Add a Timer example script

examples/CMakeLists.txt

@@ -22,3 +22,6 @@ target_link_libraries(icp_advance_api pointmatcher)
 
 add_executable(icp_customized icp_customized.cpp)
 target_link_libraries(icp_customized pointmatcher)
+
+add_executable(timer timer.cpp)
+target_link_libraries(timer pointmatcher)

examples/timer.cpp

@@ -0,0 +1,25 @@
+#include "pointmatcher/Timer.h"
+#include <iostream>
+#include <chrono>
+#include <thread>
+
+namespace Time {
+    using Clock = std::chrono::high_resolution_clock;
+    using TimePoint = std::chrono::time_point<Clock>;
+}
+
+int main() {
+    const Time::TimePoint time1 = Time::Clock::now();
+    PointMatcherSupport::timer t1;
+
+    std::this_thread::sleep_for(std::chrono::seconds(10));
+
+    const Time::TimePoint time2 = Time::Clock::now();
+    const double elapsed = t1.elapsed();
+
+    std::cout << "PM:timer time = " << elapsed << "\nchrono duration = "
+              << std::chrono::duration_cast<std::chrono::nanoseconds>(time2 - time1).count() / double(1000000000)
+              << " ms" << std::endl;
+
+    return 0;
+}