di::vocab::OptionalStorage Concept Reference

#include <di/vocab/optional/optional_storage.h>

Concept definition

template<typename Storage, typename T>
concept di::vocab::OptionalStorage =  requires(Storage& storage, T&& value) {
    { is_nullopt(util::as_const(storage)) } -> concepts::SameAs<bool>;
    { set_nullopt(storage) };
    { get_value(storage) };
    { get_value(util::as_const(storage)) };
    { get_value(util::move(storage)) };
    { get_value(util::move(util::as_const(storage))) };
} && concepts::ConstructibleFrom<Storage, NullOpt>