Excuse me, I'll post all of it this time :) Hi, Using boost 1.34.1, attempting a simple iteration over a std::list using BOOST_FOREACH and getting various compile errors all linked to mpl as below d:\Projects\boost\boost_1_34_1\boost/foreach.hpp(123) : error C3083: 'mpl': the symbol to the left of a '::' must be a type d:\Projects\boost\boost_1_34_1\boost/foreach.hpp(125) : see reference to class template instantiation 'Operations::boost::foreach::is_lightweight_proxy<T>' being compiled which relates to the following code in the header: //////////////////////////////////////////////////////////////////////// /////// // boost::foreach::is_lightweight_proxy // Specialize this for user-defined collection types if they are inexpensive to copy. // This tells BOOST_FOREACH it can avoid the rvalue/lvalue detection stuff. template<typename T> struct is_lightweight_proxy : boost::mpl::false_ { }; I have no idea what mpl is and haven't linked in any new libraries to allow use of foreach. Any ideas what I'm doing wrong? Thanks, Patrick ****************************************************************************** "This message and any attachments are solely for the intended recipient and may contain confidential and privileged information. If you are not the intended recipient, any disclosure, copying, use, or distribution of the information included in this message and any attachments is prohibited. If you have received this communication in error, please notify us by reply e-mail and immediately and permanently delete this message and any attachments. Thank you." Interactive Transaction Solutions Ltd (2473364 England) Registered Office: Systems House, Station Approach Emsworth PO10 7PW ********************************************************************** Ce message �lectronique contient des informations confidentielles � l'usage unique des destinataires indiqu�s, personnes physiques ou morales. Si vous n'�tes pas le destinataire voulu, toute divulgation, copie, ou diffusion ou toute autre utilisation de ces informations, est interdite. Si vous avez re�u ce message �lectronique par erreur, nous vous remercions d'en avertir son exp�diteur imm�diatement par email et de d�truire ce message ainsi que les �l�ments attach�s. Interactive transaction Solutions SAS- France (RCS Pontoise : 489 397 877) Si�ge social : Parc Saint Christophe, 10, Avenue de l�Entreprise 95865 Cergy-Pontoise Cedex ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________