beman::optional::optional::or_else

Returns an optional containing the contained value if it has one, or the result of applying f to the optional if it does not.

Synopsis

Declared in <beman/optional/optional.hpp>

template<class F>
constexpr
optional<T>
or_else(F&& f) const &
requires (std::invocable<F> && std::copy_constructible<T>);

Name	Description
F	An invocable type returning an optional.

Name	Description
f	The invocable to call if the optional is disengaged.