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  1. #include <iostream>
  2. #include <memory>
  3. #include <vector>
  4.  
  5. using namespace std;
  6.  
  7. template <size_t N, size_t... Sizes>
  8. struct total_extent {
  9. 	static constexpr size_t value = N * total_extent<Sizes...>::value;
  10. };
  11.  
  12. template <size_t N>
  13. struct total_extent<N> { static constexpr size_t value = N; };
  14.  
  15.  
  16. template <typename T, size_t... Sizes>
  17. struct CTensor
  18. {
  19. 	// embed data into structure rather than using pointer to heap
  20. 	T data[total_extent<Sizes...>::value];
  21. 	// can use here: std::array<T, total_extent<Sizes...>::value> data;
  22. };
  23.  
  24. template <typename T, size_t... Sizes>
  25. void pass_by_ref(CTensor<T, Sizes...> &tensor, const CTensor<T, Sizes...> &tensor2)
  26. {
  27. 	// to avoid copying pass by ref
  28. }
  29.  
  30. int main() {
  31. 	// should fit into stack
  32. 	CTensor<float, 3, 3, 3> stack_allocated;
  33.  
  34. 	// 64M floats better to allocate on heap
  35. 	auto heap_allocated = std::make_unique<CTensor<float, 256,256,256>>();
  36.  
  37. 	// and we still can embed it into other data structures
  38. 	std::vector<CTensor<float, 256, 256>> embedded_into_heap_allocated(2);
  39.  
  40. 	return 0;
  41. }
Success #stdin #stdout 0.07s 3264KB
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https://ideone.com/770bTa
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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