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authordan miller2007-10-19 05:20:07 +0000
committerdan miller2007-10-19 05:20:07 +0000
commitfca74b0bf0a0833f5701e9c0de7b3bc15b2233dd (patch)
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1/*************************************************************************
2 * *
3 * Open Dynamics Engine, Copyright (C) 2001,2002 Russell L. Smith. *
4 * All rights reserved. Email: russ@q12.org Web: www.q12.org *
5 * *
6 * This library is free software; you can redistribute it and/or *
7 * modify it under the terms of EITHER: *
8 * (1) The GNU Lesser General Public License as published by the Free *
9 * Software Foundation; either version 2.1 of the License, or (at *
10 * your option) any later version. The text of the GNU Lesser *
11 * General Public License is included with this library in the *
12 * file LICENSE.TXT. *
13 * (2) The BSD-style license that is included with this library in *
14 * the file LICENSE-BSD.TXT. *
15 * *
16 * This library is distributed in the hope that it will be useful, *
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the files *
19 * LICENSE.TXT and LICENSE-BSD.TXT for more details. *
20 * *
21 *************************************************************************/
22
23/* this comes from the `reuse' library. copy any changes back to the source.
24 *
25 * Variable sized array template. The array is always stored in a contiguous
26 * chunk. The array can be resized. A size increase will cause more memory
27 * to be allocated, and may result in relocation of the array memory.
28 * A size decrease has no effect on the memory allocation.
29 *
30 * Array elements with constructors or destructors are not supported!
31 * But if you must have such elements, here's what to know/do:
32 * - Bitwise copy is used when copying whole arrays.
33 * - When copying individual items (via push(), insert() etc) the `='
34 * (equals) operator is used. Thus you should define this operator to do
35 * a bitwise copy. You should probably also define the copy constructor.
36 */
37
38
39#ifndef _ODE_ARRAY_H_
40#define _ODE_ARRAY_H_
41
42#include <ode/config.h>
43
44
45// this base class has no constructors or destructor, for your convenience.
46
47class dArrayBase {
48protected:
49 int _size; // number of elements in `data'
50 int _anum; // allocated number of elements in `data'
51 void *_data; // array data
52
53 void _freeAll (int sizeofT);
54 void _setSize (int newsize, int sizeofT);
55 // set the array size to `newsize', allocating more memory if necessary.
56 // if newsize>_anum and is a power of two then this is guaranteed to
57 // set _size and _anum to newsize.
58
59public:
60 // not: dArrayBase () { _size=0; _anum=0; _data=0; }
61
62 int size() const { return _size; }
63 int allocatedSize() const { return _anum; }
64 void * operator new (size_t size);
65 void operator delete (void *ptr, size_t size);
66
67 void constructor() { _size=0; _anum=0; _data=0; }
68 // if this structure is allocated with malloc() instead of new, you can
69 // call this to set it up.
70
71 void constructLocalArray (int __anum);
72 // this helper function allows non-reallocating arrays to be constructed
73 // on the stack (or in the heap if necessary). this is something of a
74 // kludge and should be used with extreme care. this function acts like
75 // a constructor - it is called on uninitialized memory that will hold the
76 // Array structure and the data. __anum is the number of elements that
77 // are allocated. the memory MUST be allocated with size:
78 // sizeof(ArrayBase) + __anum*sizeof(T)
79 // arrays allocated this way will never try to reallocate or free the
80 // memory - that's your job.
81};
82
83
84template <class T> class dArray : public dArrayBase {
85public:
86 void equals (const dArray<T> &x) {
87 setSize (x.size());
88 memcpy (_data,x._data,x._size * sizeof(T));
89 }
90
91 dArray () { constructor(); }
92 dArray (const dArray<T> &x) { constructor(); equals (x); }
93 ~dArray () { _freeAll(sizeof(T)); }
94 void setSize (int newsize) { _setSize (newsize,sizeof(T)); }
95 T *data() const { return (T*) _data; }
96 T & operator[] (int i) const { return ((T*)_data)[i]; }
97 void operator = (const dArray<T> &x) { equals (x); }
98
99 void push (const T item) {
100 if (_size < _anum) _size++; else _setSize (_size+1,sizeof(T));
101 memcpy (&(((T*)_data)[_size-1]), &item, sizeof(T));
102 }
103
104 void swap (dArray<T> &x) {
105 int tmp1;
106 void *tmp2;
107 tmp1=_size; _size=x._size; x._size=tmp1;
108 tmp1=_anum; _anum=x._anum; x._anum=tmp1;
109 tmp2=_data; _data=x._data; x._data=tmp2;
110 }
111
112 // insert the item at the position `i'. if i<0 then add the item to the
113 // start, if i >= size then add the item to the end of the array.
114 void insert (int i, const T item) {
115 if (_size < _anum) _size++; else _setSize (_size+1,sizeof(T));
116 if (i >= (_size-1)) i = _size-1; // add to end
117 else {
118 if (i < 0) i=0; // add to start
119 int n = _size-1-i;
120 if (n>0) memmove (((T*)_data) + i+1, ((T*)_data) + i, n*sizeof(T));
121 }
122 ((T*)_data)[i] = item;
123 }
124
125 void remove (int i) {
126 if (i >= 0 && i < _size) { // passing this test guarantees size>0
127 int n = _size-1-i;
128 if (n>0) memmove (((T*)_data) + i, ((T*)_data) + i+1, n*sizeof(T));
129 _size--;
130 }
131 }
132};
133
134
135#endif