From 64ea015a06bed60f9e2e89a8d1dc27e0d6bea7de Mon Sep 17 00:00:00 2001
From: Petr Baudis <pasky@ucw.cz>
Date: Sun, 27 Nov 2011 02:48:28 +0100
Subject: [PATCH] Support for agent death

---
 agent.cc      | 15 +++++++++++++--
 agent.h       |  4 ++++
 connection.cc |  4 ++--
 connection.h  |  2 +-
 4 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/agent.cc b/agent.cc
index 4f016e1..d63f14d 100644
--- a/agent.cc
+++ b/agent.cc
@@ -30,6 +30,12 @@ agent::move_dir(int dir_x, int dir_y)
 	return true;
 }
 
+void
+agent::die(void)
+{
+	dead = true;
+}
+
 void
 agent::on_action_takes(void)
 {
@@ -42,7 +48,12 @@ agent::on_action_takes(void)
 void
 agent::on_tick(void)
 {
-	energy += world::sun_energy;
+	if (!dead) {
+		energy += world::sun_energy;
+
+		if (energy <= 0)
+			die();
+	}
 }
 
 void
@@ -57,7 +68,7 @@ agent::on_senses_update(void)
 		tile->tile_in_dir(0, 1).symbol(),
 		tile->tile_in_dir(-1, 0).symbol(),
 	};
-	conn->senses(tick_id, energy, around);
+	conn->senses(tick_id, dead, energy, around);
 }
 
 agent::~agent()
diff --git a/agent.h b/agent.h
index f9bf0f6..276fc4a 100644
--- a/agent.h
+++ b/agent.h
@@ -14,16 +14,20 @@ public:
 	class tile *tile;
 
 	int energy;
+	bool dead;
 
 	agent(int id_, class tile &tile_, class connection *conn_)
 	: id (id_), conn (conn_), tile (&tile_)
 	{
 		put_at(tile_);
 		energy = world::newborn_energy;
+		dead = false;
 	};
 
 	bool move_dir(int dir_x, int dir_y);
 
+	void die(void);
+
 	void on_action_takes(void);
 	void on_tick(void);
 	void on_senses_update(void);
diff --git a/connection.cc b/connection.cc
index f54cb41..124df8d 100644
--- a/connection.cc
+++ b/connection.cc
@@ -11,10 +11,10 @@
 #include "connection.h"
 
 void
-connection::senses(int tick_id, int energy, char around[4])
+connection::senses(int tick_id, bool dead, int energy, char around[4])
 {
 	char buf[1024];
-	snprintf(buf, sizeof(buf), "tick %d\nenergy %d\naround %c%c%c%c\n\n", tick_id, energy, around[0], around[1], around[2], around[3]);
+	snprintf(buf, sizeof(buf), "tick %d\n%senergy %d\naround %c%c%c%c\n\n", tick_id, dead ? "DEAD\n" : "", energy, around[0], around[1], around[2], around[3]);
 
 	pthread_mutex_lock(&buf_lock);
 	out_buf.append(buf);
diff --git a/connection.h b/connection.h
index 36f98df..ff98597 100644
--- a/connection.h
+++ b/connection.h
@@ -26,7 +26,7 @@ public:
 		close(fd);
 	}
 
-	void senses(int tick_id, int energy, char around[4]);
+	void senses(int tick_id, bool dead, int energy, char around[4]);
 	void actions(class agent *);
 
 	void cancel(void);