[Issue 19495] Lack of version conjunctions

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19495

anonymous4 <dfj1esp02 at sneakemail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |spec
           Hardware|x86                         |All
                 OS|Mac OS X                    |All

--- Comment #1 from anonymous4 <dfj1esp02 at sneakemail.com> ---
Currently version statement is optimized for speed, you can have arbitrary
logic with static if.

---
template Defined(string s)
{
    mixin(`version(`~s~`)enum Defined=true;else enum Defined=false;`);
}

struct SVersion
{
    alias opDispatch(string s)=Defined!s;
}
enum Version=SVersion();

int main()
{
    static if(Version.OSX)writeln("running OSX");
    else writeln("no");
    return 0;
}
---

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