Just noticed this from http://89.151.96.106/forums/viewtopic.php?f=1&t=54587&start=25
There’s two topics haunting me on this forum:
This one, and a topic where I managed to write that OPCODE was messy code!
Pierre Terdiman commented on that, of course.
That was years ago, but I clearly remember it.
Looking at OPCODE now, of course I realise that it’s actually remarkably clean code!
All you people who complained about the coding style in OPCODE - you know who you are -, take that! 
January 16th, 2011 at 7:48 am
Saying that OPCODE was messy doesnt haunt me, especially not after writing my own similar code (and even adding to the mess in certain non public versions).
However the messyness is mostly due to the subset of C++ used and the way it handles different tree permutations/options…