76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
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/*++
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Copyright (c) 1997 Microsoft Corporation
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Module Name:
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base.h
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Abstract:
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Universal base class for error cascading and debugging information
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Author:
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Vlad Sadovsky (vlads) 26-Jan-1997
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Revision History:
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26-Jan-1997 VladS created
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--*/
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#ifndef _BASE_H_
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#define _BASE_H_
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/*************************************************************************
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NAME: BASE (base)
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SYNOPSIS: Universal base object, root of every class.
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It contains universal error status and debugging
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support.
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INTERFACE: ReportError() - report an error on the object from
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within the object.
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QueryError() - return the current error state,
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or 0 if no error outstanding.
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operator!() - return TRUE if an error is outstanding.
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Typically means that construction failed.
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CAVEATS: This sort of error reporting is safe enough in a single-
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threaded system, but loses robustness when multiple threads
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access shared objects. Use it for constructor-time error
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handling primarily.
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*************************************************************************/
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class BASE : public IUnknown
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{
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private:
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UINT m_err;
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protected:
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LONG m_cRef;
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BASE() { m_err = 0; m_cRef = 1;}
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VOID ReportError( UINT err ) { m_err = err; }
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public:
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// *** IUnknown methods ***
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STDMETHOD(QueryInterface)( THIS_ REFIID riid, LPVOID * ppvObj) PURE;
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STDMETHOD_(ULONG,AddRef)(THIS) PURE;
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STDMETHOD_(ULONG,Release)( THIS) PURE;
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// *** BASE Methods
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UINT QueryError() const { return m_err; }
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LONG QueryRefCount() { return m_cRef;}
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BOOL operator!() const { return (m_err != 0); }
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};
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#endif // _BASE_H_
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