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