Boost modules that would make sense to use:

• hana (metaprogramming and constexpr voodoo): http://boostorg.github.io/hana/
• iostreams (iostreams, memory mapping and optional compression) but minus the regex-part and compression optional: http://www.boost.org/doc/libs/1_61_0/libs/iostreams/doc/index.html
• cannot use boost::serialization because it is not header-only, maybe use cereal instead?
• ...?
• definitely nothing that is now in the STL!