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  1.  
  2. #include <QtCore/QCoreApplication>
  3. #include <QtCore/QElapsedTimer>
  4. #include <QtGui/QVector3D>
  5. #include <iostream>
  6. #include <sstream>
  7. #define OP_LOOPS 1000000
  8. #define RETRY_LOOPS 10
  9.  
  10. int main(int argc, char *argv[])
  11. {
  12. #ifdef _DEBUG
  13.   std::cout << "DEBUG" << std::endl << std::endl;
  14. #else
  15.   std::cout << "RELEASE" << std::endl << std::endl;
  16. #endif
  17.  
  18.   using Ints = std::list<int>;
  19.   std::list<int> ints;
  20.   for (unsigned int i = 0; i < OP_LOOPS; ++i) {
  21.     ints.push_back(i);
  22.   }
  23.  
  24.   std::cout << "Number of list elements: " << OP_LOOPS << std::endl << std::endl;
  25.  
  26.   struct Times {
  27.     qint64 t0, t1, t2, t3, tx;
  28.   };
  29.  
  30.   std::vector<Times> elapsedTimes;
  31.   elapsedTimes.resize(RETRY_LOOPS);
  32.  
  33.   for (unsigned int r = 0; r < RETRY_LOOPS; ++r) {
  34.  
  35.     {
  36.       QElapsedTimer timer;
  37.       timer.start();
  38.  
  39.       for (Ints::iterator itr = ints.begin(); itr != ints.end(); itr++) {
  40.         (*itr) -= 1;
  41.       }
  42.  
  43.       qint64 elapsed = timer.elapsed();
  44.       elapsedTimes[r].t0 = elapsed;
  45.     }
  46.  
  47.     {
  48.       QElapsedTimer timer;
  49.       timer.start();
  50.  
  51.       for (Ints::iterator itr = ints.begin(); itr != ints.end(); ++itr) {
  52.         (*itr) -= 1;
  53.       }
  54.  
  55.       qint64 elapsed = timer.elapsed();
  56.       elapsedTimes[r].t1 = elapsed;
  57.     }
  58.  
  59.     {
  60.       QElapsedTimer timer;
  61.       timer.start();
  62.  
  63.       for (Ints::iterator itr = ints.begin(), end = ints.end(); itr != end; ++itr) {
  64.         (*itr) -= 1;
  65.       }
  66.  
  67.       qint64 elapsed = timer.elapsed();
  68.       elapsedTimes[r].t2 = elapsed;
  69.     }
  70.  
  71.     {
  72.       QElapsedTimer timer;
  73.       timer.start();
  74.  
  75.       for (int& i : ints) {
  76.         i -= 1;
  77.       }
  78.  
  79.       qint64 elapsed = timer.elapsed();
  80.       elapsedTimes[r].t3 = elapsed;
  81.     }
  82.  
  83.     {
  84.       QElapsedTimer timer;
  85.       timer.start();
  86.  
  87.       Ints::iterator itr = ints.begin();
  88.       while (itr != ints.end()) {
  89.         (*itr) -= 1;
  90.         ++itr;
  91.       }
  92.  
  93.       qint64 elapsed = timer.elapsed();
  94.       elapsedTimes[r].tx = elapsed;
  95.     }
  96.  
  97.     std::cout << ".";
  98.   }
  99.  
  100.   std::cout << std::endl << std::endl << "times [ms]";
  101.   std::cout << std::endl  << "for_loop_post_inc__:";
  102.   float d = 0.0;
  103.   for (unsigned int r = 0; r < RETRY_LOOPS; ++r) {
  104.     d += (float)elapsedTimes[r].t0;
  105.     std::cout << " " << elapsedTimes[r].t0;    
  106.   }
  107.   std::cout << " -> " << (d / (float)RETRY_LOOPS);
  108.  
  109.   d = 0.0;
  110.   std::cout << std::endl << "for_loop_pre_inc_____:";
  111.   for (unsigned int r = 0; r < RETRY_LOOPS; ++r) {
  112.     d += (float)elapsedTimes[r].t1;
  113.     std::cout << " " << elapsedTimes[r].t1;
  114.   }
  115.   std::cout << " -> " << (d / (float)RETRY_LOOPS);
  116.  
  117.   d = 0.0;
  118.   std::cout << std::endl << "for_loop_pre_inc_cond:";
  119.   for (unsigned int r = 0; r < RETRY_LOOPS; ++r) {
  120.     d += (float)elapsedTimes[r].t2;
  121.     std::cout << " " << elapsedTimes[r].t2;
  122.   }
  123.   std::cout << " -> " << (d / (float)RETRY_LOOPS);
  124.  
  125.   d = 0.0;
  126.   std::cout << std::endl << "for_each_____________:";
  127.   for (unsigned int r = 0; r < RETRY_LOOPS; ++r) {
  128.     d += (float)elapsedTimes[r].t3;
  129.     std::cout << " " << elapsedTimes[r].t3;
  130.   }
  131.   std::cout << " -> " << (d / (float)RETRY_LOOPS);
  132.  
  133.   d = 0.0;
  134.   std::cout << std::endl << "while_loop___________:";
  135.   for (unsigned int r = 0; r < RETRY_LOOPS; ++r) {
  136.     d += (float)elapsedTimes[r].tx;
  137.     std::cout << " " << elapsedTimes[r].tx;
  138.   }
  139.   std::cout << " -> " << (d / (float)RETRY_LOOPS);
  140.  
  141.  
  142.   std::cout << std::endl << std::endl;
  143.  
  144.   return 0;
  145. }
  146.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
prog.cpp:2:35: fatal error: QtCore/QCoreApplication: No such file or directory
compilation terminated.
stdout
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Standard output is empty
https://ideone.com/4w4R32
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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