From e64dcf5e59bf945c016b14b8539f8871993de415 Mon Sep 17 00:00:00 2001
From: bubnikv <bubnikv@gmail.com>
Date: Tue, 13 Dec 2016 19:39:20 +0100
Subject: [PATCH] VS2013 could compile this, let's hope GCC will as well.

---
 xs/src/libslic3r/ClipperUtils.cpp | 8 ++++----
 xs/src/libslic3r/ClipperUtils.hpp | 4 ++--
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/xs/src/libslic3r/ClipperUtils.cpp b/xs/src/libslic3r/ClipperUtils.cpp
index e0de33586..69ba3bfa3 100644
--- a/xs/src/libslic3r/ClipperUtils.cpp
+++ b/xs/src/libslic3r/ClipperUtils.cpp
@@ -188,7 +188,7 @@ Slic3rMultiPoints_to_ClipperPaths(const T &input)
     return retval;
 }
 
-ClipperLib::Paths _offset(ClipperLib::Paths &input, ClipperLib::EndType endType, const float delta, ClipperLib::JoinType joinType, double miterLimit)
+ClipperLib::Paths _offset(ClipperLib::Paths &&input, ClipperLib::EndType endType, const float delta, ClipperLib::JoinType joinType, double miterLimit)
 {
     // scale input
     scaleClipperPolygons(input);
@@ -208,11 +208,11 @@ ClipperLib::Paths _offset(ClipperLib::Paths &input, ClipperLib::EndType endType,
     return retval;
 }
 
-ClipperLib::Paths _offset(ClipperLib::Path &input, ClipperLib::EndType endType, const float delta, ClipperLib::JoinType joinType, double miterLimit)
+ClipperLib::Paths _offset(ClipperLib::Path &&input, ClipperLib::EndType endType, const float delta, ClipperLib::JoinType joinType, double miterLimit)
 {
     ClipperLib::Paths paths;
-    paths.push_back(input);
-	return _offset(paths, endType, delta, joinType, miterLimit);
+    paths.push_back(std::move(input));
+	return _offset(std::move(paths), endType, delta, joinType, miterLimit);
 }
 
 // This is a safe variant of the polygon offset, tailored for a single ExPolygon:
diff --git a/xs/src/libslic3r/ClipperUtils.hpp b/xs/src/libslic3r/ClipperUtils.hpp
index 0a28c3932..6d3fe73ee 100644
--- a/xs/src/libslic3r/ClipperUtils.hpp
+++ b/xs/src/libslic3r/ClipperUtils.hpp
@@ -30,8 +30,8 @@ T ClipperPaths_to_Slic3rMultiPoints(const ClipperLib::Paths &input);
 Slic3r::ExPolygons ClipperPaths_to_Slic3rExPolygons(const ClipperLib::Paths &input);
 
 // offset Polygons
-ClipperLib::Paths _offset(ClipperLib::Path &input, ClipperLib::EndType endType, const float delta, ClipperLib::JoinType joinType, double miterLimit);
-ClipperLib::Paths _offset(ClipperLib::Paths &input, ClipperLib::EndType endType, const float delta, ClipperLib::JoinType joinType, double miterLimit);
+ClipperLib::Paths _offset(ClipperLib::Path &&input, ClipperLib::EndType endType, const float delta, ClipperLib::JoinType joinType, double miterLimit);
+ClipperLib::Paths _offset(ClipperLib::Paths &&input, ClipperLib::EndType endType, const float delta, ClipperLib::JoinType joinType, double miterLimit);
 inline Slic3r::Polygons offset(const Slic3r::Polygon &polygon, const float delta, ClipperLib::JoinType joinType = ClipperLib::jtMiter,  double miterLimit = 3)
     { return ClipperPaths_to_Slic3rMultiPoints<Polygons>(_offset(Slic3rMultiPoint_to_ClipperPath(polygon), ClipperLib::etClosedPolygon, delta, joinType, miterLimit)); }
 inline Slic3r::Polygons offset(const Slic3r::Polygons &polygons, const float delta, ClipperLib::JoinType joinType = ClipperLib::jtMiter, double miterLimit = 3)