From 2f9f45433430e799904b821ecf3deba28c995263 Mon Sep 17 00:00:00 2001
From: Adam Wulkiewicz <adam.wulkiewicz@gmail.com>
Date: Wed, 2 Apr 2014 20:21:32 +0200
Subject: [PATCH] [get_turns] fix for MultiLinestrings containing Ls with equal
 points

In this case no sections were generated for those "empty" Linestrings but if there were some sections already generated they could be marked as last_non_duplicated.
---
 .../geometry/algorithms/detail/sections/sectionalize.hpp | 2 +-
 test/algorithms/overlay/get_turns_linear_linear.cpp      | 9 +++++++--
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/include/boost/geometry/algorithms/detail/sections/sectionalize.hpp b/include/boost/geometry/algorithms/detail/sections/sectionalize.hpp
index 71c3a9bb1..c4b6ac7c5 100644
--- a/include/boost/geometry/algorithms/detail/sections/sectionalize.hpp
+++ b/include/boost/geometry/algorithms/detail/sections/sectionalize.hpp
@@ -285,7 +285,7 @@ struct sectionalize_part
         section_type section;
 
         bool mark_first_non_duplicated = true;
-        std::size_t last_non_duplicate_index = 0;
+        std::size_t last_non_duplicate_index = sections.size();
 
         iterator_type it = boost::begin(range);
         
diff --git a/test/algorithms/overlay/get_turns_linear_linear.cpp b/test/algorithms/overlay/get_turns_linear_linear.cpp
index ebaff5128..63dae1734 100644
--- a/test/algorithms/overlay/get_turns_linear_linear.cpp
+++ b/test/algorithms/overlay/get_turns_linear_linear.cpp
@@ -22,14 +22,15 @@
 
 //TEST
 //#include <to_svg.hpp>
-//#include <boost/geometry.hpp>
-//#include <boost/geometry/multi/geometries/multi_linestring.hpp>
+#include <boost/geometry.hpp>
+#include <boost/geometry/multi/geometries/multi_linestring.hpp>
 
 template <typename T>
 void test_all()
 {
     typedef bg::model::point<T, 2, bg::cs::cartesian> pt;
     typedef bg::model::linestring<pt> ls;
+    typedef bg::model::multi_linestring<ls> mls;
 
     test_geometry<ls, ls>("LINESTRING(0 0,2 0)", "LINESTRING(0 0,2 0)", "tii", "txx");
     test_geometry<ls, ls>("LINESTRING(0 0,2 0)", "LINESTRING(2 0,0 0)", "tix", "txi");
@@ -120,6 +121,10 @@ void test_all()
     //    to_svg<ls, ls>("LINESTRING(31 0,15 0,10 5,5 5,4 0,1 0,0 0,-1 1)", "LINESTRING(-1 -1,0 0,1 0,2 0,2.5 1,3 0,30 0)", "test33.svg");
     //    to_svg<ls, ls>("LINESTRING(31 0,15 0,10 5,5 5,4 0,1 0,0 0,-1 1)", "LINESTRING(30 0,3 0,2.5 1,2 0,1 0,0 0,-1 -1)", "test34.svg");
     //}
+
+    test_geometry<mls, mls>("MULTILINESTRING((0 0,10 0,30 0))",
+                            "MULTILINESTRING((0 10,5 0,20 0,20 0,30 0),(2 0,2 0),(3 0,3 0,3 0))",
+                            expected("mii")("ccc")("ccc")("txx"));
 }
 
 int test_main(int, char* [])