fork download
copy 
  1. #include <iostream>
  2. #include <vector>
  3. #include <memory>
  4.  
  5. struct Foo
  6. {
  7. 	std::vector<int> bars;
  8. 	std::vector<char> bazs;
  9. 	std::size_t size;
  10.  
  11. 	Foo(size_t size, int bar = 0, char baz = 0) :
  12. 		bars(size, bar), bazs(size, baz), size{size}
  13. 	{
  14. 	}
  15.  
  16. 	auto operator[](size_t n)
  17. 	{
  18. 		// if (n >= size) ...
  19. 		struct
  20. 		{
  21. 			int &bar;
  22. 			char &baz;
  23. 		} temp{ bars[n], bazs[n] };
  24. 		return temp;
  25. 	}
  26. };
  27.  
  28.  
  29. int main()
  30. {
  31. 	Foo arr(30, 100, 'a'); // 30 items
  32.  
  33. 	std::cout << arr[29].bar << std::endl;
  34. 	std::cout << arr[29].baz << std::endl;
  35.  
  36. 	std::cout << arr.bars[29] << std::endl;
  37. 	std::cout << arr.bazs[29] << std::endl;
  38.  
  39. 	std::unique_ptr<Foo> arr2 = std::make_unique<Foo>(25, 10, 'b'); // 25 items
  40.  
  41. 	std::cout << arr2->operator[](15).bar << std::endl;
  42. 	std::cout << arr2->operator[](15).baz << std::endl;
  43.  
  44. 	arr2->bars[15] = 11;
  45. 	std::cout << arr2->bars[15] << std::endl;
  46. 	arr2->bazs[15] = 'c';
  47. 	std::cout << arr2->bazs[15] << std::endl;
  48.  
  49. 	return 0;
  50. }
Success #stdin #stdout 0s 4412KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
100
a
100
a
10
b
11
c
https://ideone.com/TiVwOT
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!