Incomplete work for porting BoundingBox to XS

xs/src/Layer.hpp

@@ -0,0 +1,13 @@
+#ifndef slic3r_Layer_hpp_
+#define slic3r_Layer_hpp_
+
+#include <myinit.h>
+
+namespace Slic3r {
+
+typedef std::pair<coordf_t,coordf_t> t_layer_height_range;
+typedef std::map<t_layer_height_range,coordf_t> t_layer_height_ranges;
+
+}
+
+#endif