cache benchmark and utils/time/timer improvement

src/experimental/cache_benchmark.cpp

@@ -0,0 +1,48 @@
+#include <iostream>
+
+#include "utils/time/timer.hpp"
+
+using std::cout;
+using std::endl;
+
+using ns = std::chrono::nanoseconds;
+using ms = std::chrono::milliseconds;
+
+constexpr long iterations_no = 10 * 1024 * 1024;
+
+struct DataShort
+{
+    long a;
+    long b;
+};
+
+struct DataLong
+{
+    long a;
+    long b;
+    long c;
+    long d;
+};
+
+DataShort *data_short = new DataShort[iterations_no];
+DataLong *data_long = new DataLong[iterations_no];
+
+int main()
+{
+    auto time_short = timer<ms>([]() {
+		for (long i = 0; i < iterations_no; i++) {
+			data_short[i].a = data_short[i].b;
+		}
+    });
+
+	auto time_long = timer<ms>([]() {
+		for (long i = 0; i < iterations_no; i++) {
+			data_long[i].a = data_long[i].b;
+		}
+	});
+
+	cout << "Time short: " << time_short << " ms"<< endl;
+	cout << "Time long: " << time_long << " ms" << endl;
+
+	return 0;
+}

src/utils/time/timer.hpp

@@ -1,19 +1,21 @@
 #pragma once
 
-#include <utility>
 #include <chrono>
-
-using time_point_t = std::chrono::high_resolution_clock::time_point;
-
-#define duration(a) \
-    std::chrono::duration_cast<std::chrono::nanoseconds>(a).count()
+#include <ratio>
+#include <utility>
 
 #define time_now() std::chrono::high_resolution_clock::now()
 
-template<typename F, typename... Args>
-double timer(F func, Args&&... args)
+template <typename DurationUnit = std::chrono::nanoseconds>
+auto to_duration(const std::chrono::duration<long, std::nano> &delta)
 {
-    time_point_t start_time = time_now();
-    func(std::forward<Args>(args)...);
-    return duration(time_now() - start_time);
+    return std::chrono::duration_cast<DurationUnit>(delta).count();
+}
+
+template <typename DurationUnit, typename F, typename... Args>
+auto timer(F func, Args &&... args)
+{
+    auto start_time = time_now();
+    func(std::forward<Args>(args)...);
+    return to_duration<DurationUnit>(time_now() - start_time);
 }

src/utils/type_discovery.hpp

@@ -1,7 +1,7 @@
 #pragma once
 
 // USAGE:
-//     type_name<decltype<variable>>();
+//     type_name<decltype(variable)>();
 // current solution has been taken from http://stackoverflow.com/questions/81870/is-it-possible-to-print-a-variables-type-in-standard-c
 // TODO: create more appropriate solution