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  1.  
  2. import std.stdio;
  3. import std.perf;
  4.  
  5. /++
  6.  + - 配列のスライシング
  7.  + forによる繰り返しより、かなり高速
  8.  +/
  9.  
  10. void main()
  11. {
  12. // erapsed time = 0(secs)/ 26(millis)/25578(micros)
  13. // erapsed time = 0(secs)/ 7(millis)/7519(micros)
  14.  
  15. 	uint[81] s =
  16. 	[
  17. 		1, 2, 3, 4, 5, 6, 7, 8, 9,
  18. 		2, 4, 6, 8,10,12,14,16,18,
  19. 		3, 6, 9,12,15,18,21,24,27,
  20. 		4, 8,12,16,20,24,28,32,36,
  21. 		5,10,15,20,25,30,35,40,45,
  22. 		6,12,18,24,30,36,42,48,54,
  23. 		7,14,21,28,35,42,49,56,63,
  24. 		8,16,24,32,40,48,56,64,72,
  25. 		9,18,27,36,45,54,63,72,81,
  26. 	];
  27. 	uint[81] d;
  28.  
  29. 	auto sw = new PerformanceCounter;
  30.  
  31. 	// 測定スタート
  32. 	sw.start();
  33. 	for (int i; i < 100000; i++)
  34. 	{
  35. 		// do something
  36. 		d[0 .. s.length] = s[0 .. $];
  37. 	}
  38. 	// 測定ストップ
  39. 	sw.stop();
  40. 	writefln("erapsed time = %d(secs)/ %d(millis)/%d(micros)",
  41. 		sw.seconds(), sw.milliseconds(), sw.microseconds());
  42.  
  43. 	// 測定スタート
  44. 	sw.start();
  45. 	for (int i; i < 100000; i++)
  46. 	{
  47. 		// do something
  48. 		for (int j; j < 81; j++)
  49. 			d[j] = s[j];
  50. 	}
  51. 	// 測定ストップ
  52. 	sw.stop();
  53. 	writefln("erapsed time = %d(secs)/ %d(millis)/%d(micros)",
  54. 		sw.seconds(), sw.milliseconds(), sw.microseconds());
  55.  
  56. }
  57.  
Success #stdin #stdout 0.05s 2120KB
comments (?)
stdin 
Standard input is empty
stdout 
erapsed time = 0(secs)/ 7(millis)/7257(micros)
erapsed time = 0(secs)/ 26(millis)/26163(micros)
https://ideone.com/kLMmT
language:
D (dmd 2.085.0)
created:
14 years ago
visibility:
public

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