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  1. #include <iostream>
  2. #include <vector>
  3. #include <utility>
  4.  
  5. template <typename Container, typename ValueGetter, typename SizeType, typename T1, typename T2>
  6. void Count(Container& c, ValueGetter valueGetter, T1&& t1, SizeType& out1, T2&& t2, SizeType& out2)
  7. {
  8. 	using GetVal = decltype(valueGetter(c[0]));
  9. 	static_assert(std::is_same<std::decay_t<T1>, GetVal>::value, "Types don't match!");
  10. 	static_assert(std::is_same<std::decay_t<T2>, GetVal>::value, "Types don't match!");
  11.  
  12. 	for (auto& elm : c)
  13. 	{
  14. 		const auto& val = valueGetter(elm);
  15. 		if (val == t1) ++out1;
  16. 		else if (val == t2) ++out2;
  17. 	}
  18. }
  19.  
  20. struct Foo
  21. {
  22. 	int GetI() { return i; }
  23. 	int i = 0;
  24. };
  25.  
  26. int main()
  27. {
  28. 	std::vector<Foo> f(10);
  29. 	f[0].i = f[3].i = f[7].i = 37;
  30. 	f[1].i = 1;
  31.  
  32. 	unsigned i0 = 0;
  33. 	unsigned i37 = 0;
  34.  
  35. 	Count(f, [](auto& f) { return f.GetI(); }, 
  36. 				0, i0,
  37. 				37, i37);
  38.  
  39. 	std::cout << i0 << " " << i37;
  40. }
Success #stdin #stdout 0s 3468KB
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https://ideone.com/AkddbC
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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