/******************************************************************************
 * The MIT License (MIT)
 *
 * Copyright (c) 2019-2022 Baldur Karlsson
 *
 * 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 copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 ******************************************************************************/

#pragma once

template <typename BitType, typename FlagType, typename SignedType>
class BitFlagIterator
{
private:
  FlagType flags;

public:
  inline BitFlagIterator() : flags(0) {}
  inline BitFlagIterator(FlagType mask) : flags(mask) {}
  inline BitFlagIterator(FlagType mask, BitType bit) : flags(mask & ~(bit - 1)) {}
  inline BitFlagIterator(const BitFlagIterator &o) : flags(o.flags) {}
  static inline BitFlagIterator begin(FlagType mask) { return BitFlagIterator(mask); }
  static inline BitFlagIterator end() { return BitFlagIterator(0); }
  inline BitType operator*() const { return (BitType)(flags & (FlagType)(-(SignedType)flags)); }
  inline BitFlagIterator &operator++()
  {
    flags ^= **this;
    return *this;
  }
  inline bool operator==(const BitFlagIterator &rhs) const { return flags == rhs.flags; }
  inline bool operator!=(const BitFlagIterator &rhs) const { return flags != rhs.flags; }
  inline BitFlagIterator &operator=(const BitFlagIterator &rhs)
  {
    flags = rhs.flags;
    return *this;
  }
};