I'm having trouble using std.boxer in code compiled into a lib. I've
recompiled phobos with all the debugging info I could and it was still
giving a link error not finding an unbox instantiation. The following two
files give an example
boxt.d:
import boxt2;
int main() {
  double x = foo!(double)(10);
  printf("%g\n",x);
  return 0;
}

boxt2.d:
module boxt2;
import std.boxer;
template foo(T) {
  T foo(int x){ return unbox!(T)(box(x)); }
}

This works fine if you compile like
  dmd boxt.d boxt2.d
but it fails to link if you do
  dmd -c boxt2.d
  dmd boxt.d boxt2.obj
With MinTL I'm using boxes to do implicit numeric conversions but since
MinTL is a library I compile everything down to objs and stuff them in a
lib. Hence I found the simplest thing for me to do is insert some dead code
into the code using MinTL to explicitly instatiate the right unbox function.
eg
boxt.d:
import boxt2;
import boxer;
int main() {
  unbox!(double)(box(10)); // dead code to get the template instantiated
  double x = foo!(double)(10);
  printf("%g\n",x);
  return 0;
}
I vaguely remember some discussions about instantiating templates across obj
files but I don't remember what the upshot was.

Ben, I have same problems with boxer.
Have not fixed them.
"Solution" - I am not assembling lib from objs at all.
AFAIR - problem is exactly the same as with any
template in debug mode. Librarian just don't like them.

Andrew.

"Ben Hinkle" <ben.hinkle@gmail.com> wrote in message news:d7r7kb$1rnj$1@digitaldaemon.com...
> I'm having trouble using std.boxer in code compiled into a lib. I've
> recompiled phobos with all the debugging info I could and it was still
> giving a link error not finding an unbox instantiation. The following two
> files give an example
> boxt.d:
> import boxt2;
> int main() {
>  double x = foo!(double)(10);
>  printf("%g\n",x);
>  return 0;
> }
>
> boxt2.d:
> module boxt2;
> import std.boxer;
> template foo(T) {
>  T foo(int x){ return unbox!(T)(box(x)); }
> }
>
> This works fine if you compile like
>  dmd boxt.d boxt2.d
> but it fails to link if you do
>  dmd -c boxt2.d
>  dmd boxt.d boxt2.obj
> With MinTL I'm using boxes to do implicit numeric conversions but since
> MinTL is a library I compile everything down to objs and stuff them in a
> lib. Hence I found the simplest thing for me to do is insert some dead
> code into the code using MinTL to explicitly instatiate the right unbox
> function. eg
> boxt.d:
> import boxt2;
> import boxer;
> int main() {
>  unbox!(double)(box(10)); // dead code to get the template instantiated
>  double x = foo!(double)(10);
>  printf("%g\n",x);
>  return 0;
> }
> I vaguely remember some discussions about instantiating templates across
> obj files but I don't remember what the upshot was.
>