Re: version specific enum members

2009-10-30 Thread Phil Deets 
On Fri, 30 Oct 2009 06:38:44 -0500, Ary Borenszweig a...@esperanto.org.ar  
wrote:



Phil Deets wrote:
On Thu, 29 Oct 2009 18:28:12 -0500, Ary Borenszweig  
a...@esperanto.org.ar wrote:



Ellery Newcomer wrote:

 Unfortunately, that's going to be about the best you can do, unless
you're willing to play with string mixins and their ilk.


Or unless you create an enhancement request. That seems a very valid  
one.

 Done (on the main D list).


I meant a bugzilla enhancement, otherwise it'll get lost in the  
newsgroups.


Well, I wanted to gauge support for the idea. It turns out I found a  
string mixin workaround that works; so it isn't critical for me now.

version specific enum members

2009-10-29 Thread Phil Deets 
Hi, is there a way to add members to an enum based on conditional  
compilation symbols. I tried


enum Tag {
   A, B,
   version (symbol) {
  C, D,
   }
   E,
}

but it doesn't work. I know I could do

version (symbol) {
   enum Tag { A, B, C, D, E }
} else {
   enum Tag { A, B, E }
}

but I don't want to do that since in my case, there can be quite a few  
elements outside of the version, and I don't want to repeat them all.



--
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Re: version specific enum members

2009-10-29 Thread Ellery Newcomer 
Phil Deets wrote:
 Hi, is there a way to add members to an enum based on conditional
 compilation symbols. I tried
 
 enum Tag {
A, B,
version (symbol) {
   C, D,
}
E,
 }
 
 but it doesn't work. I know I could do
 
 version (symbol) {
enum Tag { A, B, C, D, E }
 } else {
enum Tag { A, B, E }
 }
 
 but I don't want to do that since in my case, there can be quite a few
 elements outside of the version, and I don't want to repeat them all.
 
 

Unfortunately, that's going to be about the best you can do, unless
you're willing to play with string mixins and their ilk.

Re: version specific enum members

2009-10-29 Thread Ary Borenszweig 

Ellery Newcomer wrote:

Phil Deets wrote:

Hi, is there a way to add members to an enum based on conditional
compilation symbols. I tried

enum Tag {
   A, B,
   version (symbol) {
  C, D,
   }
   E,
}

but it doesn't work. I know I could do

version (symbol) {
   enum Tag { A, B, C, D, E }
} else {
   enum Tag { A, B, E }
}

but I don't want to do that since in my case, there can be quite a few
elements outside of the version, and I don't want to repeat them all.




Unfortunately, that's going to be about the best you can do, unless
you're willing to play with string mixins and their ilk.


Or unless you create an enhancement request. That seems a very valid one.

Re: version specific enum members

2009-10-29 Thread Phil Deets 
On Thu, 29 Oct 2009 18:28:12 -0500, Ary Borenszweig a...@esperanto.org.ar  
wrote:



Ellery Newcomer wrote:

Phil Deets wrote:

Hi, is there a way to add members to an enum based on conditional
compilation symbols. I tried

enum Tag {
   A, B,
   version (symbol) {
  C, D,
   }
   E,
}

but it doesn't work. I know I could do

version (symbol) {
   enum Tag { A, B, C, D, E }
} else {
   enum Tag { A, B, E }
}

but I don't want to do that since in my case, there can be quite a few
elements outside of the version, and I don't want to repeat them all.



 Unfortunately, that's going to be about the best you can do, unless
you're willing to play with string mixins and their ilk.


Or unless you create an enhancement request. That seems a very valid one.


Done (on the main D list).

Re: version specific enum members

2009-10-29 Thread Daniel Keep 


Phil Deets wrote:
 Hi, is there a way to add members to an enum based on conditional
 compilation symbols. I tried
 
 enum Tag {
A, B,
version (symbol) {
   C, D,
}
E,
 }
 
 but it doesn't work. I know I could do
 
 version (symbol) {
enum Tag { A, B, C, D, E }
 } else {
enum Tag { A, B, E }
 }
 
 but I don't want to do that since in my case, there can be quite a few
 elements outside of the version, and I don't want to repeat them all.

template Version(char[] ident)
{
mixin(`version(`~ident~`) const Version = true;
   else const Version = false;`);
}

char[] genEnum(bool flag1, bool flag2)
{
return A, B, 
 ~ (flag1 ? C, D,  : )
 ~ E, F, 
 ~ (flag2 ? G, H,  : )
 ~ G, ;
}

mixin(genEnum( Version!(`symbol`), Version!(`somethingElse`) ));

... is about the best you can do, I think.

Re: version specific enum members

2009-10-29 Thread Phil Deets 
On Fri, 30 Oct 2009 00:03:23 -0500, Daniel Keep  
daniel.keep.li...@gmail.com wrote:





Phil Deets wrote:

Hi, is there a way to add members to an enum based on conditional
compilation symbols. I tried

enum Tag {
   A, B,
   version (symbol) {
  C, D,
   }
   E,
}

but it doesn't work. I know I could do

version (symbol) {
   enum Tag { A, B, C, D, E }
} else {
   enum Tag { A, B, E }
}

but I don't want to do that since in my case, there can be quite a few
elements outside of the version, and I don't want to repeat them all.


template Version(char[] ident)
{
mixin(`version(`~ident~`) const Version = true;
   else const Version = false;`);
}

char[] genEnum(bool flag1, bool flag2)
{
return A, B, 
 ~ (flag1 ? C, D,  : )
 ~ E, F, 
 ~ (flag2 ? G, H,  : )
 ~ G, ;
}

mixin(genEnum( Version!(`symbol`), Version!(`somethingElse`) ));

... is about the best you can do, I think.


Hey, thanks for the idea. I worked with it a little bit to remove the  
generator function and use multiline strings. This is what I came up with.


mixin(qENUM
enum Tag
{
   A, B,
ENUM~(Version!(symbol)?qENUM
   C, D,
ENUM:)~qENUM
   E,
}
ENUM);

That's not pretty, but it's good enough for me.