fork download
copy 
  1. 	#include <iostream>
  2. 	#include <memory>
  3.  
  4. 	struct Obj {
  5. 		int a;
  6. 		int b;
  7. 	};
  8.  
  9. 	std::unique_ptr<int[]>
  10. 	fn(Obj* os, size_t N, std::function<int(const Obj&)> keyFn)
  11. 	{
  12. 		auto arr = std::make_unique<int[]>(N);
  13. 		for (size_t i = 0; i < N; ++i) {
  14. 			arr[i] = keyFn(os[i]);
  15. 		}
  16. 		return arr;
  17. 	}
  18.  
  19. 	int main() {
  20. 		Obj os[] { { 1, 10 }, { 2, 20 } };
  21.  
  22. 		auto a1 = fn(os, 2, [](const Obj& o){ return o.a; });
  23. 		auto a2 = fn(os, 2, [](const Obj& o){ return o.b; });
  24.  
  25. 		for (size_t i = 0; i < 2; ++i) {
  26. 			std::cout << i << ": " << a1[i] << ", " << a2[i] << '\n';
  27. 		}
  28. 	}
Success #stdin #stdout 0s 3456KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
0: 1, 10
1: 2, 20
https://ideone.com/9OvTzl
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!