[#beman-optional-operator_lt-0d]
= xref:beman.adoc[beman]::xref:beman/optional.adoc[optional]::operator<
:relfileprefix: ../../
:mrdocs:

Orders two optionals with less‐than.

== Synopsis

Declared in `<beman/optional/optional.hpp>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    typename T,
    typename U>
constexpr
bool
operator<(
    xref:beman/optional/optional-03.adoc[optional<T>] const& lhs,
    xref:beman/optional/optional-03.adoc[optional<U>] const& rhs)
requires detail::optional_lt_rel<T, U>;
----

== Return Value

`true` if `lhs` orders before `rhs;` a disengaged optional orders before any engaged one.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *lhs*
| The left‐hand optional.
| *rhs*
| The right‐hand optional.
|===


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