Testing if a function is defined in a module

[Kirk McDonald]

Carlos Smith wrote:
> Hi!
> 
> say i have defined a function (or i dont):
> 
> int YYUSERINIT( )
> {
>    ...
> }
> 
> 
> How can i test (statically), later in the module
> if that function have been defined ?
> 
> if yes, code using the function will
> be compiled.
> 
> Thanks
> 
> 

There are a few ways of phrasing this, but here's one:

static if (is(typeof(&YYUSERINIT))) {
     // Do stuff with the function
}

However, I can't help but wonder what situation you're in where you need 
to check this directly. I'm just guessing, here, but you'd probably be 
better off using a version flag:

version (WithTheFunction) int YYUSERINIT() {}

// Later...
     version (WithTheFunction) {
         // Use the function
     }
// ...

-- 
Kirk McDonald
http://kirkmcdonald.blogspot.com
Pyd: Connecting D and Python
http://pyd.dsource.org