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1 | // Created on: 2007-03-07 |
2 | // Created by: msv@EUCLIDEX |
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3 | // Copyright (c) 2007-2014 OPEN CASCADE SAS |
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4 | // |
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5 | // This file is part of Open CASCADE Technology software library. |
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6 | // |
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7 | // This library is free software; you can redistribute it and/or modify it under |
8 | // the terms of the GNU Lesser General Public License version 2.1 as published |
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9 | // by the Free Software Foundation, with special exception defined in the file |
10 | // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT |
11 | // distribution for complete text of the license and disclaimer of any warranty. |
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12 | // |
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13 | // Alternatively, this file may be used under the terms of Open CASCADE |
14 | // commercial license or contractual agreement. |
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15 | |
16 | #ifndef MeshVS_Buffer_HeaderFile |
17 | #define MeshVS_Buffer_HeaderFile |
18 | |
19 | #include <Standard.hxx> |
20 | |
21 | /** |
22 | * General purpose buffer that is allocated on the stack with a |
23 | * constant size MeshVS_BufSize, or is allocated dynamically if the requested |
24 | * size exceeds the standard one. |
25 | * It is useful when an allocation of an array of unknown size is needed, |
26 | * and most often the array is small enough to allocate as automatic C array. |
27 | */ |
28 | |
29 | //! define the constant to the size of 10 points |
30 | #define MeshVS_BufSize 10*3*sizeof(double) |
31 | |
32 | class MeshVS_Buffer |
33 | { |
34 | public: |
35 | //! Constructor of the buffer of the requested size |
36 | MeshVS_Buffer (const Standard_Size theSize) |
37 | : myDynData (0) |
38 | { |
39 | if (theSize > MeshVS_BufSize) |
40 | myDynData = Standard::Allocate (theSize); |
41 | } |
42 | |
43 | //! Destructor |
44 | ~MeshVS_Buffer() |
45 | { |
46 | if (myDynData) |
47 | { |
48 | Standard::Free (myDynData); |
49 | myDynData = 0; |
50 | } |
51 | } |
52 | |
53 | //! Cast the buffer to the void pointer |
54 | operator void* () |
55 | { |
56 | return myDynData ? myDynData : (void*) myAutoData; |
57 | } |
58 | |
59 | //! Interpret the buffer as a reference to double |
60 | operator Standard_Real& () |
61 | { |
62 | return * (myDynData ? (Standard_Real*) myDynData : (Standard_Real*) myAutoData); |
63 | } |
64 | |
65 | //! Interpret the buffer as a reference to int |
66 | operator Standard_Integer& () |
67 | { |
68 | return * (myDynData ? (Standard_Integer*) myDynData : (Standard_Integer*) myAutoData); |
69 | } |
70 | |
71 | private: |
72 | //! Deprecate copy constructor |
73 | MeshVS_Buffer(const MeshVS_Buffer&) {} |
74 | |
75 | //! Deprecate copy operation |
76 | MeshVS_Buffer& operator=(const MeshVS_Buffer&) {return *this;} |
77 | |
78 | char myAutoData[ MeshVS_BufSize ]; |
79 | void* myDynData; |
80 | }; |
81 | |
82 | #endif |