avoiding forward declarations in stencil.hh

[address@hidden]

Hey all,

I'm doing some work on the stencil class and I have a programming question.

I'm experimenting with the following code:

class Stencil
{
  Box dim_;
  SCM expr_;
  Drul_array<Stencil> children_;

  etc...
}

and g++ gives me:

rm -f ./out/articulations.dep; DEPENDENCIES_OUTPUT="./out/articulations.dep 
./out/articulations.o" g++ -c -Woverloaded-virtual  -I/usr/include/python2.6 
-I/usr/include/python2.6 -fno-strict-aliasing  -g -fwrapv     -DHAVE_CONFIG_H  
-I./include -I./out -I../flower/include -I../flower/./out -I../flower/include  
-g -pipe -pthread -I/usr/include/freetype2   -pthread -I/usr/include/pango-1.0 
-I/usr/include/freetype2 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include   
-Wno-pmf-conversions  -W -Wall -Wconversion -o out/articulations.o 
articulations.cc
In file included from ../flower/include/interval.hh:26,
                 from ./include/lily-guile.hh:38,
                 from ./include/grob-info.hh:23,
                 from ./include/engraver.hh:23,
                 from articulations.cc:19:
../flower/include/drul-array.hh: In instantiation of 'Drul_array<Stencil>':
./include/stencil.hh:63:   instantiated from here
../flower/include/drul-array.hh:32: error: 'Drul_array<T>::array_' has 
incomplete type
./include/stencil.hh:60: error: forward declaration of 'class Stencil'
make: *** [out/articulations.o] Error 1

When I change the Drul_array to a vector, this problem goes away.  I would, 
however, like it to be a Drul_array (or even better, a pair, but pair gives me 
the same forward declaration error as Drul_array).  Does anyone know a way to 
declare this thing correctly so that I don't get the forward declaration error?

Cheers,
MS