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1 | // Created on: 1992-10-13 |
| 2 | // Created by: Ramin BARRETO, CLE (1994 Standard Light) |
| 3 | // Copyright (c) 1992-1999 Matra Datavision |
| 4 | // Copyright (c) 1999-2014 OPEN CASCADE SAS |
| 5 | // |
| 6 | // This file is part of Open CASCADE Technology software library. |
| 7 | // |
| 8 | // This library is free software; you can redistribute it and/or modify it under |
| 9 | // the terms of the GNU Lesser General Public License version 2.1 as published |
| 10 | // by the Free Software Foundation, with special exception defined in the file |
| 11 | // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT |
| 12 | // distribution for complete text of the license and disclaimer of any warranty. |
| 13 | // |
| 14 | // Alternatively, this file may be used under the terms of Open CASCADE |
| 15 | // commercial license or contractual agreement. |
| 16 | |
| 17 | #ifndef _MMgt_TShared_HeaderFile |
| 18 | #define _MMgt_TShared_HeaderFile |
| 19 | |
| 20 | #include <Standard.hxx> |
| 21 | #include <Standard_Type.hxx> |
| 22 | |
| 23 | #include <Standard_Transient.hxx> |
| 24 | class Standard_OutOfMemory; |
| 25 | |
| 26 | |
| 27 | class MMgt_TShared; |
| 28 | DEFINE_STANDARD_HANDLE(MMgt_TShared, Standard_Transient) |
| 29 | |
| 30 | |
| 31 | //! Intermediate class between Standard_Transient |
| 32 | //! and descendants. |
| 33 | //! The abstract class TShared is the root class of |
| 34 | //! managed objects. TShared objects are managed |
| 35 | //! by a memory manager based on reference |
| 36 | //! counting. They have handle semantics. In other |
| 37 | //! words, the reference counter is transparently |
| 38 | //! incremented and decremented according to the |
| 39 | //! scope of handles. When all handles, which |
| 40 | //! reference a single object are out of scope, the |
| 41 | //! reference counter becomes null and the object is |
| 42 | //! automatically deleted. The deallocated memory is |
| 43 | //! not given back to the system though. It is |
| 44 | //! reclaimed for new objects of the same size. |
| 45 | //! Warning |
| 46 | //! This memory management scheme does not |
| 47 | //! work for cyclic data structures. In such cases |
| 48 | //! (with back pointers for example), you should |
| 49 | //! interrupt the cycle in a class by using a full C++ |
| 50 | //! pointer instead of a handle. |
| 51 | class MMgt_TShared : public Standard_Transient |
| 52 | { |
| 53 | |
| 54 | public: |
| 55 | |
| 56 | |
| 57 | Standard_EXPORT virtual void Delete() const Standard_OVERRIDE; |
| 58 | |
| 59 | |
| 60 | |
| 61 | |
| 62 | DEFINE_STANDARD_RTTI(MMgt_TShared,Standard_Transient) |
| 63 | |
| 64 | protected: |
| 65 | |
| 66 | |
| 67 | |
| 68 | |
| 69 | private: |
| 70 | |
| 71 | |
| 72 | |
| 73 | |
| 74 | }; |
| 75 | |
| 76 | |
| 77 | |
| 78 | |
| 79 | |
| 80 | |
| 81 | |
| 82 | #endif // _MMgt_TShared_HeaderFile |
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