Construct an acceptor without opening it.

basic_socket_acceptor(
    boost::asio::io_service & io_service);

basic_socket_acceptor(
    boost::asio::io_service & io_service,
    const protocol_type & protocol);

basic_socket_acceptor(
    boost::asio::io_service & io_service,
    const endpoint_type & endpoint,
    bool reuse_addr = true);

basic_socket_acceptor(
    boost::asio::io_service & io_service,
    const protocol_type & protocol,
    const native_type & native_acceptor);