] 
|===

== Data Members

[cols=1]
|===
| Name
| xref:mp_units/check_in_range/max.adoc[`max`] 
| xref:mp_units/check_in_range/min.adoc[`min`] 
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#