beman::optional::operator!=

Inequality operators

Synopses

Declared in <beman/optional/optional.hpp>

Compares two optionals for inequality.

template<
    typename T,
    typename U>
constexpr
bool
operator!=(
    optional<T> const& lhs,
    optional<U> const& rhs)
requires detail::optional_ne_rel<T, U>;

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Compares an optional against a value for inequality.

template<
    typename T,
    typename U>
constexpr
bool
operator!=(
    optional<T> const& lhs,
    U const& rhs)
requires (!detail::is_optional<U>) && detail::optional_ne_rel<T, U>;

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Compares a value against an optional for inequality.

template<
    typename T,
    typename U>
constexpr
bool
operator!=(
    T const& lhs,
    optional<U> const& rhs)
requires (!detail::is_optional<T>) && detail::optional_ne_rel<T, U>;

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Return Value

true if the operands are not equal.
true if lhs is disengaged or its contained value differs from rhs.
true if rhs is disengaged or lhs differs from its contained value.

Parameters

Name

Description

lhs

The left‐hand optional.

rhs

The right‐hand optional.

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