trackable.c++

/**
 * The MIT License (MIT)
 *
 * Copyright © 2017-2020 Ruben Van Boxem
 *
 * 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.
 **/

/*
 * Trackable
 * Lifetime management base class for classes that connect to signals.
 * Only needed if e.g. a signal from outside the class connects to e.g. a member function.
 */

#include "core/trackable.h++"

#include <vector>

namespace skui::core
{
  trackable::~trackable()
  {
    // trackable_deleted will most likely erase elements in this->trackers, so iterate through a copy made up front.
    const std::vector<implementation::tracker*> trackers_copy(trackers.begin(), trackers.end());
    for(auto tracker : trackers_copy)
    {
      tracker->trackable_deleted(this);
    }
  }

  trackable::trackable(const trackable& other)
    : trackers{other.trackers}
  {
    for(auto tracker : trackers)
    {
      tracker->trackable_copied(&other, this);
    }
  }

  trackable::trackable(trackable&& other) noexcept
    : trackers{std::move(other.trackers)}
  {
    for(auto tracker : trackers)
    {
      tracker->trackable_moved(&other, this);
    }
  }

  void trackable::track(implementation::tracker* tracker) const
  {
    const std::lock_guard lock(trackers_mutex);
    trackers.insert(tracker);
  }

  void trackable::untrack(implementation::tracker* tracker) const
  {
    const std::lock_guard lock(trackers_mutex);
    trackers.erase(tracker);
  }
}