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  1. import std.stdio;
  2.  
  3. class Collection( Item )
  4. {
  5.     void add( Item item ) { }
  6. 	void addRange( Item[] items )
  7. 	{
  8. 		foreach( item ; items ) add( item );
  9. 	}
  10. 	void say( Message )( Message message )
  11. 	{
  12. 		writeln( "Collection says: " , message );
  13. 	}
  14. }
  15.  
  16. class CollectionWithCounter( Item , CollectionInner = Collection!Item )
  17. {
  18. 	private CollectionInner inner;
  19. 	alias inner this;
  20.  
  21. 	private int count;
  22.  
  23.     this( CollectionInner inner = new CollectionInner )
  24. 	{
  25. 		this.inner = inner;
  26. 	}
  27.  
  28. 	void add( Item item )
  29. 	{
  30. 		inner.add( item );
  31. 		count += 1;
  32. 	}
  33.  
  34. 	void addRange( Item[] items )
  35. 	{
  36. 		inner.addRange( items );
  37. 		count += items.length;
  38. 	}
  39. }
  40.  
  41. void main()
  42. {
  43.     auto foo = new CollectionWithCounter!int;
  44.  
  45. 	foo.add(1);
  46. 	foo.add(2);
  47. 	foo.add(3);
  48.  
  49. 	foo.addRange([ 1 , 2 , 3 ]);
  50.  
  51. 	foo.say( foo.count );
  52. }
  53.  
Success #stdin #stdout 0.01s 13944KB
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stdin
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Standard input is empty
stdout
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Collection says: 6
https://ideone.com/B5rgw7
language:
D (ldc 1.12.0)
created:
7 years ago
visibility:
public

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