add profiling code

src/Profiling.cpp

@@ -0,0 +1,41 @@
+#include "Profiling.h"
+
+prof::Duration prof::duration(const TimePoint& start, const TimePoint& end) {
+    return end - start;
+}
+prof::TimePoint prof::now() {
+    return std::chrono::high_resolution_clock::now();
+}
+prof::Duration prof::UnitProfileCollection::average_duration(const std::string& unit) {
+    return m_map->operator[](unit).average_duration();
+}
+
+size_t prof::UnitProfileCollection::measurement_count(const std::string& unit) {
+    return m_map->operator[](unit).measurement_count();
+}
+
+void prof::UnitProfileCollection::add_sample(const std::string& unit, const Duration& duration) {
+    m_map->operator[](unit).add_sample(duration);
+}
+
+size_t prof::UnitExecutionTime::measurement_count() {
+    return m_measurements->size();
+}
+
+prof::Duration prof::UnitExecutionTime::average_duration() const {
+    auto measurements = m_measurements.synchronize();
+    Duration sum {};
+    for (const auto& measurement : *measurements) {
+        sum += measurement;
+    }
+    return sum / measurements->size();
+}
+
+void prof::UnitExecutionTime::add_sample(const Duration& dur) {
+    m_measurements->push_back(dur);
+}
+
+prof::UnitExecutionTime::UnitExecutionTime()
+    : m_measurements(boost::circular_buffer<Duration>(16)) {
+}
+