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  1. /++
  2.  + Generic programming v2.0 in the style DR
  3. +/
  4.  
  5. auto ref findPos(T1, T2)(T1 required_element, T2 array) {
  6. 	import std.variant;
  7.  
  8. 	foreach (i, e; array)
  9. 	if (required_element == e) {
  10. 		return Variant(i);
  11. 	}
  12.  
  13. 	return Variant(-1);
  14. }
  15.  
  16. T foo(T)(uint idx, uint takeLazyN, T arr) {
  17. 	import std.range;
  18.  
  19. 	return arr[idx .. $].take(takeLazyN);
  20. }
  21.  
  22. void main() {
  23. 	import std.stdio, std.conv, std.range, std.algorithm, std.ascii, std.string, std.functional;
  24.  
  25. 	auto a = iota(0, 16).array;
  26. 	auto s = lowercase.array;
  27.  
  28. 	assert(equal(a, [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 ]));
  29. 	assert(equal(s, "abcdefghijklmnopqrstuvwxyz"));
  30.  
  31. 	auto tmpStart = findPos(3, a).toString;
  32.  
  33. 	alias checkFindFail = unaryFun!`a == "-1"`;
  34.  
  35. 	if (checkFindFail(tmpStart)) {
  36. 		writeln("Fuck!");
  37. 		return;
  38. 	}
  39.  
  40. 	auto start = tmpStart.to!uint;
  41. 	auto end = 10u;
  42.  
  43. 	writeln(foo(start, end, a));
  44.  
  45. 	tmpStart = findPos('d', s).toString;
  46.  
  47. 	if (checkFindFail(tmpStart)) {
  48. 		writeln("Fuck!");
  49. 		return;
  50. 	}
  51.  
  52. 	start = tmpStart.to!uint;
  53.  
  54. 	writeln(foo(start, end, s));
  55. }
Success #stdin #stdout 0s 3820KB
comments (?)
stdin
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Standard input is empty
stdout
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[3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
defghijklm
https://ideone.com/w3xpBS
language:
D (gdc 8.3)
created:
11 years ago
visibility:
public

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