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### placeholders::bytes_transferred

An argument placeholder, for use with boost::bind(), that corresponds to the bytes_transferred argument of a handler for asynchronous functions such as `boost::asio::basic_stream_socket::async_write_some` or `boost::asio::async_write`.

    unspecified bytes_transferred;

##### Requirements

Header: `boost/asio/placeholders.hpp`

Convenience header: `boost/asio.hpp`