Preprocessor thingy
Hi, I don't know if boost has a solution for my problem, or there is just something simple I miss... I've been struggling with some preprocessor things. I'm trying to use it for versioning. Here is the problem: I've got these defines: #define VERSION_MAJOR 5 #define VERSION_MINOR 4 #define VERSION_BUILD 3 #define VERSION_SUBBUILD 2 Sometimes I just need a string like: "5.4.3.2". I do it like this: #define STRINGER_(s) #s #define STRINGER(s) STRINGER_(s) #define VERSION_STRING_1 \ STRINGER(VERSION_MAJOR) "." \ STRINGER(VERSION_MINOR) "." \ STRINGER(VERSION_BUILD) "." \ STRINGER(VERSION_SUBBUILD) So VERSION_STRING_1 is "5.4.3.2" Now I need a string like: "5.4.3b". (Note the 'b'. When VERSION_SUBBUILD == 3, I want it to be a 'c' etc) How do I do this in a preprocessor command???? The char is simple, its (VERSION_SUBBUILD+'a'-1). How do I add that to a string?? It just looks so simple, I can't stand I'm not finding a solution! I'm hoping someone could help me! Regards Johan
Johan 't Hart wrote:
Hi,
I don't know if boost has a solution for my problem, or there is just something simple I miss... I've been struggling with some preprocessor things. I'm trying to use it for versioning. Here is the problem:
I've got these defines:
#define VERSION_MAJOR 5 #define VERSION_MINOR 4 #define VERSION_BUILD 3 #define VERSION_SUBBUILD 2
Sometimes I just need a string like: "5.4.3.2". I do it like this:
#define STRINGER_(s) #s #define STRINGER(s) STRINGER_(s) #define VERSION_STRING_1 \ STRINGER(VERSION_MAJOR) "." \ STRINGER(VERSION_MINOR) "." \ STRINGER(VERSION_BUILD) "." \ STRINGER(VERSION_SUBBUILD)
So VERSION_STRING_1 is "5.4.3.2" Now I need a string like: "5.4.3b". (Note the 'b'. When VERSION_SUBBUILD == 3, I want it to be a 'c' etc) How do I do this in a preprocessor command???? The char is simple, its (VERSION_SUBBUILD+'a'-1).
You need a lookup table to do it all in the preprocessor, AFAIK:
#include
Thanks alot! This is very useful!
Johan
"Tobias Schwinger"
Johan 't Hart wrote:
Hi,
I don't know if boost has a solution for my problem, or there is just something simple I miss... I've been struggling with some preprocessor things. I'm trying to use it for versioning. Here is the problem:
I've got these defines:
#define VERSION_MAJOR 5 #define VERSION_MINOR 4 #define VERSION_BUILD 3 #define VERSION_SUBBUILD 2
Sometimes I just need a string like: "5.4.3.2". I do it like this:
#define STRINGER_(s) #s #define STRINGER(s) STRINGER_(s) #define VERSION_STRING_1 \ STRINGER(VERSION_MAJOR) "." \ STRINGER(VERSION_MINOR) "." \ STRINGER(VERSION_BUILD) "." \ STRINGER(VERSION_SUBBUILD)
So VERSION_STRING_1 is "5.4.3.2" Now I need a string like: "5.4.3b". (Note the 'b'. When VERSION_SUBBUILD == 3, I want it to be a 'c' etc) How do I do this in a preprocessor command???? The char is simple, its (VERSION_SUBBUILD+'a'-1).
You need a lookup table to do it all in the preprocessor, AFAIK:
#include
#include #define VERSION_ID(major,minor,build,sub_build) \ BOOST_PP_STRINGIZE( \ major.minor.build.BOOST_PP_CAT(N2LCC_,sub_build) )
#define N2LCC_1 a #define N2LCC_2 b #define N2LCC_3 c #define N2LCC_4 d #define N2LCC_5 e #define N2LCC_6 f #define N2LCC_7 g #define N2LCC_8 h #define N2LCC_9 i #define N2LCC_10 j #define N2LCC_11 k #define N2LCC_12 l #define N2LCC_13 m #define N2LCC_14 n #define N2LCC_15 o #define N2LCC_16 p #define N2LCC_17 q #define N2LCC_18 r #define N2LCC_19 s #define N2LCC_20 t #define N2LCC_21 u #define N2LCC_22 v #define N2LCC_23 w #define N2LCC_24 x #define N2LCC_25 y #define N2LCC_26 z
VERSION_ID(2,1,3,1)
Regards, Tobias
participants (2)
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Johan 't Hart -
Tobias Schwinger