Added boost header

test/external/boost/geometry/strategies/side_info.hpp

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+// Boost.Geometry (aka GGL, Generic Geometry Library)
+
+// Copyright (c) 2007-2011 Barend Gehrels, Amsterdam, the Netherlands.
+// Copyright (c) 2008-2011 Bruno Lalande, Paris, France.
+// Copyright (c) 2009-2011 Mateusz Loskot, London, UK.
+
+// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
+// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
+
+// Use, modification and distribution is subject to the Boost Software License,
+// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_GEOMETRY_STRATEGIES_SIDE_INFO_HPP
+#define BOOST_GEOMETRY_STRATEGIES_SIDE_INFO_HPP
+
+
+#include <utility>
+
+
+namespace boost { namespace geometry
+{
+
+
+/*!
+\brief Class side_info: small class wrapping for sides (-1,0,1)
+*/
+class side_info
+{
+public :
+    inline side_info(int side_a1 = 0, int side_a2 = 0,
+            int side_b1 = 0, int side_b2 = 0)
+    {
+        sides[0].first = side_a1;
+        sides[0].second = side_a2;
+        sides[1].first = side_b1;
+        sides[1].second = side_b2;
+    }
+
+    template <int Which>
+    inline void set(int first, int second)
+    {
+        sides[Which].first = first;
+        sides[Which].second = second;
+    }
+
+    template <int Which, int Index>
+    inline int get() const
+    {
+        return Index == 0 ? sides[Which].first : sides[Which].second;
+    }
+
+
+    // Returns true if both lying on the same side WRT the other
+    // (so either 1,1 or -1-1)
+    template <int Which>
+    inline bool same() const
+    {
+        return sides[Which].first * sides[Which].second == 1;
+    }
+
+    inline bool collinear() const
+    {
+        return sides[0].first == 0
+            && sides[0].second == 0
+            && sides[1].first == 0
+            && sides[1].second == 0;
+    }
+
+    // If one of the segments is collinear, the other must be as well.
+    // So handle it as collinear.
+    // (In floating point margins it can occur that one of them is 1!)
+    inline bool as_collinear() const
+    {
+        return sides[0].first * sides[0].second == 0
+            || sides[1].first * sides[1].second == 0;
+    }
+
+    inline void reverse()
+    {
+        std::swap(sides[0], sides[1]);
+    }
+
+private :
+    std::pair<int, int> sides[2];
+
+};
+
+
+}} // namespace boost::geometry
+
+
+#endif // BOOST_GEOMETRY_STRATEGIES_SIDE_INFO_HPP