cdo.h

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00001 /*****************************************************************************/
00002 /*!
00003  * \file cdo.h
00004  * 
00005  * Author: Clark Barrett
00006  * 
00007  * Created: Wed Feb 12 17:27:43 2003
00008  *
00009  * <hr>
00010  *
00011  * License to use, copy, modify, sell and/or distribute this software
00012  * and its documentation for any purpose is hereby granted without
00013  * royalty, subject to the terms and conditions defined in the \ref
00014  * LICENSE file provided with this distribution.
00015  * 
00016  * <hr>
00017  * 
00018  */
00019 /*****************************************************************************/
00020 
00021 #ifndef _cvc3__include__cdo_h_
00022 #define _cvc3__include__cdo_h_
00023 
00024 #include "context.h"
00025 
00026 namespace CVC3 {
00027 
00028 ///////////////////////////////////////////////////////////////////////////////
00029 //                                                                           //
00030 // Class: CDO (Context Dependent Object)             //
00031 // Author: Clark Barrett                                                     //
00032 // Created: Wed Feb 12 17:28:25 2003               //
00033 // Description: Generic templated class for an object which must be saved    //
00034 //              and restored as contexts are pushed and popped.  Requires    //
00035 //              that operator= be defined for the data class.                //
00036 //                                                                           //
00037 ///////////////////////////////////////////////////////////////////////////////
00038 template <class T>
00039 class CDO :public ContextObj {
00040   T d_data;
00041 
00042   virtual ContextObj* makeCopy(ContextMemoryManager* cmm)
00043     { return new(cmm) CDO<T>(*this); }
00044   virtual void restoreData(ContextObj* data) {
00045     d_data = ((CDO<T>*)data)->d_data;
00046   }
00047   virtual void setNull(void) { d_data = T(); }
00048 
00049   // Disable copy constructor and operator=
00050   // If you need these, use smartcdo instead
00051   CDO(const CDO<T>& cdo): ContextObj(cdo), d_data(cdo.d_data) { }
00052   CDO<T>& operator=(const CDO<T>& cdo) {}
00053 
00054 public:
00055   CDO(Context* context) : ContextObj(context)
00056     { IF_DEBUG(setName("CDO")); }
00057   CDO(Context* context, const T& data, int scope = -1)
00058     : ContextObj(context) {
00059     IF_DEBUG(setName("CDO"));     
00060     set(data, scope);
00061   }
00062   ~CDO() {}
00063   void set(const T& data, int scope=-1) { makeCurrent(scope); d_data = data; }
00064   const T& get() const { return d_data; }
00065   operator T() { return get(); }
00066   CDO<T>& operator=(const T& data) { set(data); return *this; }
00067   
00068 };
00069 
00070 }
00071 
00072 #endif

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