From: Luca Heltai <luca.heltai@sissa.it>
Date: Wed, 24 Apr 2019 11:27:19 +0000 (+0200)
Subject: Added static_assert.
X-Git-Tag: v9.1.0-rc1~180^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F7932%2Fhead;p=dealii.git

Added static_assert.
---

diff --git a/include/deal.II/base/function_lib.h b/include/deal.II/base/function_lib.h
index ab7635e89a..adca58384c 100644
--- a/include/deal.II/base/function_lib.h
+++ b/include/deal.II/base/function_lib.h
@@ -1654,6 +1654,11 @@ namespace Functions
   CutOffFunctionTensorProduct<dim>::set_base()
   {
     initialized = true;
+    static_assert(
+      std::is_base_of<CutOffFunctionBase<1>, CutOffFunctionBaseType<1>>::value,
+      "You can only construct a CutOffFunctionTensorProduct function from "
+      "a class derived from CutOffFunctionBase.");
+
     for (unsigned int i = 0; i < dim; ++i)
       base[i].reset(new CutOffFunctionBaseType<1>(this->radius,
                                                   Point<1>(this->center[i]),