Return true if the specified lhs optional object is ordered before the specified rhs, and false otherwise. lhs is ordered before rhs if lhs is disengaged or lhs.value() is ordered before rhs. This function can be called in constant expressions only if t_LHS_TYPE is not allocator-aware.
Declared in <bslstl_optional.h>
template<
class t_LHS_TYPE,
class t_RHS_TYPE>
constexpr
bool
operator<(
bsl::optional<t_LHS_TYPE> const& lhs,
t_RHS_TYPE const& rhs);