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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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GRUB-FSTEST(3)						     Library Functions Manual						    GRUB-FSTEST(3)

NAME
grub-fstest -- Debug tool for GRUB's filesystem driver. SYNOPSIS
grub-fstest [-c | --diskcount=NUM] [-C | --crypto] [-d | --debug=STRING] [-K | --zfs-key=FILE|prompt] [-n | --length=NUM] [-r | --root=DEVICE_NAME] [-s | --skip=NUM] [-u | --uncompress] [-v | --verbose] IMAGE_PATH <blocklist FILE | cat FILE | cmp FILE LOCAL | cp FILE LOCAL | crc FILE | hex FILE | ls PATH | xnu_uuid DEVICE> DESCRIPTION
grub-fstest is a tool for testing GRUB's filesystem drivers. You should not normally need to run this program. OPTIONS
--diskcount=NUM Specify the number of input files. --crypto Mount cryptographic devices. --debug=STRING Set debug environment variable. --zfs-key=FILE|prompt Load ZFS cryptographic key. --length=NUM Handle NUM bytes in output file. --root=DEVICE_NAME Set root device. --skip=NUM Skip NUM bytes from output file. --uncompress Uncompress data. --verbose Print verbose messages. COMMANDS
blocklist FILE Display block list of FILE. cat FILE Display FILE on standard output. cmp FILE LOCAL Compare FILE with local file LOCAL. cp FILE LOCAL Copy FILE to local file LOCAL. crc FILE Display the CRC-32 checksum of FILE. hex FILE Display contents of FILE in hexidecimal. ls PATH List files at PATH. xnu_uuid DEVICE Display the XNU UUID of DEVICE. SEE ALSO
info grub Wed Feb 26 2014 GRUB-FSTEST(3)
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