From 0ec64c24477ac08929969c8a1192ea55afb5580a Mon Sep 17 00:00:00 2001
From: Adrian Baddeley <adrian.baddeley@uwa.edu.au>
Date: Sat, 2 Apr 2016 18:20:59 +0800
Subject: [PATCH] Fixed reverse iterator comparison

---
 DESCRIPTION     |  4 ++--
 src/clipper.cpp | 16 ++++++++--------
 2 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/DESCRIPTION b/DESCRIPTION
index 059951b..87c697a 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: polyclip
-Version: 1.5-5
-Date: 2016-03-31
+Version: 1.5-6
+Date: 2016-04-02
 Title: Polygon Clipping
 Authors@R: c(person("Angus", "Johnson", role = "aut", 
    	    comment="C++ original, http://www.angusj.com/delphi/clipper.php"),
diff --git a/src/clipper.cpp b/src/clipper.cpp
index 1fa2eea..2e88943 100644
--- a/src/clipper.cpp
+++ b/src/clipper.cpp
@@ -2680,8 +2680,8 @@ void Clipper::ProcessHorizontal(TEdge *horzEdge)
     eMaxPair = GetMaximaPair(eLastHorz);
 
   MaximaList::const_iterator maxIt;
-  MaximaList::const_reverse_iterator maxRit, maxRend;
-  if (m_Maxima.size() > 0)
+  MaximaList::const_reverse_iterator maxRit;
+  if (!m_Maxima.empty())
   {
       //get the first maxima in range (X) ...
       if (dir == dLeftToRight)
@@ -2694,9 +2694,9 @@ void Clipper::ProcessHorizontal(TEdge *horzEdge)
       else
       {
           maxRit = m_Maxima.rbegin();
-	  maxRend = m_Maxima.rend();
-          while (maxRit != maxRend && *maxRit > horzEdge->Bot.X) maxRit++;
-          if (maxRit != maxRend && *maxRit <= eLastHorz->Top.X)
+	  // reverse "!=" to work around a defect in early compilers
+          while(m_Maxima.rend() != maxRit && *maxRit > horzEdge->Bot.X) maxRit++;
+          if (m_Maxima.rend() != maxRit && *maxRit <= eLastHorz->Top.X)
               maxRit = m_Maxima.rend();
       }
   }
@@ -2714,7 +2714,7 @@ void Clipper::ProcessHorizontal(TEdge *horzEdge)
         //this code block inserts extra coords into horizontal edges (in output
         //polygons) whereever maxima touch these horizontal edges. This helps
         //'simplifying' polygons (ie if the Simplify property is set).
-        if (m_Maxima.size() > 0)
+        if (!m_Maxima.empty())
         {
             if (dir == dLeftToRight)
             {
@@ -2727,8 +2727,8 @@ void Clipper::ProcessHorizontal(TEdge *horzEdge)
             }
             else
             {
-	      maxRend = m_Maxima.rend();
-                while (maxRit != maxRend && *maxRit > e->Curr.X)
+	        // reverse "!=" to work around a defect in early compilers
+                while (m_Maxima.rend() != maxRit && *maxRit > e->Curr.X)
                 {
                   if (horzEdge->OutIdx >= 0 && !IsOpen)
                     AddOutPt(horzEdge, IntPoint(*maxRit, horzEdge->Bot.Y));