I am using the following in my program for proof of concept. ( This was extracted straight from the documentation) boost::uuids::string_generator gen; boost::uuids::uuid u1 = gen("{01234567-89ab-cdef-0123456789abcdef}"); crashing in : template <typename CharIterator> uuid operator()(CharIterator begin, CharIterator end) const crashing at : *it_byte = get_value(c) Is this a bug or am I doing something wrong. When I remove the dashes it seems to work...... CONFIDENTIAL INFORMATION NOTICE: The information contained in this e-mail is privileged, confidential and intended solely for the use of the addressee named above. If the reader of this e-mail is not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this e-mail is strictly prohibited. If you received this in error, please contact the sender and destroy all copies of this e-mail. Thank you.