[boost] Reading the contents of a directory

Hello :) I'm searching a library for C/C++ which can access directorys. I have read that the boost library can it. So I have downloaded and installed it. But I'm searching a function with which I can look up which files are in a directory. I'd like to say a directory to scan to the function. The function should return the names of the files in that directory and if possible the name of subdirs. Does anyone know this function? Thank you in advance :)