optional.hh

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#pragma once
 
#if __cplusplus <= 201402L
#include <boost/optional.hpp>
#else
#include <optional>
#endif
 
namespace HEJ {
 
#if __cplusplus <= 201402L
  template<typename T>
  using optional = boost::optional<T>;
#else
  template<typename T>
  using optional = std::optional<T>;
#endif
}