You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
160 lines
3.9 KiB
160 lines
3.9 KiB
//____________________________________________________________________________
|
|
//
|
|
// Microsoft Windows
|
|
// Copyright (C) Microsoft Corporation, 1995 - 1996.
|
|
//
|
|
// File: SafeTemp.h
|
|
//
|
|
// Contents: A template for safe pointers.
|
|
//
|
|
// Classes: XSafeInterfacePtr<ISome>
|
|
//
|
|
// History: 6/3/1996 RaviR Created
|
|
//____________________________________________________________________________
|
|
//
|
|
|
|
|
|
//____________________________________________________________________________
|
|
//
|
|
// Template: XSafeInterfacePtr
|
|
//
|
|
// Purpose: Safe pointer to any interface that supports AddRef/Release
|
|
//
|
|
// Notes: This works for classes that define AddRef/Release, or for
|
|
// OLE interfaces. It is not necessary that the class
|
|
// be a derivative of IUnknown, so long as it supports
|
|
// AddRef and Release methods which have the same semantics as
|
|
// those in IUnknown.
|
|
//
|
|
// The constructor takes a parameter which specifies whether
|
|
// the captured pointer should be AddRef'd, defaulting to TRUE.
|
|
//
|
|
// The Copy function creates a valid additional copy of
|
|
// the captured pointer (following the AddRef/Release protocol)
|
|
// so can be used to hand out copies from a safe pointer declared
|
|
// as a member of some other class.
|
|
//
|
|
// The 'Transfer' function transfers the interface pointer, and
|
|
// invalidates its member value (by setting it to NULL).
|
|
//
|
|
// To release the existing interface ptr and set it to a new
|
|
// instance use the 'Set' member fuction. This method takes a
|
|
// parameter which specifies whether the new pointer should be
|
|
// AddRef'd, defaulting to TRUE.
|
|
//
|
|
// The following methods manipulate the interface pointer with
|
|
// out following the AddRef/Release protocol: Transfer, Attach
|
|
// and Detach.
|
|
//
|
|
// History: 6/3/1996 RaviR Created
|
|
//____________________________________________________________________________
|
|
//
|
|
|
|
|
|
template<class ISome>
|
|
class XSafeInterfacePtr
|
|
{
|
|
public:
|
|
|
|
inline XSafeInterfacePtr(ISome * pinter=NULL, BOOL fInc=TRUE)
|
|
: _p ( pinter )
|
|
{
|
|
if (fInc && (_p != NULL))
|
|
{
|
|
_p->AddRef();
|
|
}
|
|
}
|
|
|
|
inline ~XSafeInterfacePtr()
|
|
{
|
|
if (_p != NULL)
|
|
{
|
|
_p->Release();
|
|
_p = NULL;
|
|
}
|
|
}
|
|
|
|
inline BOOL IsNull(void)
|
|
{
|
|
return (_p == NULL);
|
|
}
|
|
|
|
inline void Copy(ISome **pxtmp)
|
|
{
|
|
*pxtmp = _p;
|
|
if (_p != NULL)
|
|
_p->AddRef();
|
|
}
|
|
|
|
inline void Transfer(ISome **pxtmp)
|
|
{
|
|
*pxtmp = _p;
|
|
_p = NULL;
|
|
}
|
|
|
|
inline void Set(ISome* p, BOOL fInc = TRUE)
|
|
{
|
|
if (_p)
|
|
{
|
|
_p->Release();
|
|
}
|
|
_p = p;
|
|
if (fInc && _p)
|
|
{
|
|
_p->AddRef();
|
|
}
|
|
}
|
|
|
|
inline void SafeRelease(void)
|
|
{
|
|
if (_p)
|
|
{
|
|
_p->Release();
|
|
_p = NULL;
|
|
}
|
|
}
|
|
|
|
inline void SimpleRelease(void)
|
|
{
|
|
ASSERT(_p != NULL);
|
|
_p->Release();
|
|
_p = NULL;
|
|
}
|
|
|
|
inline void Attach(ISome* p)
|
|
{
|
|
ASSERT(_p == NULL);
|
|
_p = p;
|
|
}
|
|
|
|
inline void Detach(void)
|
|
{
|
|
_p = NULL;
|
|
}
|
|
|
|
inline ISome * operator-> () { return _p; }
|
|
|
|
inline ISome& operator * () { return *_p; }
|
|
|
|
inline operator ISome *() { return _p; }
|
|
|
|
inline ISome ** operator &()
|
|
{
|
|
ASSERT( _p == NULL );
|
|
return &_p;
|
|
}
|
|
|
|
inline ISome *Self(void) { return _p; }
|
|
|
|
private:
|
|
|
|
ISome * _p;
|
|
|
|
inline void operator= (const XSafeInterfacePtr &) {;}
|
|
|
|
inline XSafeInterfacePtr(const XSafeInterfacePtr &){;}
|
|
|
|
};
|
|
|
|
|
|
|