Add a logger to np_trapping and use it to write the execution time

src/trapping/np_trapping.cpp

@@ -2,9 +2,14 @@
  *
  * \brief Trapping problem handler.
  */
+#include <chrono>
 #include <cstdio>
 #include <string>
 
+#ifndef INCLUDE_LOGGING_H_
+#include "../include/logging.h"
+#endif
+
 using namespace std;
 
 extern void frfme(string data_file, string output_path);
@@ -17,9 +22,13 @@ extern void lffft(string data_file, string output_path);
  * \return result: `int`
  */
 int main(int argc, char **argv) {
+  chrono::time_point<chrono::high_resolution_clock> t_start = chrono::high_resolution_clock::now();
+  chrono::duration<double> elapsed;
   string frfme_data_file = "../../test_data/trapping/DFRFME";
   string lffft_data_file = "../../test_data/trapping/DLFFFT";
   string output_path = ".";
+  string message;
+  Logger logger(LOG_DEBG);
   if (argc == 4) {
     frfme_data_file = string(argv[1]);
     lffft_data_file = string(argv[2]);
@@ -27,5 +36,8 @@ int main(int argc, char **argv) {
   }
   frfme(frfme_data_file, output_path);
   lffft(lffft_data_file, output_path);
+  elapsed = chrono::high_resolution_clock::now() - t_start;
+  message = "INFO: calculation lasted " + to_string(elapsed.count()) + "s.\n";
+  logger.log(message);
   return 0;
 }