Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

Boost.Serialization Support

Support for serialization comes in two forms:

Classes number, debug_adaptor, logged_adaptor and rational_adaptor have "pass through" serialization support which requires the underlying backend to be serializable.
Backends cpp_int, cpp_bin_float, cpp_dec_float and float128 have full support for Boost.Serialization.