00001 /* +---------------------------------------------------------------------------+ 00002 | The Mobile Robot Programming Toolkit (MRPT) C++ library | 00003 | | 00004 | http://www.mrpt.org/ | 00005 | | 00006 | Copyright (C) 2005-2011 University of Malaga | 00007 | | 00008 | This software was written by the Machine Perception and Intelligent | 00009 | Robotics Lab, University of Malaga (Spain). | 00010 | Contact: Jose-Luis Blanco <jlblanco@ctima.uma.es> | 00011 | | 00012 | This file is part of the MRPT project. | 00013 | | 00014 | MRPT is free software: you can redistribute it and/or modify | 00015 | it under the terms of the GNU General Public License as published by | 00016 | the Free Software Foundation, either version 3 of the License, or | 00017 | (at your option) any later version. | 00018 | | 00019 | MRPT is distributed in the hope that it will be useful, | 00020 | but WITHOUT ANY WARRANTY; without even the implied warranty of | 00021 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | 00022 | GNU General Public License for more details. | 00023 | | 00024 | You should have received a copy of the GNU General Public License | 00025 | along with MRPT. If not, see <http://www.gnu.org/licenses/>. | 00026 | | 00027 +---------------------------------------------------------------------------+ */ 00028 #ifndef CReferencedMemBlock_H 00029 #define CReferencedMemBlock_H 00030 00031 #include <mrpt/utils/utils_defs.h> 00032 #include <utility> 00033 00034 namespace mrpt 00035 { 00036 namespace utils 00037 { 00038 /** Represents a memory block (via "void*") that can be shared between several objects through copy operator (=). 00039 * It keeps the reference count and only when it comes to zero, the memory block is really freed. 00040 * \ingroup mrpt_base_grp 00041 */ 00042 class BASE_IMPEXP CReferencedMemBlock : public stlplus::smart_ptr< vector_byte > 00043 { 00044 public: 00045 /** Constructor with an optional size of the memory block */ 00046 CReferencedMemBlock(size_t mem_block_size = 0 ); 00047 00048 /** Destructor, calls dereference_once. */ 00049 virtual ~CReferencedMemBlock(); 00050 00051 /** Resize the shared memory block. */ 00052 void resize(size_t mem_block_size ); 00053 00054 template <class T> T getAs() 00055 { 00056 if (!stlplus::smart_ptr< vector_byte >::present()) 00057 THROW_EXCEPTION("Trying to access to an uninitialized memory block"); 00058 00059 if( stlplus::smart_ptr< vector_byte >::operator ->()->empty() ) 00060 THROW_EXCEPTION("Trying to access to a memory block of size 0"); 00061 00062 return reinterpret_cast<T>( & stlplus::smart_ptr< vector_byte >::operator ->()->operator [](0) ); 00063 } 00064 00065 template <class T> T getAs() const 00066 { 00067 if (!stlplus::smart_ptr< vector_byte >::present()) 00068 THROW_EXCEPTION("Trying to access to an uninitialized memory block"); 00069 00070 if( stlplus::smart_ptr< vector_byte >::operator ->()->empty() ) 00071 THROW_EXCEPTION("Trying to access to a memory block of size 0"); 00072 00073 return reinterpret_cast<const T>( & stlplus::smart_ptr< vector_byte >::operator ->()->operator [](0) ); 00074 } 00075 00076 }; // End of class 00077 00078 } // End of namespace 00079 } // End of namespace 00080 00081 #endif
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