Index.h

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/*
 * Copyright (c) 2018 Samsung Electronics Co., Ltd. All Rights Reserved
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#ifndef __ONERT_UTIL_INDEX_H__
#define __ONERT_UTIL_INDEX_H__
 
#include <functional>
#include <limits>
#include <stdint.h>
#include <string>
 
namespace onert
{
namespace util
{
 
template <typename T, typename DummyTag> class Index
{
private:
  static const T UNDEFINED = std::numeric_limits<T>::max();
 
public:
  explicit Index(void) : _index{UNDEFINED} {}
  explicit Index(const T o) : _index{o} {}
  Index(const Index &o) = default;
 
  Index &operator=(const T o)
  {
    _index = o;
    return *this;
  }
 
  Index &operator=(const Index &o) = default;
 
  bool operator==(T o) const { return _index == o; }
  bool operator==(const Index &o) const { return _index == o._index; }
  bool operator!=(T o) const { return !(*this == o); }
  bool operator!=(const Index &o) const { return !(*this == o); }
 
  Index operator++(int)
  {
    Index temp = *this;
    _index++;
    return temp;
  }
 
  bool valid() const { return _index != UNDEFINED; }
  bool undefined() const { return _index == UNDEFINED; }
  T value() const { return _index; }
 
  bool operator<(const Index &I) const { return value() < I.value(); }
 
  static T max() { return UNDEFINED - 1; }
 
private:
  T _index;
};
 
} // namespace util
} // namespace onert
 
namespace std
{
 
template <typename T, typename Tag> struct hash<::onert::util::Index<T, Tag>>
{
  size_t operator()(const ::onert::util::Index<T, Tag> &index) const noexcept
  {
    return hash<T>()(index.value());
  }
};
 
} // namespace std
 
#endif // __ONERT_UTIL_INDEX_H__