optional.hh

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#ifndef DUNE_COMMON_STD_OPTIONAL_HH
#define DUNE_COMMON_STD_OPTIONAL_HH
 
#include <cassert>
#include <functional>
#include <stdexcept>
#include <type_traits>
#include <utility>
 
#include <optional>
 
#warning dune/common/std/optional.hh is deprecated and will be removed after Dune 2.8.\
 Include <optional> instead
 
namespace Dune
{
 
  namespace Std
  {
    // In case of C++ standard >= 17 we forward optionals into our namespace
    template< class T >
    using optional = std::optional< T >;
 
    using nullopt_t = std::nullopt_t;
    using in_place_t = std::in_place_t;
 
    namespace
    {
      const std::nullopt_t nullopt = std::nullopt;
      const std::in_place_t in_place =  std::in_place;
    } // anonymous namespace
 
    using bad_optional_access = std::bad_optional_access;
 
  } // namespace Std
 
} // namespace Dune
 
#endif // #ifndef DUNE_COMMON_STD_OPTIONAL_HH