The Boost Software License shows that software under this license is open-source. However, I can only find .hpp headers on boost.org's site and downloaded libraries. How to find the source code of the implementations of boost.org's libraries?
For the boost libraries that aren't header-only, their source code can be found in the libs
directory.
E.g. for boost::filesystem
:
.../boost_1_63_0/libs/filesystem/src
Note: the libs
directory is quite useful for all boost libraries, not just the non header-only libraries, since it usually contains library specific example and test code.