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193 lines
4.8 KiB
193 lines
4.8 KiB
//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1992 - 1992.
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//
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// File: cntxlist.hxx
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//
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// Contents: CContextList header
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//
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// Classes: CContext
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// CContextList
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//
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// History: 26-Oct-92 DrewB Created
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//
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//----------------------------------------------------------------------------
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#ifndef __CNTXLIST_HXX__
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#define __CNTXLIST_HXX__
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#include <ole.hxx>
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#include <cntxtid.hxx>
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//+---------------------------------------------------------------------------
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//
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// Class: CContext (ctx)
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//
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// Purpose: Holds a context's data
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//
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// Interface: See below
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//
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// History: 26-Oct-92 DrewB Created
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// 18-May-93 AlexT Added CMallocBased
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//
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//----------------------------------------------------------------------------
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class CContext; // forward declaration for SAFE macro
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SAFE_DFBASED_PTR(CBasedContextPtr, CContext);
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class CContext : public CMallocBased
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{
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public:
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ContextId ctxid;
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CBasedContextPtr pctxNext;
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};
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//+---------------------------------------------------------------------------
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//
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// Class: CContextList (cl)
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//
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// Purpose: Maintains a list of objects that are context-sensitive
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//
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// Interface: See below
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//
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// History: 26-Oct-92 DrewB Created
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// 18-May-93 AlexT Added CMallocBased
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//
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//----------------------------------------------------------------------------
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class CContextList : public CMallocBased
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{
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protected:
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inline CContextList(void);
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inline ~CContextList(void);
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public:
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inline void AddRef(void);
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inline void Release(void);
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inline CContext *_GetHead(void) const;
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CContext *_Find(ContextId ctxid);
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void Add(CContext *pctx);
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void Remove(CContext *pctx);
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inline ULONG CountContexts(void);
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private:
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CBasedContextPtr _pctxHead;
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LONG _cReferences;
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};
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// Macro to define methods for a derived class
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#define DECLARE_CONTEXT_LIST(type) \
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inline type *Find(ContextId cid) { return (type *)_Find(cid); }\
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inline type *GetHead(void) const { return (type *)_GetHead(); }\
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//+---------------------------------------------------------------------------
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//
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// Member: CContextList::CContextList, public
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//
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// Synopsis: Constructor
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//
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// History: 27-Oct-92 DrewB Created
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//
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//----------------------------------------------------------------------------
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inline CContextList::CContextList(void)
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{
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_pctxHead = NULL;
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_cReferences = 1;
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CContextList::~CContextList, public
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//
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// Synopsis: Destructor
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//
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// History: 27-Oct-92 DrewB Created
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//
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//----------------------------------------------------------------------------
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inline CContextList::~CContextList(void)
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{
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olAssert(_pctxHead == NULL);
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olAssert(_cReferences == 0);
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CContextList::AddRef, public
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//
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// Synopsis: Increments the ref count
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//
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// History: 27-Oct-92 DrewB Created
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//
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//----------------------------------------------------------------------------
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inline void CContextList::AddRef(void)
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{
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AtomicInc(&_cReferences);
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CContextList::Release, public
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//
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// Synopsis: Decrements the ref count
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//
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// History: 27-Oct-92 DrewB Created
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//
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//----------------------------------------------------------------------------
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inline void CContextList::Release(void)
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{
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LONG lRet;
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olAssert(_cReferences > 0);
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lRet = AtomicDec(&_cReferences);
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if (lRet == 0)
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delete this;
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CContextList::_GetHead, public
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//
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// Synopsis: Returns the head of the list
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//
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// History: 26-Oct-92 DrewB Created
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//
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//----------------------------------------------------------------------------
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inline CContext *CContextList::_GetHead(void) const
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{
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return (CContext *)_pctxHead;
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CContextList::Count, public
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//
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// Synopsis: Counts the number of contexts
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//
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// Arguments:
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//
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// Returns: Count of the number of contexts
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//
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// History: 18-Mar-97 BChapman Created
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//
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//----------------------------------------------------------------------------
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inline ULONG CContextList::CountContexts()
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{
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CBasedContextPtr pctx;
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ULONG cnt=0;
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for (pctx = _pctxHead; pctx; pctx = pctx->pctxNext)
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++cnt;
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return cnt;
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}
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#endif // #ifndef __CNTXLIST_HXX__
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