in program_options::parse_command_line - why can't the the argument "argv" be of type 'const charT*' rather than 'charT*'? i ask because our unit tests were giving a bunch of errors because they were written like this.. vector< char* > cmdLine; cmdLine.push_back( "someExec" ); cmdLine.push_back( "--optflag1" ); cmdLine.push_back( "value1" ); etc. then... char ** argv = &cmdLine[ 0 ]; then passing this to parse_command_line. when we compile under g++ 4.x we get warnings that assigning string literals to char* is a deprecated conversion. Actually I agree with the rationale, but this leaves me with a problem calling parse_command_line. Is it going to change any of these values? I know the c standard calls for the argv in main's prototype to be non-const, but why can't parse_command_line be more restrictive?