From: Simon Sticko <simon@sticko.se>
Date: Tue, 28 Apr 2020 14:33:43 +0000 (+0200)
Subject: Implement hessian and laplacian on ConstantFunction.
X-Git-Tag: v9.2.0-rc1~164^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F9979%2Fhead;p=dealii.git

Implement hessian and laplacian on ConstantFunction.
---

diff --git a/include/deal.II/base/function.h b/include/deal.II/base/function.h
index 0bdf1c1027..b16d95a494 100644
--- a/include/deal.II/base/function.h
+++ b/include/deal.II/base/function.h
@@ -477,6 +477,14 @@ namespace Functions
       std::vector<std::vector<Tensor<1, dim, RangeNumberType>>> &gradients)
       const override;
 
+    virtual SymmetricTensor<2, dim, RangeNumberType>
+    hessian(const Point<dim> & point,
+            const unsigned int component = 0) const override;
+
+    virtual RangeNumberType
+    laplacian(const Point<dim> & point,
+              const unsigned int component = 0) const override;
+
     std::size_t
     memory_consumption() const;
 
diff --git a/include/deal.II/base/function.templates.h b/include/deal.II/base/function.templates.h
index 747ba3fe41..56cd3469b2 100644
--- a/include/deal.II/base/function.templates.h
+++ b/include/deal.II/base/function.templates.h
@@ -512,6 +512,24 @@ namespace Functions
   }
 
 
+
+  template <int dim, typename RangeNumberType>
+  SymmetricTensor<2, dim, RangeNumberType>
+  ConstantFunction<dim, RangeNumberType>::hessian(const Point<dim> &,
+                                                  const unsigned int) const
+  {
+    return SymmetricTensor<2, dim, RangeNumberType>();
+  }
+
+
+
+  template <int dim, typename RangeNumberType>
+  RangeNumberType
+  ConstantFunction<dim, RangeNumberType>::laplacian(const Point<dim> &,
+                                                    const unsigned int) const
+  {
+    return 0;
+  }
 } // namespace Functions
 
 //---------------------------------------------------------------------------