using boost::shared_ptr;
using boost::function;
-ContentList overlaps (ContentList cl, function<shared_ptr<ContentPart> (shared_ptr<const Content>)> part, DCPTime from, DCPTime to)
+ContentList overlaps (ContentList cl, function<bool (shared_ptr<const Content>)> part, DCPTime from, DCPTime to)
{
ContentList overlaps;
DCPTimePeriod period (from, to);