tree.hh: an STL-like C++ tree class by Kasper Peeters <kasper.peeters@phi-sci.com> The tree.hh library for C++ provides an STL-like container class for n-ary trees, templated over the data stored at the nodes. Various types of iterators are provided (post-order, pre-order, and others). Where possible the access methods are compatible with the STL or alternative algorithms are available. The librar