tree3.1: tree.hh: an STLlike C++ tree class

stl风格的多叉树。Thetree.hhlibraryforC++providesanSTL-likecontainerclassforn-arytrees,templatedoverthedatastoredatthenodes.Varioustypesofiteratorsareprovided(post-order,pre-order,andothers).WherepossibletheaccessmethodsarecompatiblewiththeSTLoralternativealgorithmsareavailable.Thelibraryis