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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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LEARN ABOUT DEBIAN

runlim

RUNLIM(1)						      General Commands Manual							 RUNLIM(1)

NAME

       runlim - a program to run benchmarks

SYNOPSIS

       runlim [ options  ...]  command	[ arguments  ...]

DESCRIPTION

       run  is	a  tool  that  can be used to run and control benchmarks.  It executes a given command with (optional) arguments, samples resource
       usage during the run, and kills the process (and its child processes) if a certain time and/or space limit is exhausted.

       Every 100 milliseconds, runlim takes a sample of the program's resource utilization, and logs status information to  stderr  every  second.
       Optionally, the status can be logged to a file.

       Multi-threaded programs can be limited by setting a wall clock timeout.	runlim follows the time accumulation scheme of GNU time for multi-
       threaded programs and programs that spawn multiple child-processes: time spent in each thread/child is  summed  up,  unless  you  are  only
       interested in walk clock time.

OPTIONS

       runlim accepts the following options:

       -h, --help
	      Show summary of options.

       --version
	      Show version of program.

       -o FILE, --output-file=FILE
	      Overwrite or create FILE for output logging.

       -s NUM, --space-limit=NUM
	      Set space limit to NUM megabytes.

       -t NUM, --time-limit=NUM
	      Set time limit to NUM seconds.

       -r NUM, --real-time-limit=NUM
	      Set real time limit to NUM seconds.

       -k, --kill
	      Propagate signals.

SEE ALSO

       time(1), timelimit(1), timeout(1), time(7).

AUTHOR

       runlim was written by Armin Biere and Toni Jussila.

       This manual page was written by Thomas Krennwallner <tkren@kr.tuwien.ac.at>, for the Debian project (and may be used by others).

								 February 11, 2011							 RUNLIM(1)
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