• Bill Baxter (12/12) Apr 27 2007 I was thinking, in my Luigi lib, I was just thinking about adding
• Ameer Armaly (5/17) Apr 27 2007 Probably not quite what you're looking for (and untested), but using a c...
• Gregor Richards (5/21) Apr 28 2007 I actually considered adding something like this as a DSSS feature, but
• Bill Baxter (11/34) Apr 28 2007 All we need is static try catch ;-)

Bill Baxter <dnewsgroup billbaxter.com> writes:

I was thinking, in my Luigi lib, I was just thinking about adding 
support for Schooner's fonts.  But I don't want to require that in order 
to compile. Ok so I could add yet another version flag, but I was 
thinking that it would be nice if support for fonts could just be 
compiled in if found and not otherwise.

So what if there were something like try/catch for imports?

This works in Python, of course it's no problem there because imports 
are done at run time.  But it is a fairly commonly used idiom there, 
which says to me that if it exists it will get used.

Anyway, I seek some better way to control various optional dependencies 
than lots of --version flags.

--bb

"Ameer Armaly" <ameer_armaly hotmail.com> writes:

"Bill Baxter" <dnewsgroup billbaxter.com> wrote in message 
news:f0u9pk$1cgd$1 digitalmars.com...
I was thinking, in my Luigi lib, I was just thinking about adding support 
for Schooner's fonts.  But I don't want to require that in order to 
compile. Ok so I could add yet another version flag, but I was thinking 
that it would be nice if support for fonts could just be compiled in if 
found and not otherwise.

 So what if there were something like try/catch for imports?

 This works in Python, of course it's no problem there because imports are 
 done at run time.  But it is a fairly commonly used idiom there, which 
 says to me that if it exists it will get used.

 Anyway, I seek some better way to control various optional dependencies 
 than lots of --version flags.

Probably not quite what you're looking for (and untested), but using a const 
uint and having each bit represent an option, and use static if? Might even 
work at runtime; I just randomly thought of it right now.
 --bb 

Gregor Richards <Richards codu.org> writes:

Bill Baxter wrote:
 I was thinking, in my Luigi lib, I was just thinking about adding 
 support for Schooner's fonts.  But I don't want to require that in order 
 to compile. Ok so I could add yet another version flag, but I was 
 thinking that it would be nice if support for fonts could just be 
 compiled in if found and not otherwise.
 
 So what if there were something like try/catch for imports?
 
 This works in Python, of course it's no problem there because imports 
 are done at run time.  But it is a fairly commonly used idiom there, 
 which says to me that if it exists it will get used.
 
 Anyway, I seek some better way to control various optional dependencies 
 than lots of --version flags.
 
 --bb

I actually considered adding something like this as a DSSS feature, but 
decided it would be too much of a hack. It would be nifty if this was a 
language feature.

  - Gregor Richards

Bill Baxter <dnewsgroup billbaxter.com> writes:

Gregor Richards wrote:
 Bill Baxter wrote:
 I was thinking, in my Luigi lib, I was just thinking about adding 
 support for Schooner's fonts.  But I don't want to require that in 
 order to compile. Ok so I could add yet another version flag, but I 
 was thinking that it would be nice if support for fonts could just be 
 compiled in if found and not otherwise.

 So what if there were something like try/catch for imports?

 This works in Python, of course it's no problem there because imports 
 are done at run time.  But it is a fairly commonly used idiom there, 
 which says to me that if it exists it will get used.

 Anyway, I seek some better way to control various optional 
 dependencies than lots of --version flags.

 --bb

 
 I actually considered adding something like this as a DSSS feature, but 
 decided it would be too much of a hack. It would be nifty if this was a 
 language feature.
 
  - Gregor Richards

All we need is static try catch ;-)

static try {
    import missing.module;
} catch(CompileTimeImportException e) {
    pragma(msg, "Compiling without support for missing.module")
}
else {
    version = usingMissingModule;
}


Or something like that.