Re: Can I do an or in a version block?

[Ali Çehreli]

On 03/07/2012 10:07 PM, James Miller wrote:
On 8 March 2012 18:38, Tyler Jameson Little<beatgam...@gmail.com>  wrote:
I would like to do something like this:
version (linux || BSD) {
    // do something...
} else {
    version (Windows) {
        // do something else
    } else {
        // do something else
        assert(false, "Unsupported operating system");
    }
}

The only way I've been able to do this, is by splitting up the two versions
and repeat code.

Is there a better way to do this? A static if can do this, so is there a way
that I can use a static if somehow?

I don't think there is an 'elseif' for versions, probably because you
are normally checking mutually exclusive version descriptions.
Otherwise, its probably a good idea to keep the syntax as is, since it
stops people from abusing the mechanic.

--
James Miller

I had played with this in the past. The assignment to version has an 
interesting meaning of "collecting" everything assigned to it:

import std.stdio;

version (linux)
{
    version = linuxOrBSD;
    version = foo;
}

version (BSD)
{
    version = linuxOrBSD;
    version = foo;
}

void main()
{
    version (linuxOrBSD) {
        writeln("linux or BSD");
        // do something...
    } else {
        version (Windows) {
            // do something else
        } else {
            // do something else
            assert(false, "Unsupported operating system");
        }
    }

    // Later on even this works
    version (foo) {
        writeln("even foo!");
    }
}

Ali