text: /*
   * Copyright (c) 2013 David Wicks, sansumbrella.com
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or
   * without modification, are permitted provided that the following
   * conditions are met:
   *
   * Redistributions of source code must retain the above copyright
   * notice, this list of conditions and the following disclaimer.
   * Redistributions in binary form must reproduce the above copyright
   * notice, this list of conditions and the following disclaimer in the
   * documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #pragma once
  #include "pockets/puptent/PupTent.h"
  
  namespace pockets
  {
    namespace puptent
    {
      /**
       Expires:
       Stores time in seconds after which the entity holding the expires will be
       destroyed.
       If present, callback is executed immediately before the entity is destroyed
  
       future consideridations:
       have callback return a bool; if false, expiration is delayed.
       */
      struct Expires : Component<Expires>
      {
        Expires( double time=1.0, std::function<void ()> callback=nullptr ):
        time( time ),
        callback( callback )
        {}
        double                  time;
        std::function<void ()>  callback;
      };
  
      /**
       ExpiresSystem:
       Destroys an entity once the time in Expires runs out.
       */
      struct ExpiresSystem : public System<ExpiresSystem>, Receiver<ExpiresSystem>
      {
        void update( EntityManagerRef es, EventManagerRef events, double dt ) override;
      private:
      };
    }
  }