Is there a way to define a compile time constant/enum with dmd?  For example, inserting the svn revision number into my code?  In C...

#include <stdio.h>
#ifndef SOMETHING
#define SOMETHING "bar"
#endif
int main() {
	printf("hello world: " SOMETHING " \n");
	return 0;
}


> gcc main.c && ./a.out
hello world: bar
> gcc -DSOMETHING=\"foo\" main.c && ./a.out
hello world: foo


How would you recommend I do something like this with D?

Brenton:

> How would you recommend I do something like this with D?

In D compile-time constants are introduced using the "enum" keyword.

You can also use the "-version=..." compiler switch to compile your D code according to some version, that can be a number or identifier.

In D there isn't the "-D" switch of gcc, so you can do something similar putting your string into a little textual file, and importing it inside the module using mixin(import("myfilename.txt")) statement plus the -Imypathname compiler switch.

Bye,
bearophile

On Saturday, 5 July 2014 at 22:08:52 UTC, bearophile wrote:
> Brenton:
>
>> How would you recommend I do something like this with D?
>
> In D compile-time constants are introduced using the "enum" keyword.
>
> You can also use the "-version=..." compiler switch to compile your D code according to some version, that can be a number or identifier.
>
> In D there isn't the "-D" switch of gcc, so you can do something similar putting your string into a little textual file, and importing it inside the module using mixin(import("myfilename.txt")) statement plus the -Imypathname compiler switch.
>
> Bye,
> bearophile

Thanks bearophile, using mixin(import("myfilename.txt")) works great.