Move-assign a basic_socket from another.

basic_socket & operator=(
    basic_socket && other);
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Move-assign a basic_socket from a socket of another protocol type.

template<
    typename Protocol1,
    typename SocketService1>
enable_if< is_convertible< Protocol1, Protocol >::value, basic_socket >::type & operator=(
    basic_socket< Protocol1, SocketService1 > && other);
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