Is this a bug or illegal code?
Steven Schveighoffer via Digitalmars-d-learn
digitalmars-d-learn at puremagic.com
Thu May 29 08:02:48 PDT 2014
On Thu, 29 May 2014 10:45:28 -0400, safety0ff <safety0ff.dev at gmail.com>
wrote:
> //******* CODE **********
> mixin("version = foo;");
> version(foo)
> {
> void main(){}
> }
> //****** END CODE *******
> If it's illegal in D, what is the reason & where is documented?
>
> The reason I was considering such a construct is the following:
> Some C libraries have an associated "config.h" header that gets
> generated when it is compiled.
> I was thinking it may be possible to parse these config.h files at
> compile time (using text import) and convert some of the #define's into
> "version = foo;"
Even if that is valid code, you are much better off using enums and static
if.
enum includeSomeFeature = ...
static if(includeSomeFeature)
{
...
}
These work much more like #defines, and can be seen outside the module.
-Steve
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