Passing a module in a template parameter list to __traits(allMembers, module)

[Andrej Mitrovic]

On Tuesday, 26 February 2013 at 19:03:01 UTC, Ben Gertzfield 
wrote:
> Hi folks,
>
> In preparation for my upcoming talk at DConf 2013, I'm working 
> on a compile-time dependency injection prototype for D.
>
> I'd like part of public interface for this system to take a 
> module at compile time, and return a list of the classes in 
> that module. Something like:
>
> string GetMembers(T)() {
>   auto members = [__traits(allMembers, T)];
>   return join(result, ", ");
> }

Use an alias:

string GetMembers(alias T)() {
   auto members = [__traits(allMembers, T)];
   return join(members, ", ");
}

void main() {
   stdout.writefln("Got members: %s", GetMembers!(std.stdio));
}

Also make sure you parenthesize the call in GetMembers. For some 
reason these two are different:

GetMembers!std.stdio  // actually calls (GetMembers!std).stdio
GetMembers!(std.stdio)

That could be a bug though.