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76 lines
2.4 KiB
76 lines
2.4 KiB
/*****************************************************************/
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/** Microsoft Windows for Workgroups **/
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/** Copyright (C) Microsoft Corp., 1991-1992 **/
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/*****************************************************************/
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/*
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base.h
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Universal base class for error cascading and debugging information
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FILE HISTORY
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beng 09-Jul-1990 created
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beng 17-Jul-1990 added standard comment header to BASE
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beng 31-Jul-1991 added FORWARDING_BASE
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rustanl 11-Sep-1991 Added DECLARE_OUTLINE_NEWBASE,
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DECLARE_MI_NEWBASE, DEFINE_MI2_NEWBASE,
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DEFINE_MI3_NEWBASE, and DEFINE_MI4_NEWBASE
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gregj 22-Mar-1993 Ported to Chicago environment
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*/
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#ifndef _BASE_HXX_
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#define _BASE_HXX_
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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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NOTES: A class which inherits BASE through a private class should
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use the NEWBASE macro (q.v.) in its definition; otherwise
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its clients will lose the use of ! and QueryError.
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HISTORY:
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rustanl 07-Jun-1990 Created as part of LMOD
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beng 09-Jul-1990 Gutted, removing LMOD methods
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beng 17-Jul-1990 Added USHORT error methods
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beng 19-Oct-1990 Finally, removed BOOL error methods
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johnl 14-Nov-1990 Changed QueryError to be a const method
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beng 25-Jan-1991 Added the ! Boolean operator and NEWBASE
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beng 31-Jul-1991 Made FORWARDING_BASE a friend
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gregj 22-Mar-1993 Ported to Chicago (removed excess baggage)
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*************************************************************************/
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class BASE
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{
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private:
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UINT _err;
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protected:
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BASE() { _err = 0; }
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VOID ReportError( WORD err ) { _err = err; }
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public:
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UINT QueryError() const { return _err; }
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BOOL operator!() const { return (_err != 0); }
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};
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#endif // _BASE_HXX_
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