Adding upstream version 14.2.21.upstream/14.2.21upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 29 insertions, 0 deletions

diff --git a/src/boost/libs/hana/benchmark/measure.hpp b/src/boost/libs/hana/benchmark/measure.hpp
new file mode 100644
index 00000000..a477fefc
--- /dev/null
+++ b/src/boost/libs/hana/benchmark/measure.hpp
@@ -0,0 +1,29 @@
+// Copyright Louis Dionne 2013-2017
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_HANA_BENCHMARK_MEASURE_HPP
+#define BOOST_HANA_BENCHMARK_MEASURE_HPP
+
+#include <chrono>
+#include <iostream>
+
+
+namespace boost { namespace hana { namespace benchmark {
+    auto measure = [](auto f) {
+        constexpr auto repetitions = 500ull;
+        auto start = std::chrono::steady_clock::now();
+        for (auto i = repetitions; i > 0; --i) {
+            f();
+        }
+        auto stop = std::chrono::steady_clock::now();
+
+        auto time = std::chrono::duration_cast<std::chrono::duration<float>>(
+            (stop - start) / repetitions
+        );
+        std::cout << std::fixed;
+        std::cout << "[execution time: " << time.count() << "]" << std::endl;
+    };
+}}}
+
+#endif