bsl::operator<=>

Perform a three‐way comparison of the operands.

Synopsis

Declared in <bslstl_optional.h>

template<
    class t_LHS,
    three_way_comparable_with<t_LHS> t_RHS>
constexpr
compare_three_way_result_t<t_LHS, t_RHS>
operator<=>(
    bsl::optional<t_LHS> const& lhs,
    bsl::optional<t_RHS> const& rhs);

Description

Perform a three‐way comparison of the specified lhs and the specified rhs objects by using the comparison operators of t_LHS and t_RHS; return the result of that comparison. This function can be called in constant expressions only if neither t_LHS nor t_RHS is allocator‐aware.

Return Value

result of the three‐way comparison

Parameters

Name

Description

lhs

left‐hand operand

rhs

right‐hand operand

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