Question

I have a piece of code saying

clock.start();
for (unordered_map <uint32_t,HostTraffic>::iterator internalIPItr = hostTraffic.begin();
     internalIPItr != hostTraffic.end();
     ++internalIPItr)
  {
     if (!pgBulkInserter.insert(NULL, internalIPItr -> first,
                                internalIPItr -> second.inboundFlows,
                                (void*)&(internalIPItr -> second.outboundPortIPs),
                                internalIPItr -> second.roles)) {
        return -1;
     }
     clock.incrementOperations();
  }

My problem is I don’t understand the meaning of

(void*)&(internalIPItr -> second.outboundPortIPs).

You can consider for(....) as

for (int internalItr = beginning -> end)

where the type of internalItr is unordered_map and internalItr->second gives an instance of HostTraffic.

Answer 1

The pointer to the address of internalIPItr->second.outboundPortIPs, given by &, is converted to void*.