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  1. #include <iostream>
  2. #include <memory>
  3.  
  4. struct foo_t {
  5. 	foo_t() = delete;
  6. 	foo_t(const foo_t&) = delete;
  7. 	foo_t(int, float, const std::string& /*... whatever*/) {}
  8. };
  9.  
  10. struct C {
  11. 	C(double, char /*... whatever constructor arguments*/)
  12. 	: foo(nullptr) {
  13. 		// lenghty computations allowing to define a, b and c
  14. 		int a   = 0 /* ? */;
  15. 		float b = 0 /* ? */;
  16. 		std::string s /* ? */;
  17. 		foo.reset(new foo_t(a,b,s));
  18. 		// remaining computations...
  19. 	}
  20.  
  21. 	std::unique_ptr<foo_t> foo;
  22. };
  23.  
  24. // translate that into ->
  25.  
  26. std::tuple<int, float, std::string> precompute(double, char) {
  27. 		// lenghty computations allowing to define a, b and c
  28. 		int a   = 0 /* ? */;
  29. 		float b = 0 /* ? */;
  30. 		std::string s /* ? */;
  31. 		return {a, b, std::move(s)};
  32. }
  33.  
  34. struct C2 {
  35. 	C2(double d, char c /*... whatever constructor arguments*/)
  36. 	: C2(d, c, precompute(d, c)) {}
  37.  
  38. 	C2(double, char, std::tuple<int, float, std::string>&& tpl)
  39. 	: foo(std::get<0>(tpl), std::get<1>(tpl), std::get<2>(tpl)) {
  40. 		// remaining computations...
  41. 	}
  42.  
  43. 	foo_t foo;
  44. };
  45.  
  46.  
  47. int main() {
  48. 	// your code goes here
  49. 	return 0;
  50. }
Success #stdin #stdout 0s 4524KB
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https://ideone.com/ubbbb7
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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