Merge commit '0f50c3deef6d8501e49db55a1daf9d4b25f8ce4d' as 'libs/Catch2'

libs/Catch2/include/internal/benchmark/detail/catch_timing.hpp

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+/*
+ *  Created by Joachim on 16/04/2019.
+ *  Adapted from donated nonius code.
+ *
+ *  Distributed under the Boost Software License, Version 1.0. (See accompanying
+ *  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+ */
+
+// Timing
+
+#ifndef TWOBLUECUBES_CATCH_DETAIL_TIMING_HPP_INCLUDED
+#define TWOBLUECUBES_CATCH_DETAIL_TIMING_HPP_INCLUDED
+
+#include "../catch_clock.hpp"
+#include "catch_complete_invoke.hpp"
+
+#include <tuple>
+#include <type_traits>
+
+namespace Catch {
+    namespace Benchmark {
+        template <typename Duration, typename Result>
+        struct Timing {
+            Duration elapsed;
+            Result result;
+            int iterations;
+        };
+        template <typename Clock, typename Func, typename... Args>
+        using TimingOf = Timing<ClockDuration<Clock>, Detail::CompleteType_t<FunctionReturnType<Func, Args...>>>;
+    } // namespace Benchmark
+} // namespace Catch
+
+#endif // TWOBLUECUBES_CATCH_DETAIL_TIMING_HPP_INCLUDED