GiNaC/ginac ex.h

[Christian Bauer]

Update of /home/cvs/GiNaC/ginac

Modified Files:
	ex.h 
Log Message:
Improved the pre-/postorder iterators: They visit the root node and are now
only marginally slower than a recursive function like traverse(). The only
remaining problem is that for an expression consisting of only one primitive
object, ex::begin() and ex::end() return the same value, so the iteration
immediately stops without visiting the one existing node. We probably need
special versions of begin()/end() for creating pre-/postorder iterators after
all.