Hello, This code does not compile: #include <boost/tokenizer.hpp> #include <iostream> const char test_string[] = "|abc|def||g|u|||"; int main(int argc, char *argv[]) { typedef boost::tokenizer<boost::char_separator<char>, const char *, const char *> tokenizer_t; const boost::char_separator<char> sep("|"); const tokenizer_t tok(test_string, test_string + sizeof(test_string) - 1, sep); tokenizer_t::const_iterator i = tok.begin(); return 0; } The compilation error is: In file included from /usr/include/boost/token_iterator.hpp:24, from /usr/include/boost/tokenizer.hpp:20, from tokenizer.cc:1: /usr/include/boost/token_functions.hpp: In static member function ‘static void boost::tokenizer_detail::assign_or_plus_equal<IteratorTag>::assign(Iterator, Iterator, Token&) [with Iterator = const char*, Token = const char*, IteratorTag = std::random_access_iterator_tag]’: /usr/include/boost/token_functions.hpp:458: instantiated from ‘bool boost::char_separator<Char, Traits>::operator()(InputIterator&, InputIterator, Token&) [with InputIterator = const char*, Token = const char*, Char = char, Traits = std::char_traits<char>]’ /usr/include/boost/token_iterator.hpp:70: instantiated from ‘void boost::token_iterator<TokenizerFunc, Iterator, Type>::initialize() [with TokenizerFunc = boost::char_separator<char, std::char_traits<char> >, Iterator = const char*, Type = const char*]’ /usr/include/boost/token_iterator.hpp:77: instantiated from ‘boost::token_iterator<TokenizerFunc, Iterator, Type>::token_iterator(TokenizerFunc, Iterator, Iterator) [with TokenizerFunc = boost::char_separator<char, std::char_traits<char> >, Iterator = const char*, Type = const char*]’ /usr/include/boost/tokenizer.hpp:86: instantiated from ‘typename boost::token_iterator_generator<TokenizerFunc, Iterator, Type>::type boost::tokenizer<TokenizerFunc, Iterator, Type>::begin() const [with TokenizerFunc = boost::char_separator<char, std::char_traits<char> >, Iterator = const char*, Type = const char*]’ tokenizer.cc:12: instantiated from here /usr/include/boost/token_functions.hpp:227: error: request for member ‘assign’ in ‘t’, which is of non-class type ‘const char*’ The compiler is g++ 4.4.5. The version of boost is 1.42 but the token_functions.hpp, token_iterator.hpp, and tokenizer.hpp files are almost identical in 1.45. I've traced the error to the fact that get_iterator_category<const char *>::iterator_category is std::random_access_iterator_tag but the assign_or_plus_equal<IteratorTag> is specialized for std::input_iterator_tag only and not for std::random_access_iterator_tag. Sorin