add RefCount benchmark

src/shogun/CMakeLists.txt

@@ -573,6 +573,7 @@ IF (BUILD_BENCHMARKS)
 
   ADD_SHOGUN_BENCHMARK(features/RandomFourierDotFeatures_benchmark)
   ADD_SHOGUN_BENCHMARK(features/hashed/HashedDocDotFeatures_benchmark)
+  ADD_SHOGUN_BENCHMARK(lib/RefCount_benchmark)
 ENDIF()
 
 #############################################

src/shogun/lib/RefCount_benchmark.cc

@@ -0,0 +1,23 @@
+/*
+ * This software is distributed under BSD 3-clause license (see LICENSE file).
+ *
+ * Authors: Viktor Gal
+ */
+
+#include <benchmark/benchmark.h>
+
+#include "shogun/lib/RefCount.h"
+
+namespace shogun
+{
+
+static void BM_RefCount(benchmark::State& state)
+{
+	RefCount rf;
+	for (auto _ : state)
+		rf.ref();
+}
+
+BENCHMARK(BM_RefCount);
+
+}