From 92f3c368b8685580353172e7979c7d7d816db21f Mon Sep 17 00:00:00 2001
From: frosch <frosch@openttd.org>
Date: Sat, 16 Aug 2008 14:02:20 +0000
Subject: (svn r14083) -Fix [FS#1264, FS#2037, FS#2038, FS#2110]: Rewrite the
 autoreplace kernel.

---
 src/train.h | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

(limited to 'src/train.h')

diff --git a/src/train.h b/src/train.h
index 0e92a962c..22ed95b04 100644
--- a/src/train.h
+++ b/src/train.h
@@ -247,6 +247,20 @@ static inline Vehicle *GetNextVehicle(const Vehicle *v)
 	return v->Next();
 }
 
+/** Get the previous real (non-articulated part) vehicle in the consist.
+ * @param w Vehicle.
+ * @return Previous vehicle in the consist.
+ */
+static inline Vehicle *GetPrevVehicle(const Vehicle *w)
+{
+	assert(w->type == VEH_TRAIN);
+
+	Vehicle *v = w->Previous();
+	while (v != NULL && IsArticulatedPart(v)) v = v->Previous();
+
+	return v;
+}
+
 /** Get the next real (non-articulated part and non rear part of dualheaded engine) vehicle in the consist.
  * @param v Vehicle.
  * @return Next vehicle in the consist.
@@ -260,6 +274,19 @@ static inline Vehicle *GetNextUnit(Vehicle *v)
 	return v;
 }
 
+/** Get the previous real (non-articulated part and non rear part of dualheaded engine) vehicle in the consist.
+ * @param v Vehicle.
+ * @return Previous vehicle in the consist.
+ */
+static inline Vehicle *GetPrevUnit(Vehicle *v)
+{
+	assert(v->type == VEH_TRAIN);
+	v = GetPrevVehicle(v);
+	if (v != NULL && IsRearDualheaded(v)) v = GetPrevVehicle(v);
+
+	return v;
+}
+
 void ConvertOldMultiheadToNew();
 void ConnectMultiheadedTrains();
 
-- 
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