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/*************************************************************************
* *
* Open Dynamics Engine, Copyright (C) 2001,2002 Russell L. Smith. *
* All rights reserved. Email: russ@q12.org Web: www.q12.org *
* *
* This library is free software; you can redistribute it and/or *
* modify it under the terms of EITHER: *
* (1) The GNU Lesser General Public License as published by the Free *
* Software Foundation; either version 2.1 of the License, or (at *
* your option) any later version. The text of the GNU Lesser *
* General Public License is included with this library in the *
* file LICENSE.TXT. *
* (2) The BSD-style license that is included with this library in *
* the file LICENSE-BSD.TXT. *
* *
* This library is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the files *
* LICENSE.TXT and LICENSE-BSD.TXT for more details. *
* *
*************************************************************************/
/* this comes from the `reuse' library. copy any changes back to the source.
*
* Variable sized array template. The array is always stored in a contiguous
* chunk. The array can be resized. A size increase will cause more memory
* to be allocated, and may result in relocation of the array memory.
* A size decrease has no effect on the memory allocation.
*
* Array elements with constructors or destructors are not supported!
* But if you must have such elements, here's what to know/do:
* - Bitwise copy is used when copying whole arrays.
* - When copying individual items (via push(), insert() etc) the `='
* (equals) operator is used. Thus you should define this operator to do
* a bitwise copy. You should probably also define the copy constructor.
*/
#ifndef _ODE_ARRAY_H_
#define _ODE_ARRAY_H_
#include <ode/config.h>
// this base class has no constructors or destructor, for your convenience.
class dArrayBase {
protected:
int _size; // number of elements in `data'
int _anum; // allocated number of elements in `data'
void *_data; // array data
void _freeAll (int sizeofT);
void _setSize (int newsize, int sizeofT);
// set the array size to `newsize', allocating more memory if necessary.
// if newsize>_anum and is a power of two then this is guaranteed to
// set _size and _anum to newsize.
public:
// not: dArrayBase () { _size=0; _anum=0; _data=0; }
int size() const { return _size; }
int allocatedSize() const { return _anum; }
void * operator new (size_t size);
void operator delete (void *ptr, size_t size);
void constructor() { _size=0; _anum=0; _data=0; }
// if this structure is allocated with malloc() instead of new, you can
// call this to set it up.
void constructLocalArray (int __anum);
// this helper function allows non-reallocating arrays to be constructed
// on the stack (or in the heap if necessary). this is something of a
// kludge and should be used with extreme care. this function acts like
// a constructor - it is called on uninitialized memory that will hold the
// Array structure and the data. __anum is the number of elements that
// are allocated. the memory MUST be allocated with size:
// sizeof(ArrayBase) + __anum*sizeof(T)
// arrays allocated this way will never try to reallocate or free the
// memory - that's your job.
};
template <class T> class dArray : public dArrayBase {
public:
void equals (const dArray<T> &x) {
setSize (x.size());
memcpy (_data,x._data,x._size * sizeof(T));
}
dArray () { constructor(); }
dArray (const dArray<T> &x) { constructor(); equals (x); }
~dArray () { _freeAll(sizeof(T)); }
void setSize (int newsize) { _setSize (newsize,sizeof(T)); }
T *data() const { return (T*) _data; }
T & operator[] (int i) const { return ((T*)_data)[i]; }
void operator = (const dArray<T> &x) { equals (x); }
void push (const T item) {
if (_size < _anum) _size++; else _setSize (_size+1,sizeof(T));
memcpy (&(((T*)_data)[_size-1]), &item, sizeof(T));
}
void swap (dArray<T> &x) {
int tmp1;
void *tmp2;
tmp1=_size; _size=x._size; x._size=tmp1;
tmp1=_anum; _anum=x._anum; x._anum=tmp1;
tmp2=_data; _data=x._data; x._data=tmp2;
}
// insert the item at the position `i'. if i<0 then add the item to the
// start, if i >= size then add the item to the end of the array.
void insert (int i, const T item) {
if (_size < _anum) _size++; else _setSize (_size+1,sizeof(T));
if (i >= (_size-1)) i = _size-1; // add to end
else {
if (i < 0) i=0; // add to start
int n = _size-1-i;
if (n>0) memmove (((T*)_data) + i+1, ((T*)_data) + i, n*sizeof(T));
}
((T*)_data)[i] = item;
}
void remove (int i) {
if (i >= 0 && i < _size) { // passing this test guarantees size>0
int n = _size-1-i;
if (n>0) memmove (((T*)_data) + i, ((T*)_data) + i+1, n*sizeof(T));
_size--;
}
}
};
#endif
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