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automatically initialize m_cRef to 0 (patch 575011 + more)

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@16115 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin
2002-07-09 11:52:11 +00:00
parent 264a108642
commit 82df67d960
4 changed files with 23 additions and 9 deletions
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28
include/wx/msw/ole/oleutils.h
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@@ -17,9 +17,11 @@
#endif
#include "wx/defs.h"
#if wxUSE_NORLANDER_HEADERS
#include <ole2.h>
#include <ole2.h>
#endif
// ============================================================================
// General purpose functions and macros
// ============================================================================
@@ -39,7 +41,7 @@ inline void ReleaseInterface(IUnknown *pIUnk)
#define RELEASE_AND_NULL(p) if ( (p) != NULL ) { p->Release(); p = NULL; };
// return TRUE if the iid is in the array
bool IsIidFromList(REFIID riid, const IID *aIids[], size_t nCount);
extern bool IsIidFromList(REFIID riid, const IID *aIids[], size_t nCount);
// ============================================================================
// IUnknown implementation helpers
@@ -51,20 +53,36 @@ bool IsIidFromList(REFIID riid, const IID *aIids[], size_t nCount);
implementation is quite enough.
Usage is trivial: here is all you should have
1) DECLARE_IUNKNOWN_METHOS in your (IUnknown derived!) class declaration
1) DECLARE_IUNKNOWN_METHODS in your (IUnknown derived!) class declaration
2) BEGIN/END_IID_TABLE with ADD_IID in between for all interfaces you
support (at least all for which you intent to return 'this' from QI,
i.e. you should derive from IFoo if you have ADD_IID(Foo)) somewhere else
3) IMPLEMENT_IUNKNOWN_METHOS somewhere also
3) IMPLEMENT_IUNKNOWN_METHODS somewhere also
These macros are quite simple: AddRef and Release are trivial and QI does
lookup in a static member array of IIDs and returns 'this' if it founds
the requested interface in it or E_NOINTERFACE if not.
*/
/*
wxAutoULong: this class is used for automatically initalising m_cRef to 0
*/
class wxAutoULong
{
public:
wxAutoULong(ULONG value = 0) : m_Value(value) { }
operator ULONG&() { return m_Value; }
ULONG& operator=(ULONG value) { return m_Value = value; }
private:
ULONG m_Value;
};
// declare the methods and the member variable containing reference count
// you must also define the ms_aIids array somewhere with BEGIN_IID_TABLE
// and friends (see below)
#define DECLARE_IUNKNOWN_METHODS \
public: \
STDMETHODIMP QueryInterface(REFIID, void **); \
@@ -72,7 +90,7 @@ bool IsIidFromList(REFIID riid, const IID *aIids[], size_t nCount);
STDMETHODIMP_(ULONG) Release(); \
private: \
static const IID *ms_aIids[]; \
ULONG m_cRef
wxAutoULong m_cRef
// macros for declaring supported interfaces
// NB: you should write ADD_INTERFACE(Foo) and not ADD_INTERFACE(IID_IFoo)!