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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> |
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20 | #include <gp_Pnt.hxx> |
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21 | |
22 | /** |
23 | * General purpose buffer that is allocated on the stack with a |
24 | * constant size MeshVS_BufSize, or is allocated dynamically if the requested |
25 | * size exceeds the standard one. |
26 | * It is useful when an allocation of an array of unknown size is needed, |
27 | * and most often the array is small enough to allocate as automatic C array. |
28 | */ |
29 | |
30 | //! define the constant to the size of 10 points |
31 | #define MeshVS_BufSize 10*3*sizeof(double) |
32 | |
33 | class MeshVS_Buffer |
34 | { |
35 | public: |
36 | //! Constructor of the buffer of the requested size |
37 | MeshVS_Buffer (const Standard_Size theSize) |
38 | : myDynData (0) |
39 | { |
40 | if (theSize > MeshVS_BufSize) |
41 | myDynData = Standard::Allocate (theSize); |
42 | } |
43 | |
44 | //! Destructor |
45 | ~MeshVS_Buffer() |
46 | { |
47 | if (myDynData) |
48 | { |
49 | Standard::Free (myDynData); |
50 | myDynData = 0; |
51 | } |
52 | } |
53 | |
54 | //! Cast the buffer to the void pointer |
55 | operator void* () |
56 | { |
57 | return myDynData ? myDynData : (void*) myAutoData; |
58 | } |
59 | |
60 | //! Interpret the buffer as a reference to double |
61 | operator Standard_Real& () |
62 | { |
63 | return * (myDynData ? (Standard_Real*) myDynData : (Standard_Real*) myAutoData); |
64 | } |
65 | |
66 | //! Interpret the buffer as a reference to int |
67 | operator Standard_Integer& () |
68 | { |
69 | return * (myDynData ? (Standard_Integer*) myDynData : (Standard_Integer*) myAutoData); |
70 | } |
71 | |
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72 | //! Interpret the buffer as a reference to gp_Pnt |
73 | operator gp_Pnt& () |
74 | { |
75 | return * (myDynData ? (gp_Pnt*) myDynData : (gp_Pnt*) myAutoData); |
76 | } |
77 | |
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78 | private: |
79 | //! Deprecate copy constructor |
80 | MeshVS_Buffer(const MeshVS_Buffer&) {} |
81 | |
82 | //! Deprecate copy operation |
83 | MeshVS_Buffer& operator=(const MeshVS_Buffer&) {return *this;} |
84 | |
85 | char myAutoData[ MeshVS_BufSize ]; |
86 | void* myDynData; |
87 | }; |
88 | |
89 | #endif |