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common.ch
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1999-09-15
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/*
* $Id: common.ch,v 1.2 1999/09/15 14:03:36 vszel Exp $
*/
/*
* Harbour Project source code:
* Header file for common macros
*
* Copyright 1999 {list of individual authors and e-mail addresses}
* www - http://www.harbour-project.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version, with one exception:
*
* The exception is that if you link the Harbour Runtime Library (HRL)
* and/or the Harbour Virtual Machine (HVM) with other files to produce
* an executable, this does not by itself cause the resulting executable
* to be covered by the GNU General Public License. Your use of that
* executable is in no way restricted on account of linking the HRL
* and/or HVM code into it.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA (or visit
* their web site at http://www.gnu.org/).
*
*/
#ifndef _COMMON_CH
#define _COMMON_CH
/* Friendly logical aliases */
#define TRUE .T.
#define FALSE .F.
#define YES .T.
#define NO .F.
/* Type checking macros */
#translate ISNIL( <xValue> ) => ( <xValue> == NIL )
#translate ISARRAY( <xValue> ) => ( ValType( <xValue> ) == "A" )
#translate ISBLOCK( <xValue> ) => ( ValType( <xValue> ) == "B" )
#translate ISCHAR( <xValue> ) => ( ValType( <xValue> ) == "C" )
#translate ISDATE( <xValue> ) => ( ValType( <xValue> ) == "D" )
#translate ISLOG( <xValue> ) => ( ValType( <xValue> ) == "L" )
#translate ISMEMO( <xValue> ) => ( ValType( <xValue> ) == "M" )
#translate ISNUM( <xValue> ) => ( ValType( <xValue> ) == "N" )
#translate ISOBJECT( <xValue> ) => ( ValType( <xValue> ) == "O" )
/* DEFAULT and UPDATE commands */
#xcommand DEFAULT <v1> TO <x1> [, <vn> TO <xn> ] => ;
IF <v1> == NIL ; <v1> := <x1> ; END ;
[; IF <vn> == NIL ; <vn> := <xn> ; END ]
#command UPDATE <v1> IF <exp> TO <v2> => ;
IF <exp> ; <v1> := <v2> ; END
#endif /* _COMMON_CH */