#include <iostream>
	#include <memory>
 
	struct Obj {
		int a;
		int b;
	};
 
	std::unique_ptr<int[]>
	fn(Obj* os, size_t N, int Obj::*member)
	{
		auto arr = std::make_unique<int[]>(N);
		for (size_t i = 0; i < N; ++i) {
			arr[i] = os[i].*member;
		}
		return arr;
	}
 
	int main() {
		Obj os[] { { 1, 10 }, { 2, 20 } };
 
		auto a1 = fn(os, 2, &Obj::a);
		auto a2 = fn(os, 2, &Obj::b);
 
		for (size_t i = 0; i < 2; ++i) {
			std::cout << i << ": " << a1[i] << ", " << a2[i] << '\n';
		}
	}

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