BLI_vector_set_slots.hh

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/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
 
#pragma once
 
#include "BLI_sys_types.h"
 
namespace blender {
 
template<typename Key> class SimpleVectorSetSlot {
 private:
#define s_is_empty -1
#define s_is_removed -2
 
  int64_t state_ = s_is_empty;
 
 public:
  bool is_occupied() const
  {
    return state_ >= 0;
  }
 
  bool is_empty() const
  {
    return state_ == s_is_empty;
  }
 
  int64_t index() const
  {
    BLI_assert(this->is_occupied());
    return state_;
  }
 
  template<typename ForwardKey, typename IsEqual>
  bool contains(const ForwardKey &key,
                const IsEqual &is_equal,
                uint64_t UNUSED(hash),
                const Key *keys) const
  {
    if (state_ >= 0) {
      return is_equal(key, keys[state_]);
    }
    return false;
  }
 
  void occupy(int64_t index, uint64_t UNUSED(hash))
  {
    BLI_assert(!this->is_occupied());
    state_ = index;
  }
 
  void update_index(int64_t index)
  {
    BLI_assert(this->is_occupied());
    state_ = index;
  }
 
  void remove()
  {
    BLI_assert(this->is_occupied());
    state_ = s_is_removed;
  }
 
  bool has_index(int64_t index) const
  {
    return state_ == index;
  }
 
  template<typename Hash> uint64_t get_hash(const Key &key, const Hash &hash) const
  {
    BLI_assert(this->is_occupied());
    return hash(key);
  }
 
#undef s_is_empty
#undef s_is_removed
};
 
template<typename Key> struct DefaultVectorSetSlot;
 
template<typename Key> struct DefaultVectorSetSlot {
  using type = SimpleVectorSetSlot<Key>;
};
 
}  // namespace blender