mrdocs::operator<

Less-than operators

Synopses

Checks if the left Optional is less than the right Optional. Returns true if the right is engaged and either the left is disengaged or its value is less.

template<
    typename T,
    typename U>
constexpr
/* implementation-defined */
operator<(
    Optional<T> const& lhs,
    Optional<U> const& rhs);

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Checks if the Optional is less than a value. Returns true if the Optional is disengaged or its value is less than rhs.

template<
    typename T,
    typename U>
requires (!detail::isOptionalV<U>)
[[nodiscard]]
constexpr
/* implementation-defined */
operator<(
    Optional<T> const& lhs,
    U const& rhs);

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Checks if a value is less than an engaged Optional. Returns true if the Optional is engaged and lhs is less than its value.

template<
    typename T,
    typename U>
requires (!detail::isOptionalV<T>)
[[nodiscard]]
constexpr
/* implementation-defined */
operator<(
    T const& lhs,
    Optional<U> const& rhs);

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Return Value

• true if lhs is less than rhs according to the described rules; otherwise, false.
• true if the optional is disengaged or less than rhs; otherwise, false.
• true if the optional is engaged and lhs is less than its value; otherwise, false.