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Full Discussion: enum and C preprocessor
Top Forums Programming enum and C preprocessor Post 302556287 by Corona688 on Saturday 17th of September 2011 04:58:59 PM
Old 09-17-2011
enum and C preprocessor
Say I have a list of enumerations I wish to use to select a variable at compile-time:

Code:
enum pins
{
        PIN_A=1,
        PIN_B=7,
        PIN_C=6,
}

int VAR1, VAR2, VAR3, VAR4, VAR5, VAR6, VAR7;

#define PIN_TO_VAR(NUM) VAR ## NUM

int main(void)
{
        PIN_TO_VAR(PIN_A)=32;
}

But this doesn't work, because the macro combines VAR ## NUM into VARPIN_A instead of what I wanted -- value of PIN_A, aka 1, to get VAR1.

The usual trick of #define UNWRAP(X) X doesn't manage to get the value out of the enum, either.

Will I have to just convert all my enums into #define's to get macros to substitute them?
 

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sary

SARY(1) 							       Sary								   SARY(1)

NAME

       sary - manual page for sary 1.0.2

SYNOPSIS

       sary [OPTION]... PATTERN FILE

DESCRIPTION

       -c, --count
	      only print a count of occurrences

       -i, --ignore-case
	      ignore case distinctions

       -l, --lexicographical
	      sort in lexicographical order

       -A, --after-context=NUM
	      print NUM lines of trailing context

       -B, --before-context=NUM
	      print NUM lines of leading context

       -C, --context=[NUM],
	      print NUM (default 2) lines of output context

       -s, --start=TAG,
	      print tagged region. set start tag to TAG

       -e, --end=TAG,
	      print tagged region. set end tag to TAG

       -h, --help
	      display this help and exit

COPYRIGHT

       Copyright (C) 2000 Satoru Takabayashi All rights reserved.
       This  is  free  software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by
       the Free Software Foundation; either version 2.1, or (at your option) any later version.

       This program is distributed in the hope that it will be useful, but WITHOUT ANY	WARRANTY;  without  even  the  implied	warranty  of  MER-
       CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.

sary 1.0.2							   December 2000							   SARY(1)
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