Hi List Members, While still trying putting boost::multi_array to work I ran into the next obstacle - my current code is fairly like in the multi_array "short example" That is : #include "boost/multi_array.hpp" class NwLayer { typedef boost::multi_array<double,3> neural_op; typedef neural_op::index index ; neural_op NeuralOperator(boost::extents[10][10][10]); } unfortunately I still get the compile time error In file included from ../NwLayer.cpp:1: ../NwLayer.h:12: Fehler: >boost::extents< is not a type on the last line of the above code snippet Is there anyone around who could explain to me what I can do to get rid of the error message ? Many thanks in advance Best regards Stefan -------------------------------------------------------- Stefan Klett (Dipl. Informatiker) | E-mail: stefan.klett@kit.edu Forschungszentrum Karlsruhe / KIT | Web: http://www.fzk.de SCC Steinbuch Centre for Computing| Phone: +49 (0)7247 828649 Hermann-von-Helmholtz-Platz 1 | Fax: +49 (0)7247 824972 D-76344 Eggenstein-Leopoldshafen | Mobile: +49 (0)176 20317250 -------------------------------------------------------------------