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  1. #include <iostream>
  2. #include <algorithm>
  3. #include <cstring>
  4. #include <ctime>
  5. #define DIM 256
  6. #define LIMIT 1000000
  7.  
  8. using namespace std;
  9.  
  10. class Vector
  11. {
  12. private:
  13.   const int size;
  14.     int *array;
  15.  
  16. public:
  17. 	Vector(const int new_size) : size(new_size), array(new int [new_size]) {}
  18.  
  19. 	// copy constructor
  20. 	Vector(const Vector &rhs) : size(rhs.size)
  21. 	{
  22. 		// deep copy is required
  23. 		array = new int [rhs.size];
  24. 		memcpy(array, rhs.array, rhs.size * sizeof(int));
  25. 	}
  26.  
  27. 	int& operator[] (const int index)
  28. 	{
  29. 		return array[index];
  30. 	}
  31.  
  32. 	int operator[] (const int index) const
  33. 	{
  34. 		return array[index];
  35. 	}
  36.  
  37. 	Vector& operator+= (const Vector &rhs)
  38. 	{
  39. 		for(int index=0; index<size; ++index)
  40. 			array[index] += rhs[index];
  41. 		return *this;
  42. 	}
  43.  
  44. 	Vector operator+ (const Vector &rhs) const
  45. 	{
  46. 		Vector temp(*this);
  47. 		temp += rhs;
  48. 		return temp;
  49. 	}
  50.  
  51. 	~Vector() { delete [] array; }
  52. };
  53.  
  54. double runtime_without_move_semantic (const int iterative_limit)
  55. {
  56. 	clock_t begin, end;
  57. 	Vector a(DIM), b(DIM), c(DIM);
  58.  
  59. 	for(int i=0; i<DIM; ++i) {
  60. 		a[i] = 0;
  61. 		b[i] = 1;
  62. 		c[i] = 2;
  63. 	}
  64.  
  65. 	begin = clock();
  66.  
  67. 	for (int iter; iter<iterative_limit; ++iter) {
  68. 		Vector d = a+b+c;
  69. 		d[iter&DIM] = 2;
  70. 	}
  71.  
  72. 	end = clock();
  73.  
  74. 	return (static_cast<double>(end-begin) / static_cast<double>(CLOCKS_PER_SEC) );
  75. }
  76.  
  77. int main()
  78. {
  79. 	cout << runtime_without_move_semantic(LIMIT) << '\n';
  80. 	return 0;
  81. }
Success #stdin #stdout 1.17s 3028KB
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https://ideone.com/Z9KfyN
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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