boost_backport_string_view.hpp

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#ifndef MLPACK_CORE_BOOST_BACKPORT_STRING_VIEW_HPP
#define MLPACK_CORE_BOOST_BACKPORT_STRING_VIEW_HPP

#include <boost/version.hpp>
#include <boost/functional/hash.hpp>

#if BOOST_VERSION < 106100
  // Backported unordered_map.
  #include "mlpack/core/boost_backport/string_view.hpp"
#else
  // Boost's version.
  #include <boost/utility/string_view.hpp>
#endif

#if BOOST_VERSION < 106900
  namespace boost
  {
    template<>
    struct hash<boost::string_view>
    {
      std::size_t operator()(boost::string_view str) const
      {
        return boost::hash_range(str.begin(), str.end());
      }
    };
  }
#endif

#endif // MLPACK_CORE_BOOST_BACKPORT_STRING_VIEW_HPP