Move-assign a basic_socket_acceptor from another.

basic_socket_acceptor & operator=(
    basic_socket_acceptor && other);
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Move-assign a basic_socket_acceptor from an acceptor of another protocol type.

template<
    typename Protocol1>
enable_if< is_convertible< Protocol1, Protocol >::value, basic_socket_acceptor >::type & operator=(
    basic_socket_acceptor< Protocol1 > && other);
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