[fem] cleverer getMinMaxOfDiscreteFunction

dune/stuff/common/math.hh

@@ -194,8 +194,6 @@ protected:
   typedef boost::accumulators::stats<boost::accumulators::tag::max, boost::accumulators::tag::min,
                                      boost::accumulators::tag::mean> StatsType;
   boost::accumulators::accumulator_set<ElementType, StatsType> acc_;
-
-  MinMaxAvg(const ThisType& other);
 };
 
 //! bound \param var in [\param min,\param max]

dune/stuff/test/common_math.cc

@@ -84,6 +84,14 @@ struct MinMaxAvgTest : public testing::Test
 {
 };
 
+template <class MMType, class TypeParam>
+void mmCheck(const MMType& mma)
+{
+  EXPECT_TRUE(Dune::FloatCmp::eq(mma.min(), TypeParam(-4.0)));
+  EXPECT_TRUE(Dune::FloatCmp::eq(mma.max(), TypeParam(1.0)));
+  EXPECT_TRUE(Dune::FloatCmp::eq(mma.average(), TypeParam(-1.0)));
+}
+
 TYPED_TEST_CASE(MinMaxAvgTest, TestTypes);
 TYPED_TEST(MinMaxAvgTest, All)
 {
@@ -98,9 +106,9 @@ TYPED_TEST(MinMaxAvgTest, All)
   EXPECT_TRUE(Dune::FloatCmp::eq(mma.max(), TypeParam(1.0)));
   EXPECT_TRUE(Dune::FloatCmp::eq(mma.average(), TypeParam(0.0)));
   mma(-4);
-  EXPECT_TRUE(Dune::FloatCmp::eq(mma.min(), TypeParam(-4.0)));
-  EXPECT_TRUE(Dune::FloatCmp::eq(mma.max(), TypeParam(1.0)));
-  EXPECT_TRUE(Dune::FloatCmp::eq(mma.average(), TypeParam(-1.0)));
+  mmCheck<MinMaxAvg<TypeParam>, TypeParam>(mma);
+  mmb = mma;
+  mmCheck<MinMaxAvg<TypeParam>, TypeParam>(mmb);
 }
 
 TEST(OtherMath, Range)