From 2a4d9c98ee4ba40d4f5e8308aed6b46aae58739e Mon Sep 17 00:00:00 2001
From: Stephen Birarda <commit@birarda.com>
Date: Tue, 2 Jul 2013 10:34:57 -0700
Subject: [PATCH] add return of number of alive agents from AgentList

---
 libraries/shared/src/AgentList.cpp | 12 ++++++++++++
 libraries/shared/src/AgentList.h   |  1 +
 2 files changed, 13 insertions(+)

diff --git a/libraries/shared/src/AgentList.cpp b/libraries/shared/src/AgentList.cpp
index 2db1e68318..f438591d75 100644
--- a/libraries/shared/src/AgentList.cpp
+++ b/libraries/shared/src/AgentList.cpp
@@ -191,6 +191,18 @@ Agent* AgentList::agentWithID(uint16_t agentID) {
     return NULL;
 }
 
+int AgentList::numAliveAgents() const {
+    int numAliveAgents = 0;
+    
+    for (AgentList::iterator agent = begin(); agent != end(); agent++) {
+        if (agent->isAlive()) {
+            ++numAliveAgents;
+        }
+    }
+    
+    return numAliveAgents;
+}
+
 void AgentList::setAgentTypesOfInterest(const char* agentTypesOfInterest, int numAgentTypesOfInterest) {
     delete _agentTypesOfInterest;
     
diff --git a/libraries/shared/src/AgentList.h b/libraries/shared/src/AgentList.h
index c817adb6f3..44bab7aa97 100644
--- a/libraries/shared/src/AgentList.h
+++ b/libraries/shared/src/AgentList.h
@@ -63,6 +63,7 @@ public:
     void(*linkedDataCreateCallback)(Agent *);
     
     int size() { return _numAgents; }
+    int numAliveAgents() const;
     
     void lock() { pthread_mutex_lock(&mutex); }
     void unlock() { pthread_mutex_unlock(&mutex); }