[Boost-users] [tokenizer] mutable string iterator

Hi there, I would like to use the tokenizer to iterate through a string of words and reverse them. Something like this: string str( " Hello World" ); tokenizer<> tok(str); for(tokenizer<>::iterator beg=tok.begin(); beg!=tok.end();++beg) { reverse( (*beg).begin(), (*beg).end() ); } Why can't I get a mutable string iterator? Thanks, Christian