Hi Erik, On Mon, 22 Jul 2002, Erik Arner wrote: yg-boo> yg-boo> Now, the default vertex_descriptor seems to be unsigned int. How yg-boo> do I change this to int? Also, where (in which file) is the yg-boo> default set? You can't change the type of the vertex_descriptor. You really should not even care what the type is, think of it as an opaque handle. If you need to associate an int with every vertex, add an internal vertex property. yg-boo> On another note: the online reference manual is pretty good in my yg-boo> opinion, but it's hard to get a real overview of the contents. It yg-boo> also lacks an index, making it hard to look up questions like the yg-boo> one above. Is the book any better in this respect? Any other yg-boo> references worth looking up - books or webpages? Yes, buy my book! :) http://www.awprofessional.com/catalog/product.asp?product_id={B7B10FCE-2354-4A3E-8792-FCFCECDB355D} http://www.amazon.com/exec/obidos/ASIN/0201729148/qid%3D1027613921/sr%3D11-1... Cheers, Jeremy ---------------------------------------------------------------------- Jeremy Siek http://php.indiana.edu/~jsiek/ Ph.D. Student, Indiana Univ. B'ton email: jsiek@osl.iu.edu C++ Booster (http://www.boost.org) office phone: (812) 855-3608 ----------------------------------------------------------------------