131 lines
2.4 KiB
C++
131 lines
2.4 KiB
C++
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//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1992 - 1993.
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//
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// File: ptrcache.hxx
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//
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// Contents: CPtrCache header
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//
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// Classes: CPtrCache
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//
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// History: 26-Jul-93 DrewB Created
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//
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//----------------------------------------------------------------------------
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#ifndef __PTRCACHE_HXX__
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#define __PTRCACHE_HXX__
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#include <debnot.h>
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#include <dfmem.hxx>
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//+---------------------------------------------------------------------------
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//
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// Class: CPtrBlock (pb)
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//
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// Purpose: Holds an array of pointers
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//
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// Interface: See below
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//
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// History: 26-Jul-93 DrewB Created
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//
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//----------------------------------------------------------------------------
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#define CBLOCKPTRS 50
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class CPtrBlock
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{
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public:
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inline CPtrBlock(CPtrBlock *pbNext);
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inline void Add(void *pv);
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inline BOOL Full(void);
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inline int Count(void);
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inline void *Nth(int n);
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inline CPtrBlock *Next(void);
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private:
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int _cPtrs;
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CPtrBlock *_pbNext;
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void *_apv[CBLOCKPTRS];
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};
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inline CPtrBlock::CPtrBlock(CPtrBlock *pbNext)
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{
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_cPtrs = 0;
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_pbNext = pbNext;
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}
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inline void CPtrBlock::Add(void *pv)
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{
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Win4Assert(_cPtrs < CBLOCKPTRS);
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_apv[_cPtrs++] = pv;
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}
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inline BOOL CPtrBlock::Full(void)
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{
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return _cPtrs == CBLOCKPTRS;
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}
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inline int CPtrBlock::Count(void)
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{
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return _cPtrs;
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}
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inline void *CPtrBlock::Nth(int n)
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{
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Win4Assert(n >= 0 && n < _cPtrs);
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return _apv[n];
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}
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inline CPtrBlock *CPtrBlock::Next(void)
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{
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return _pbNext;
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}
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//+---------------------------------------------------------------------------
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//
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// Class: CPtrCache (pc)
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//
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// Purpose: Holds an arbitrary number of pointers using an efficient
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// block allocation scheme
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//
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// Interface: See below
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//
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// History: 26-Jul-93 DrewB Created
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//
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//----------------------------------------------------------------------------
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class CPtrCache : public CLocalAlloc
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{
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public:
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inline CPtrCache(void);
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~CPtrCache(void);
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SCODE Add(void *pv);
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inline void StartEnum(void);
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BOOL Next(void **ppv);
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private:
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CPtrBlock _pbFirst;
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CPtrBlock *_pbHead;
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CPtrBlock *_pbEnum;
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int _iEnum;
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};
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inline CPtrCache::CPtrCache(void)
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: _pbFirst(NULL)
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{
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_pbHead = &_pbFirst;
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StartEnum();
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}
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inline void CPtrCache::StartEnum(void)
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{
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_pbEnum = _pbHead;
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_iEnum = 0;
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}
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#endif // #ifndef __PTRCACHE_HXX__
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