Jean-François Mertens wrote:
>
> On 02 Jun 2009, at 03:03, Martin Costabel wrote:
>
>> ...
>> The idea is clear, but preprocessor macros don't work like that.
>
> Really thanks for making so clear msgs !
> FInally I understand for sure that cpp works
> like tex's \def rather than \edef _ and I'll
> feel much more comfortable using it knowing
> for sure the right interpretation !
> (and I guess there are no analogues of \edef or \let ?)
The most difficult thing was to find out how to print the value of a
macro at a given moment. From a diving expedition into the depths of the
docs, I brought home some macros that give the following small example
program in C:
#include <stdio.h>
// stringify the value of a macro for printing
#define str(x) #x
#define xstr(x) str(x)
// play with replacing macros
#define OLD_DEBUG 1
#define DEBUG OLD_DEBUG
int main(){
printf("Before: %s\n", xstr(DEBUG));
#undef OLD_DEBUG
printf("After : %s\n", xstr(DEBUG));
return(0);
}
If you compile and run this, it prints
costabel% ./a.out
Before: 1
After : OLD_DEBUG
I don't know enough to say that there are no analogues of \edef or \let,
but I haven't come across them yet.
--
Martin
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