From 58685a167d755b43fce59d45a43428bdc8accb4a Mon Sep 17 00:00:00 2001
From: Luke Simonson <simoluk@gmail.com>
Date: Mon, 7 Mar 2011 01:22:52 +0000
Subject: [PATCH] disabled 45-degree booleans optimization

[SVN r69614]
---
 include/boost/polygon/detail/polygon_set_view.hpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/include/boost/polygon/detail/polygon_set_view.hpp b/include/boost/polygon/detail/polygon_set_view.hpp
index 7b159a8..693acc4 100644
--- a/include/boost/polygon/detail/polygon_set_view.hpp
+++ b/include/boost/polygon/detail/polygon_set_view.hpp
@@ -14,7 +14,13 @@ namespace boost { namespace polygon{
   inline void polygon_set_data<coordinate_type>::clean() const {
     if(dirty_) {
       polygon_45_set_data<coordinate_type> tmp;
-      if(downcast(tmp) ) {
+      //very important:
+      //the 45 degree algorithm does not satisfy
+      //the precondition of arbitrary polygon formation
+      //that vertices be "linearly consistent"
+      //therefore it doesn't work to fall back on 45-degree
+      //booleans for arbitrary angle polygons
+      if(0) { //downcast(tmp) ) {
         tmp.clean();
         data_.clear();
         is_45_ = true;