From f21148e0d43f608625e2277e9984b8d8d1f7a080 Mon Sep 17 00:00:00 2001
From: Joseph Lenox <lenox.joseph@gmail.com>
Date: Wed, 18 Jul 2018 22:26:13 -0500
Subject: [PATCH] Just detect support layer via virtual function instead of
 relying on typeid to save the day.

---
 xs/src/libslic3r/Layer.hpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/xs/src/libslic3r/Layer.hpp b/xs/src/libslic3r/Layer.hpp
index bf7aa7544..295c3b159 100644
--- a/xs/src/libslic3r/Layer.hpp
+++ b/xs/src/libslic3r/Layer.hpp
@@ -137,6 +137,9 @@ class Layer {
     void detect_surfaces_type();
     /// Processes the external surfaces
     void process_external_surfaces();
+
+    /// polymorphic id
+    virtual bool is_support() const { return false;}
     
     protected:
     size_t _id;     ///< sequential number of layer, 0-based
@@ -169,6 +172,9 @@ class SupportLayer : public Layer {
     /// Populated in SupportMaterial.pm in sub generate_toolpaths
     ExtrusionEntityCollection support_interface_fills;
 
+    /// polymorphic id
+    bool is_support() const override { return true;}
+
     protected:
     /// Constructor
     SupportLayer(size_t id, PrintObject *object, coordf_t height,