mp-units/src/include/units/bits/hacks.h

// The MIT License (MIT)
//
// Copyright (c) 2018 Mateusz Pusz
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
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//
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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#pragma once

#include <units/bits/config.h>
#include <experimental/ranges/concepts>

namespace std {

#ifndef UNITS_HAS_STD_TYPE_IDENTITY

  // type_identity
  template<typename T>
  struct type_identity { using type = T; };

  template<typename T>
  using type_identity_t = typename type_identity<T>::type;

#endif // UNITS_HAS_STD_TYPE_IDENTITY

  // concepts
  using experimental::ranges::Same;
  using experimental::ranges::Integral;
  using experimental::ranges::DerivedFrom;
  using experimental::ranges::Regular;
  using experimental::ranges::StrictTotallyOrdered;
  using experimental::ranges::ConvertibleTo;

}