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  1. import std.stdio,
  2.        std.range,
  3.        std.traits,
  4.        std.algorithm;
  5.  
  6. // static int idx; // 1, 2, 3, 4, 5, 6, 7 // OK
  7.  
  8. auto deepDup(A)(A arr)
  9. 	if (isArray!A)
  10. {
  11. 	static int idx; // 1, 1, 1, 2, 2, 3, 4 // Why is this happening?
  12. 	++idx;
  13. 	writeln("visited");
  14. 	static if (isArray!(ElementType!A)) {
  15. 		writeln("ifIdx = ", idx);
  16. 		writeln("ifArr = ", arr);
  17. 		return arr.map!(a => a.deepDup).array;
  18.  
  19. 	} else {
  20. 		writeln("elseIdx = ", idx);
  21. 		writeln("elseArr = ", arr);
  22. 		return arr.dup;
  23. 	}
  24. }
  25.  
  26. void main() {
  27.  
  28. 	auto a = [[[1, 2, 3], [4, 5, 6, 7, 8]],
  29. 		  [[9, 10], [11, 12, 13]]];
  30.  
  31. 	auto b = a.deepDup;
  32.  
  33. 	b[0][1][1 .. $ - 1] *= 3;
  34.  
  35. 	writeln("\nResualt: ");
  36.  
  37. 	writeln("a = ", a);
  38. 	// [[[1, 2, 3], [4, 5, 6, 7, 8]],
  39. 	//  [[9, 10], [11, 12, 13]]]
  40. 	writeln("b = ", b);
  41. 	// [[[1, 2, 3], [4, 15, 18, 21, 8]],
  42. 	//  [[9, 10], [11, 12, 13]]]
  43. }
Success #stdin #stdout 0s 4180KB
comments (?)
stdin
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Standard input is empty
stdout
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visited
ifIdx = 1
ifArr = [[[1, 2, 3], [4, 5, 6, 7, 8]], [[9, 10], [11, 12, 13]]]
visited
ifIdx = 1
ifArr = [[1, 2, 3], [4, 5, 6, 7, 8]]
visited
elseIdx = 1
elseArr = [1, 2, 3]
visited
elseIdx = 2
elseArr = [4, 5, 6, 7, 8]
visited
ifIdx = 2
ifArr = [[9, 10], [11, 12, 13]]
visited
elseIdx = 3
elseArr = [9, 10]
visited
elseIdx = 4
elseArr = [11, 12, 13]

Resualt: 
a = [[[1, 2, 3], [4, 5, 6, 7, 8]], [[9, 10], [11, 12, 13]]]
b = [[[1, 2, 3], [4, 15, 18, 21, 8]], [[9, 10], [11, 12, 13]]]
https://ideone.com/mAHZyO
language:
D (gdc 8.3)
created:
9 years ago
visibility:
public

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