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Right, you need to use boost::bind. Try:

ros::Subscriber sub = n.subscribe("topic-name", 1000, 
    boost::bind(writeOut, _1, cref(sound)));

Note that the call to cref is necessary because you want to pass a const reference instead of passing sound by value, i.e. copying it. If you want a normal reference, not a const reference, use ref.

Right, you need to use boost::bind. Try:

ros::Subscriber sub = n.subscribe("topic-name", 1000, 
    boost::bind(writeOut, _1, cref(sound)));
boost::cref(sound)));

Note that the call to cref is necessary because you want to pass a const reference instead of passing sound by value, i.e. copying it. If you want a normal reference, not a const reference, use ref.

Right, you need to use boost::bind. Try:

ros::Subscriber sub = n.subscribe("topic-name", 1000, 
    boost::bind(writeOut, _1, boost::cref(sound)));

Note that the call to cref is necessary because you want to pass a const reference instead of passing sound by value, i.e. copying it. If you want a normal reference, not a const reference, use ref.