added code from fusion2016

code/frank/BeaconObservation.h

@@ -0,0 +1,41 @@
+#ifndef BEACONOBSERVATION_H
+#define BEACONOBSERVATION_H
+
+#include "MACAddress.h"
+#include <vector>
+
+
+/** one observed AP and its signal strength */
+struct BeaconObservationEntry {
+
+	/** the timestamp this beacon was discovered at */
+	uint64_t ts;
+
+	/** the beacon's mac address */
+	std::string mac;
+
+	/** the beacon's rssi */
+	int rssi;
+
+	BeaconObservationEntry() : ts(0), mac(), rssi(0) {;}
+	BeaconObservationEntry(const uint64_t ts, const std::string& mac, const int rssi) : ts(ts), mac(mac), rssi(rssi) {;}
+
+};
+
+/** all APs observed during one scan */
+struct BeaconObservation {
+
+	std::vector<BeaconObservationEntry> entries;
+
+	void removeOld(uint64_t latestTS) {
+		auto lambda = [latestTS] (const BeaconObservationEntry& e) {
+			uint64_t age = latestTS - e.ts;
+			return age > 1000*3;
+		};
+		entries.erase(std::remove_if(entries.begin(), entries.end(), lambda), entries.end());
+	}
+
+};
+
+
+#endif // BEACONOBSERVATION_H