text: /****************************************************************************
  **
  ** This file is part of the Ponder library, formerly CAMP.
  **
  ** The MIT License (MIT)
  **
  ** Copyright (C) 2009-2014 TEGESO/TEGESOFT and/or its subsidiary(-ies) and mother company.
  ** Copyright (C) 2015-2019 Nick Trout.
  **
  ** 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.
  **
  ****************************************************************************/
  
  namespace ponder {
      
  template <typename T>
  UserObject::UserObject(const T& object)
      :   m_class(&classByType<T>())
  {
      typedef detail::ReferenceTraits<const T> Traits;
      typedef detail::ObjectHolderByCopy<typename Traits::DataType> Holder;
      m_holder.reset(new Holder(Traits::getPointer(object)));
  }
  
  template <typename T>
  UserObject::UserObject(T* object)
      :   m_class(&classByType<T>())
  {
      typedef detail::ReferenceTraits<T> Traits;
      static_assert(!Traits::isRef, "Cannot make reference to reference");
      
      typedef typename std::conditional<std::is_const<T>::value,
      detail::ObjectHolderByConstRef<typename Traits::DataType>,
      detail::ObjectHolderByRef<typename Traits::DataType>>::type Holder;
      
      m_holder.reset(new Holder(object));
  }
  
  template <typename T>
  typename detail::ReferenceTraits<T>::ReferenceType UserObject::get() const
  {
      // Make sure that we have a valid internal object
      void *ptr = pointer();
      if (!ptr)
          PONDER_ERROR(NullObject(m_class));
  
      // Get the metaclass of T (we use classByTypeSafe because it may not exist)
      const Class *targetClass = classByTypeSafe<T>();
      if (!targetClass)
          PONDER_ERROR(ClassNotFound("unknown"));
  
      // Apply the proper offset to the pointer (solves multiple inheritance issues)
      ptr = classCast(ptr, *m_class, *targetClass);
  
      return detail::ReferenceTraits<T>::get(ptr);
  }
  
  template <typename T>
  UserObject UserObject::makeRef(T& object)
  {
      typedef detail::ReferenceTraits<T> RefTraits;
      static_assert(!RefTraits::isRef, "Cannot make reference to reference");
  
      typedef typename std::conditional<std::is_const<T>::value,
                   detail::ObjectHolderByConstRef<typename RefTraits::DataType>,
                   detail::ObjectHolderByRef<typename RefTraits::DataType>>::type Holder;
  
      return UserObject(&classByObject(object), new Holder(RefTraits::getPointer(object)));
  }
  
  template <typename T>
  inline UserObject UserObject::makeRef(T* object)
  {
      return makeRef(*object);
  }
  
  template <typename T>
  UserObject UserObject::makeCopy(const T& object)
  {
      typedef detail::ReferenceTraits<const T> Traits;
      typedef detail::ObjectHolderByCopy<typename Traits::DataType> Holder;
      return UserObject(&classByType<T>(), new Holder(Traits::getPointer(object)));
  }
  
  template <typename T>
  inline T& UserObject::ref() const
  {
      return *reinterpret_cast<T*>(m_holder->object());
  }
  
  template <typename T>
  inline const T& UserObject::cref() const
  {
      return *reinterpret_cast<T*>(m_holder->object());
  }
  
  } // namespace ponder
  