State.h

/*********************************************************************
* Software License Agreement (BSD License)
*
*  Copyright (c) 2010, Rice University
*  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.
*   * Neither the name of the Rice University nor the names of its
*     contributors may be used to endorse or promote products derived
*     from this software without specific prior written permission.
*
*  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 OWNER 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.
*********************************************************************/
 
/* Author: Ioan Sucan */
 
#ifndef OMPL_BASE_STATE_
#define OMPL_BASE_STATE_
 
#include <boost/concept_check.hpp>
 
namespace ompl
{
    namespace base
    {
        class State
        {
        private:
            State(const State &) = delete;
 
            const State &operator=(const State &) = delete;
 
        protected:
            State() = default;
 
            virtual ~State() = default;
 
        public:
            template <class T>
            const T *as() const
            {
                BOOST_CONCEPT_ASSERT((boost::Convertible<T *, State *>));
 
                return static_cast<const T *>(this);
            }
 
            template <class T>
            T *as()
            {
                BOOST_CONCEPT_ASSERT((boost::Convertible<T *, State *>));
 
                return static_cast<T *>(this);
            }
        };
 
        class CompoundState : public State
        {
        public:
            CompoundState() = default;
 
            ~CompoundState() override = default;
 
            template <class T>
            const T *as(unsigned int index) const
            {
                BOOST_CONCEPT_ASSERT((boost::Convertible<T *, State *>));
 
                return static_cast<const T *>(components[index]);
            }
 
            template <class T>
            T *as(const unsigned int index)
            {
                BOOST_CONCEPT_ASSERT((boost::Convertible<T *, State *>));
 
                return static_cast<T *>(components[index]);
            }
 
            const State *operator[](unsigned int i) const
            {
                return components[i];
            }
 
            State *operator[](unsigned int i)
            {
                return components[i];
            }
 
            State **components{nullptr};
        };
    }
}
 
#endif