move iterator_traits

Author: aothms

storage.h

@@ -198,11 +198,6 @@ class set_voxel_iterator {
 	const vec_n<3, size_t>& operator*() const { return current_; }
 };
 
-template <>
-struct std::iterator_traits<set_voxel_iterator> {
-	typedef std::forward_iterator_tag iterator_category;
-};
-
 struct obj_export_helper {
 	std::ostream* stream;
 	size_t vert_counter;
@@ -2037,4 +2032,11 @@ namespace {
 	}
 }
 
+namespace std {
+	template <>
+	struct iterator_traits<set_voxel_iterator> {
+		typedef forward_iterator_tag iterator_category;
+	};
+}
+
 #endif