Return whether the left‐hand operand is before or equal to the right.

Synopsis

Declared in <bslstl_optional.h>

template<
    class t_LHS_TYPE,
    class t_RHS_TYPE>
constexpr
bool
operator<=(
    bsl::optional<t_LHS_TYPE> const& lhs,
    std::optional<t_RHS_TYPE> const& rhs);

Description

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==.) Note that this function will fail to compile if t_LHS_TYPE and t_RHS_TYPE are not compatible. These functions can be called in constant expressions only if the bsl::optional's value type is not allocator‐aware.

Return Value

true if lhs is ordered before or equal to rhs, and false otherwise

Parameters

Name

Description

lhs

left‐hand operand

rhs

right‐hand operand

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