Re: Our template emission strategy is broken

[deadalnix via Digitalmars-d]

On Friday, 13 November 2015 at 04:03:23 UTC, Walter Bright wrote:
On 11/12/2015 5:14 PM, deadalnix wrote:
module a;
struct S(E) {
     import std.bitfield;
     mixin(bitfield!(
         bool, "flag", 1,
         T, "myT", SizeOf!T,
         uint, "", 32 - SizeOf!T - 1,
     ));
}

module b;

enum MyEnum { Val1, Val2, Val3 }

import a;
alias UsefulStruct = S!MyEnum; // Boom, MyEnum is undefined

Now you end up having to tie stupid node into your code, like 
adding all user of
library X as import in library X. Which sucks, but is forced 
by the language
design.


The trouble there is that E is turned into MyEnum in the mixin 
string, and MyEnum would be unknown to module a.

You can file an enhancement request on this in bugzilla if you 
like.

I know what the problem is. Hence you need to import a in b and b 
in a. There is not really anyway around this because this is 
intrinsically how mixin works.