Return true if the specified lhs optional object is ordered before the specified rhs or lhs and rhs have the same value, and false otherwise. (See operator< and operator==.) 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);