Return true if the specified lhs is ordered before the specified rhs optional object 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_RHS_TYPE is not allocator-aware.
Declared in <bslstl_optional.h>
template<
class t_LHS_TYPE,
class t_RHS_TYPE>
constexpr
bool
operator<=(
t_LHS_TYPE const& lhs,
bsl::optional<t_RHS_TYPE> const& rhs);