[#mp_units-utility-operator_plus-0b]
= xref:mp_units.adoc[mp_units]::xref:mp_units/utility.adoc[utility]::operator+
:relfileprefix: ../../
:mrdocs:

Adds a `safe_int` to a floating‐point value.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<typename U>
requires treat_as_floating_point<U>
[[nodiscard]]
constexpr
auto
operator+(
    U lhs,
    xref:mp_units/utility/safe_int-07.adoc[safe_int] rhs)
requires requires { lhs + static_cast<U>(rhs.value_); };
----

[NOTE]
====
This function is a https://en.cppreference.com/w/cpp/language/friend[hidden friend] of xref:mp_units/utility/safe_int-07.adoc[safe_int], declared only inside that class: it can be found only through argument-dependent lookup.
====

== Return Value

the sum of `lhs` and the wrapped value

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

[cols="1,4"]
|===
| Name| Description
| *U*
| a floating‐point‐like type (`treat_as_floating_point<U>` is `true`)
|===

== Parameters

[cols="1,4"]
|===
| Name| Description
| *lhs*
| the floating‐point value
| *rhs*
| the `safe_int` to add
|===


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