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  1. #include <cstdio>    // for printf.
  2. #include <chrono>	// for milliseconds, steady_clcok, duration_cast.
  3.  
  4. const int N = 10 * 1000;
  5.  
  6. struct point
  7. {
  8. 	point(double x, double y)
  9. 		: x(x), y(y)
  10. 	{
  11. 	}
  12.  
  13. 	double x;
  14. 	double y;
  15. };
  16.  
  17. struct line
  18. {
  19. 	line(double x1, double y1, double x2, double y2)
  20. 		: p_p1(new point(x1, y1)), p_p2(new point(x2, y2))
  21. 	{
  22. 	}
  23.  
  24. 	~line() throw()
  25. 	{
  26. 		delete this->p_p2;
  27. 		delete this->p_p1;
  28. 	}
  29.  
  30. 	point *p_p1;
  31. 	point *p_p2;
  32. };
  33.  
  34. void f()
  35. {
  36. 	auto * * array1 = new line *[N];
  37.  
  38. 	auto st = std::chrono::steady_clock::now();
  39. 	for ( auto i = 0; i < N; i++ )
  40. 		array1[i] = new line(1, 2, 3, 4);
  41. 	for ( auto i = 0; i < N; i++ )
  42. 		delete array1[i];
  43. 	auto et = std::chrono::steady_clock::now();
  44. 	delete array1;
  45.  
  46. 	std::printf("total = %lld ms\n", std::chrono::duration_cast<std::chrono::milliseconds>(et - st).count());
  47. 	std::printf("avg. = %.1f us\n", std::chrono::duration_cast<std::chrono::milliseconds>(et - st).count() / static_cast<double>(N) * 1000);
  48. }
  49.  
  50. int main()
  51. {
  52. 	for ( auto i = 0; i < 3; i++ )
  53. 		f();
  54.  
  55. 	getchar();
  56. }
  57.  
  58. /*
  59. C#はこれ
  60.  
  61. using System;
  62.  
  63. static class Test
  64. {
  65. 	const int N = 100 * 1000;
  66.  
  67. 	class point
  68. 	{
  69. 		public point() { }
  70.  
  71. 		public point(double x, double y)
  72. 		{
  73. 			this.x = x;
  74. 			this.y = y;
  75. 		}
  76.  
  77. 		public double x;
  78. 		public double y;
  79. 	};
  80.  
  81. 	class line
  82. 	{
  83. 		public line(double x1, double y1, double x2, double y2)
  84. 		{
  85. 			this.p_p1.x = x1;
  86. 			this.p_p1.y = y1;
  87. 			this.p_p2.x = x2;
  88. 			this.p_p2.y = y2;
  89. 		}
  90.  
  91. 		public point p_p1 = new point();
  92. 		public point p_p2 = new point();
  93. 	};
  94.  
  95. 	static void f()
  96. 	{
  97. 		var array1 = new line[N];
  98.  
  99. 		var st = DateTime.Now;
  100. 		for ( var i = 0; i < N; i++ )
  101. 			array1[i] = new line(1, 2, 3, 4);
  102. 		array1 = null;
  103. 		System.GC.Collect(3, GCCollectionMode.Default, true);
  104. 		var et = DateTime.Now;
  105.  
  106. 		Console.WriteLine("total = {0:0.0} ms", (et - st).TotalMilliseconds);
  107. 		Console.WriteLine("avg. = {0:0.000} us", (et - st).TotalMilliseconds / (double)N * 1000);
  108. 	}
  109.  
  110. 	static void Main()
  111. 	{
  112. 		for ( var i = 0; i < 10; i++ )
  113. 			f();
  114.  
  115. 		Console.ReadKey();
  116. 	}
  117.  
  118. }
  119.  
  120. */
  121.  
Success #stdin #stdout 0.01s 3552KB
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stdin
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Standard input is empty
stdout
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total = 3 ms
avg. = 0.3 us
total = 2 ms
avg. = 0.2 us
total = 2 ms
avg. = 0.2 us
https://ideone.com/r56YkM
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
secret

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