FastArray.h
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上传日期:2013-08-04
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- /*
- * Copyright (c) 2001,2002,2003 Mike Matsnev. All Rights Reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice immediately at the beginning of the file, without modification,
- * this list of conditions, and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Absolutely no warranty of function or purpose is made by the author
- * Mike Matsnev.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * $Id: FastArray.h,v 1.4.2.1 2003/04/12 22:52:32 mike Exp $
- *
- */
- #ifndef FASTARRAY_H
- #define FASTARRAY_H
- class FastArrayImp {
- protected:
- HANDLE m_heap;
- unsigned m_item_size;
- char **m_chunks;
- unsigned m_nchunks;
- enum {
- CHUNK_BITS=10, // 1<<10 items per chunk
- CHUNK_ITEMS=1<<CHUNK_BITS,
- CHUNK_MASK=CHUNK_ITEMS-1
- };
- unsigned m_curchunk;
- unsigned m_chunkptr;
- bool m_dofree;
- FastArrayImp(unsigned item_size,HANDLE heap,bool dofree);
- ~FastArrayImp();
- void *Get() {
- if (m_chunkptr<CHUNK_ITEMS)
- return m_chunks[m_curchunk]+m_item_size*m_chunkptr++;
- return SlowGet();
- }
- int Size() { return (m_curchunk<<CHUNK_BITS)+m_chunkptr; }
- void *Item(unsigned ii) {
- return m_chunks[ii>>CHUNK_BITS]+m_item_size*(ii&CHUNK_MASK);
- }
- void *SlowGet();
- void RemoveAll() { m_chunkptr=m_curchunk=0; }
- };
- // WARNING: this is intended for use with structures _without_ constructors and
- // destructors
- template<class T>
- class FastArray: public FastArrayImp {
- public:
- FastArray(HANDLE heap,bool dofree=false) : FastArrayImp(sizeof(T),heap,dofree) { }
- T *Get() { return (T*)FastArrayImp::Get(); }
- T& operator[](int ii) { return *(T*)FastArrayImp::Item(ii); }
- int GetSize() { return Size(); }
- void Add(T& tt) { memcpy(Get(),&tt,sizeof(T)); }
- // does _not_ release memory
- void RemoveAll() { FastArrayImp::RemoveAll(); }
- };
- #endif