Returns the contained value if there is one, otherwise returns u. Synopsis Declared in <beman/optional/optional.hpp> template<class U = std::remove_cv_t<T>> requires (std::is_object_v<T> && !std::is_array_v<T>) constexpr std::decay_t<T> value_or(U&& u) const; Return Value std::remove_cv_t<T> Template Parameters Name Description U The type of the alternate value Parameters Name Description u The value to return in the empty case