[#bsl-operator_lt-01f]
= xref:bsl.adoc[bsl]::operator<
:relfileprefix: ../
:mrdocs:

Compare a `std::optional` with a `bsl::optional` using less‐than.

== Synopsis

Declared in `<bslstl_optional.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class t_LHS_TYPE,
    class t_RHS_TYPE>
constexpr
bool
operator<(
    std::optional<t_LHS_TYPE> const& lhs,
    xref:bsl/optional-072.adoc[bsl::optional<t_RHS_TYPE>] const& rhs);
----


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