[boost] [Filesystem] Getting default directories

Hi all, are there any plans to add functions to Boost.Filesystem to get different default directories such as get_user_home_dir(), get_app_config_dir(), get_system_config_dir() et.al.? On Windows these probably would map directly to the SHGetFolderLocation() function, on *nix based systems these could map to some equivalent environment variable (i.e. $HOME) or some convention (i.e. system config files are in /etc/...). Surely there are some conventions for other systems as well. Regards Hartmut