Optional.hpp

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#ifndef DART_COMMON_OPTIONAL_HPP_
#define DART_COMMON_OPTIONAL_HPP_
 
#if __cplusplus >= 201703L
#  include <optional>
#else
#  include <boost/optional.hpp>
#endif
 
namespace dart {
namespace common {
 
#if __cplusplus >= 201703L
template <class T>
using optional = std::optional<T>;
#else
template <class T>
using optional = boost::optional<T>;
#endif
 
} // namespace common
} // namespace dart
 
#endif // DART_COMMON_OPTIONAL_HPP_