update_to_std_optional.patch


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diff --git a/applications/utilities/preProcessing/viewFactorsGen/viewFactorsGen.C b/applications/utilities/preProcessing/viewFactorsGen/viewFactorsGen.C
index 9e9c3d34..00b22082 100644
--- a/applications/utilities/preProcessing/viewFactorsGen/viewFactorsGen.C
+++ b/applications/utilities/preProcessing/viewFactorsGen/viewFactorsGen.C
@@ -119,7 +119,7 @@ typedef std::vector<Triangle>::iterator Iterator;
 typedef CGAL::AABB_triangle_primitive<K, Iterator> Primitive;
 typedef CGAL::AABB_traits<K, Primitive> AABB_triangle_traits;
 typedef CGAL::AABB_tree<AABB_triangle_traits> Tree;
-typedef boost::optional
+typedef std::optional
 <
     Tree::Intersection_and_primitive_id<Segment>::Type
 > Segment_intersection;