[Boost-users] program_options: iterate variable_map

Hello! I'm looking for a way to "iterate" through a variable_map after the command line options were stored, in order to print out all the options, or all with newly values. I know that you can test if a specific options was read with the "count()" method, but this is cumbersome. Is there a possiblity to do that? Regards, Stephan.