From b7a6f998a75556861185728faabbf2cf7b79a4e7 Mon Sep 17 00:00:00 2001
From: Bruno Turcksin <bruno.turcksin@gmail.com>
Date: Fri, 11 Sep 2020 20:45:34 +0000
Subject: [PATCH] Add constructor to GridIn that directly attaches the
 Triangulation

---
 include/deal.II/grid/grid_in.h | 5 +++++
 source/grid/grid_in.cc         | 9 +++++++++
 2 files changed, 14 insertions(+)

diff --git a/include/deal.II/grid/grid_in.h b/include/deal.II/grid/grid_in.h
index 17062b68ff..56bacfe3fd 100644
--- a/include/deal.II/grid/grid_in.h
+++ b/include/deal.II/grid/grid_in.h
@@ -341,6 +341,11 @@ public:
    */
   GridIn();
 
+  /**
+   * Constructor. Attach this triangulation to be fed with the grid data.
+   */
+  GridIn(Triangulation<dim, spacedim> &tria);
+
   /**
    * Attach this triangulation to be fed with the grid data.
    */
diff --git a/source/grid/grid_in.cc b/source/grid/grid_in.cc
index e60737bf93..421e30db9c 100644
--- a/source/grid/grid_in.cc
+++ b/source/grid/grid_in.cc
@@ -96,6 +96,15 @@ GridIn<dim, spacedim>::GridIn()
 {}
 
 
+
+template <int dim, int spacedim>
+GridIn<dim, spacedim>::GridIn(Triangulation<dim, spacedim> &t)
+  : tria(&t, typeid(*this).name())
+  , default_format(ucd)
+{}
+
+
+
 template <int dim, int spacedim>
 void
 GridIn<dim, spacedim>::attach_triangulation(Triangulation<dim, spacedim> &t)
-- 
2.39.5