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Close the file.
void close(
boost::system::error_code & ec);
This function is used to close the file. Any asynchronous read or write
operations will be cancelled immediately, and will complete with the
boost::asio::error::operation_aborted error.
Set to indicate what error occurred, if any. Note that, even if the function indicates an error, the underlying descriptor is closed.
boost::asio::stream_file file(my_context);
...
boost::system::error_code ec;
file.close(ec);
if (ec)
{
// An error occurred.
}