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  1. #include <iostream>
  2. #include <algorithm>
  3. #include <chrono>
  4. #include <thread>
  5. #include <vector>
  6.  
  7. using namespace std;
  8.  
  9. #define ITERATIONS 2000
  10.  
  11. #define MEASURE( func )												\
  12. 	{																\
  13. 		chrono::system_clock::time_point a, b;						\
  14. 		this_thread::sleep_for( chrono::milliseconds( 2000 ) );		\
  15. 		a = chrono::system_clock::now();							\
  16. 		for ( unsigned i = 0; i < ITERATIONS; i++ ) {				\
  17. 			for ( unsigned j = 0; j < ITERATIONS; j++ ) {			\
  18. 				func();												\
  19. 			}														\
  20. 		}															\
  21. 		b = chrono::system_clock::now();							\
  22. 		cout << #func << " \t: " << chrono::duration_cast< chrono::milliseconds >( b - a ).count() << " ms." << endl;	\
  23. 	}
  24.  
  25.  
  26. void test_qsort() {
  27. 	int myints[] = { 32, 71, 12, 45, 26, 80, 53, 33 };
  28. 	qsort( myints, sizeof( myints ) / sizeof( myints[0] ), sizeof( int ), []( const void * a, const void * b ){ return ( *(int *)a - *(int *)b ); } );
  29. }
  30.  
  31. void test_std_sort() {
  32. 	int myints[] = { 32, 71, 12, 45, 26, 80, 53, 33 };
  33. 	vector <int> myvector( myints, myints + 8 );
  34. 	sort( myvector.begin(), myvector.end() );
  35. }
  36.  
  37. int main()
  38. {
  39. 	MEASURE( test_std_sort );
  40. 	MEASURE( test_qsort );
  41. 	return 0;
  42. }
  43.  
Success #stdin #stdout 2.22s 3432KB
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Standard input is empty
stdout
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test_std_sort 	: 540 ms.
test_qsort 	: 1680 ms.
https://ideone.com/YI9X1H
Not a good example...
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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