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

Use the specified file to obtain the temporary Diffie-Hellman parameters.

boost::system::error_code use_tmp_dh_file(
    impl_type & impl,
    const std::string & filename,
    boost::system::error_code & ec);