From 2d3bfc296c0ba1b4e189d36d2d4ff984a464114f Mon Sep 17 00:00:00 2001
From: Adam Wulkiewicz <adam.wulkiewicz@gmail.com>
Date: Mon, 16 Feb 2015 18:12:06 +0100
Subject: [PATCH] [buffer] Add assertions checking segments indexes >= 0 in
 buffered_piece_collection.

---
 .../algorithms/detail/buffer/buffered_piece_collection.hpp     | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/boost/geometry/algorithms/detail/buffer/buffered_piece_collection.hpp b/include/boost/geometry/algorithms/detail/buffer/buffered_piece_collection.hpp
index cc0ab2b1a..4fb18d3e6 100644
--- a/include/boost/geometry/algorithms/detail/buffer/buffered_piece_collection.hpp
+++ b/include/boost/geometry/algorithms/detail/buffer/buffered_piece_collection.hpp
@@ -807,6 +807,9 @@ struct buffered_piece_collection
     {
         pc.offsetted_count = pc.last_segment_index - pc.first_seg_id.segment_index;
         BOOST_ASSERT(pc.offsetted_count >= 0);
+        BOOST_ASSERT(pc.first_seg_id.multi_index >= 0);
+        BOOST_ASSERT(pc.first_seg_id.segment_index >= 0);
+        BOOST_ASSERT(pc.last_segment_index >= 0);
 
         pc.robust_ring.reserve(pc.offsetted_count + helper_points_size);