• Brenton (14/16) Jul 05 2014 Is there a way to define a compile time constant/enum with dmd?
• bearophile (13/14) Jul 05 2014 In D compile-time constants are introduced using the "enum"
• Brenton (3/17) Jul 05 2014 Thanks bearophile, using mixin(import("myfilename.txt")) works

"Brenton" <brenton.n.rayner gmail.com> writes:

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?

"bearophile" <bearophileHUGS lycos.com> writes:

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

"Brenton" <brenton.n.rayner gmail.com> writes:

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.