1//===================================================== 2// File : STL_Timer.hh 3// Author : L. Plagne <laurent.plagne@edf.fr)> 4// Copyright (C) EDF R&D, mar déc 3 18:59:35 CET 2002 5//===================================================== 6// 7// This program is free software; you can redistribute it and/or 8// modify it under the terms of the GNU General Public License 9// as published by the Free Software Foundation; either version 2 10// of the License, or (at your option) any later version. 11// 12// This program is distributed in the hope that it will be useful, 13// but WITHOUT ANY WARRANTY; without even the implied warranty of 14// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15// GNU General Public License for more details. 16// You should have received a copy of the GNU General Public License 17// along with this program; if not, write to the Free Software 18// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 19// 20// STL Timer Class. Adapted (L.P.) from the timer class by Musser et Al 21// described int the Book : STL Tutorial and reference guide. 22// Define a timer class for analyzing algorithm performance. 23#include <iostream> 24#include <iomanip> 25#include <vector> 26#include <map> 27#include <algorithm> 28using namespace std; 29 30class STL_Timer { 31public: 32 STL_Timer(){ baseline = false; }; // Default constructor 33 // Start a series of r trials: 34 void start(unsigned int r){ 35 reps = r; 36 count = 0; 37 iterations.clear(); 38 iterations.reserve(reps); 39 initial = time(0); 40 }; 41 // Start a series of r trials to determine baseline time: 42 void start_baseline(unsigned int r) 43 { 44 baseline = true; 45 start(r); 46 } 47 // Returns true if the trials have been completed, else false 48 bool check() 49 { 50 ++count; 51 final = time(0); 52 if (initial < final) { 53 iterations.push_back(count); 54 initial = final; 55 count = 0; 56 } 57 return (iterations.size() < reps); 58 }; 59 // Returns the results for external use 60 double get_time( void ) 61 { 62 sort(iterations.begin(), iterations.end()); 63 return 1.0/iterations[reps/2]; 64 }; 65private: 66 unsigned int reps; // Number of trials 67 // For storing loop iterations of a trial 68 vector<long> iterations; 69 // For saving initial and final times of a trial 70 time_t initial, final; 71 // For counting loop iterations of a trial 72 unsigned long count; 73 // true if this is a baseline computation, false otherwise 74 bool baseline; 75 // For recording the baseline time 76 double baseline_time; 77}; 78 79