From: Denis Davydov <davydden@gmail.com>
Date: Tue, 31 Jan 2017 08:59:23 +0000 (+0100)
Subject: FE_Enriched: code example for a constructor
X-Git-Tag: v8.5.0-rc1~181^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F3876%2Fhead;p=dealii.git

FE_Enriched: code example for a constructor
---

diff --git a/include/deal.II/fe/fe_enriched.h b/include/deal.II/fe/fe_enriched.h
index d61c498de7..527bc7a1eb 100644
--- a/include/deal.II/fe/fe_enriched.h
+++ b/include/deal.II/fe/fe_enriched.h
@@ -244,6 +244,18 @@ public:
    * Otherwise one would have to use different instance of this class for each
    * disjoint enriched domain.
    *
+   * If you don't plan to use this feature, you can utilize C++11 lambdas to
+   * define dummy functions. Below is an example which uses two functions with
+   * the first element to be enriched and a single function with the second one.
+   * @code
+   * FE_Enriched<dim> fe
+   * (&fe_base,
+   * {&fe_1, &fe_2},
+   * {{[=] (const typename Triangulation<dim>::cell_iterator &) -> const Function<dim> * {return &fe_1_function1;},
+   *   [=] (const typename Triangulation<dim>::cell_iterator &) -> const Function<dim> * {return &fe_1_function2;}},
+   *  {[=] (const typename Triangulation<dim>::cell_iterator &) -> const Function<dim> * {return &fe_2_function;}}});
+   * @endcode
+   *
    * @note When using the same finite element for enrichment with N
    * different functions, it is advised to have the second argument of size 1
    * and the last argument of size 1 x N. The same can be achieved by providing