Add modifyLookahead to the rti abstraction.

simgear/hla/HLAFederate.cxx

@@ -113,6 +113,12 @@ HLAFederate::queryFederateTime(SGTimeStamp& timeStamp)
     return _rtiFederate->queryFederateTime(timeStamp);
 }
 
+bool
+HLAFederate::modifyLookahead(const SGTimeStamp& timeStamp)
+{
+    return _rtiFederate->modifyLookahead(timeStamp);
+}
+
 bool
 HLAFederate::queryLookahead(SGTimeStamp& timeStamp)
 {

simgear/hla/HLAFederate.hxx

@@ -59,6 +59,7 @@ public:
     bool timeAdvanceRequest(const SGTimeStamp& dt);
 
     bool queryFederateTime(SGTimeStamp& timeStamp);
+    bool modifyLookahead(const SGTimeStamp& timeStamp);
     bool queryLookahead(SGTimeStamp& timeStamp);
 
     /// Process messages

simgear/hla/RTI13Ambassador.hxx

@@ -387,6 +387,8 @@ public:
         _rtiAmbassador.queryFederateTime(fedTime);
         timeStamp = toTimeStamp(fedTime);
     }
+    void modifyLookahead(const SGTimeStamp& timeStamp)
+    { _rtiAmbassador.modifyLookahead(toFedTime(timeStamp)); }
     void queryLookahead(SGTimeStamp& timeStamp)
     {
         RTIfedTime fedTime;

simgear/hla/RTI13Federate.cxx

@@ -480,6 +480,37 @@ RTI13Federate::queryFederateTime(SGTimeStamp& timeStamp)
     return true;
 }
 
+bool
+RTI13Federate::modifyLookahead(const SGTimeStamp& timeStamp)
+{
+    if (!_ambassador.valid()) {
+        SG_LOG(SG_NETWORK, SG_WARN, "RTI: Could not modify lookahead.");
+        return false;
+    }
+    try {
+        _ambassador->modifyLookahead(timeStamp);
+    } catch (RTI::InvalidLookahead& e) {
+        SG_LOG(SG_NETWORK, SG_WARN, "RTI: Could not modify lookahead: " << e._name << " " << e._reason);
+        return false;
+    } catch (RTI::FederateNotExecutionMember& e) {
+        SG_LOG(SG_NETWORK, SG_WARN, "RTI: Could not modify lookahead: " << e._name << " " << e._reason);
+        return false;
+    } catch (RTI::ConcurrentAccessAttempted& e) {
+        SG_LOG(SG_NETWORK, SG_WARN, "RTI: Could not modify lookahead: " << e._name << " " << e._reason);
+        return false;
+    } catch (RTI::SaveInProgress& e) {
+        SG_LOG(SG_NETWORK, SG_WARN, "RTI: Could not modify lookahead: " << e._name << " " << e._reason);
+        return false;
+    } catch (RTI::RestoreInProgress& e) {
+        SG_LOG(SG_NETWORK, SG_WARN, "RTI: Could not modify lookahead: " << e._name << " " << e._reason);
+        return false;
+    } catch (RTI::RTIinternalError& e) {
+        SG_LOG(SG_NETWORK, SG_WARN, "RTI: Could not modify lookahead: " << e._name << " " << e._reason);
+        return false;
+    }
+    return true;
+}
+
 bool
 RTI13Federate::queryLookahead(SGTimeStamp& timeStamp)
 {

simgear/hla/RTI13Federate.hxx

@@ -61,6 +61,7 @@ public:
     virtual bool timeAdvanceRequest(const SGTimeStamp& fedTime);
 
     virtual bool queryFederateTime(SGTimeStamp& timeStamp);
+    virtual bool modifyLookahead(const SGTimeStamp& timeStamp);
     virtual bool queryLookahead(SGTimeStamp& timeStamp);
 
     /// Process messages

simgear/hla/RTIFederate.hxx

@@ -66,6 +66,7 @@ public:
     virtual bool timeAdvanceRequest(const SGTimeStamp& fedTime) = 0;
 
     virtual bool queryFederateTime(SGTimeStamp& timeStamp) = 0;
+    virtual bool modifyLookahead(const SGTimeStamp& timeStamp) = 0;
     virtual bool queryLookahead(SGTimeStamp& timeStamp) = 0;
 
     /// Process messages