Hi Janos, The *_cc.cpp programs are not meant to be executed. They are "concept checking" programs meant to catch compile-time problems. See the following URL for more information about concept checking: http://www.boost.org/libs/concept_check/concept_check.htm Cheers, Jeremy On Fri, 14 Dec 2001, Janos Murvai wrote: murvai> murvai> Hi, murvai> murvai> I tried other programs: murvai> murvai> g++ -ftemplate-depth-30 -I /net/cooler/vol/export/proteome/murvai/CC/BOOST/boost_1_26_0/ bfs_cc.cpp murvai> murvai> Then the program (a.out) run more than 1 minutes and didn't stop. (I murvai> killed..) is it ok? murvai> murvai> other two program: dfs_cc.cpp dijkstra_cc.cpp ---------------------------------------------------------------------- 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 ----------------------------------------------------------------------