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

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raw_socket_service::assign

Assign an existing native socket to a raw socket.

boost::system::error_code assign(
    implementation_type & impl,
    const protocol_type & protocol,
    const native_handle_type & native_socket,
    boost::system::error_code & ec);