1 files changed, 19 insertions, 1 deletions
diff --git a/src/2geom/intersection.h b/src/2geom/intersection.h
index 848797682..ae4b50dd1 100644
--- a/src/2geom/intersection.h
+++ b/src/2geom/intersection.h
@@ -92,7 +92,7 @@ private:
 };
 
 
-// TODO: move into new header
+// TODO: move into new header?
 template <typename T>
 struct ShapeTraits {
     typedef Coord TimeType;
@@ -101,6 +101,24 @@ struct ShapeTraits {
     typedef Intersection<> IntersectionType;
 };
 
+template <typename A, typename B> inline
+std::vector< Intersection<A, B> > transpose(std::vector< Intersection<B, A> > const &in) {
+    std::vector< Intersection<A, B> > result;
+    for (std::size_t i = 0; i < in.size(); ++i) {
+        result.push_back(Intersection<A, B>(in[i].second, in[i].first, in[i].point()));
+    }
+    return result;
+}
+
+template <typename T> inline
+void transpose_in_place(std::vector< Intersection<T, T> > &xs) {
+    for (std::size_t i = 0; i < xs.size(); ++i) {
+        std::swap(xs[i].first, xs[i].second);
+    }
+}
+
+typedef Intersection<> ShapeIntersection;
+
 
 } // namespace Geom