3#ifndef DUNE_FUNCTIONS_COMMON_OPTIONAL_HH
4#define DUNE_FUNCTIONS_COMMON_OPTIONAL_HH
6#warning dune/functions/common/optional.hh is deprecated and will be removed after Dune 2.8.\
7 Include <optional> instead
Definition: polynomial.hh:10
std::optional< T > Optional
Definition: optional.hh:14