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23 #ifndef INCLUDED_GR_NOP_H
24 #define INCLUDED_GR_NOP_H
48 static sptr make(
size_t sizeof_stream_item);
50 virtual int nmsgs_received()
const = 0;
52 virtual int ctrlport_test()
const = 0;
53 virtual void set_ctrlport_test(
int x) = 0;