[Boost-users] [boost-spirit qi] internal copies

Hello *, I think this is more the question to spirit devlopers. I would like to know how spirit internally maintains the parsed data? Here is an example of what I mean. I have to parse some byte sequence represented as hex pairs: 00 ce ab 00 de ad be ef ... If I use the parser like this: boost::spirit::qi::uint_parser hex_byte; std::string str("..."); std::vector vec; iter_type curr=str.begin(), end=str.end(); bool r=phrase_parse(curr, end, +hex_byte, space, vec); Is vec going to be copied somewhere inside of qi? Or are the bytes directly appended to the vec? I would like to reserver some space for the maximum possible input and avoid additional internal copies inside of qi... How does the behaviour changes std::vector is part of the fusion::map like fusion::map < fusion::pair , fusion::pair ... , fusion::pair >

data_item;

Are the fields of the map used directly while parsing, or are there some temporaries, which will be first created (somewhere inside qi core) and filled with data and afterwards assigned to the corresponding map field? Many thanks for the gread lib! Ovanes