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  1. #include <stdio.h>
  2.  
  3. struct Vector2
  4. {
  5.   float X, Y;
  6. };
  7.  
  8. struct Vector3
  9. {
  10.   float x, y, z;
  11. };
  12.  
  13. struct Space2
  14. {
  15.   typedef Vector2 Vector;
  16. };
  17.  
  18. struct Space3
  19. {
  20.   typedef Vector3 Vector;
  21. };
  22.  
  23. template<typename T>
  24. struct Overload{};
  25.  
  26. template<typename T>
  27. struct Printer
  28. {
  29.   void Print();
  30.   void Print(Overload<Space2>);
  31.   void Print(Overload<Space3>);
  32. };
  33.  
  34. template<typename Space>
  35. struct Body : Printer<Space>
  36. {
  37.   typedef typename Space::Vector vec;
  38.  
  39.   vec v;
  40. };
  41.  
  42. template<typename Space>
  43. void Printer<Space>::Print(Overload<Space2>)
  44. {
  45.   printf("%f", static_cast<Body<Space>*>(this)->v.X);
  46. }
  47.  
  48. template<typename Space>
  49. void Printer<Space>::Print(Overload<Space3>)
  50. {
  51.   printf("%f", static_cast<Body<Space>*>(this)->v.x);
  52. }
  53.  
  54. template<typename Space>
  55. void Printer<Space>::Print()
  56. {
  57.   Print(Overload<Space>());
  58. }
  59.  
  60. int main()
  61. {
  62.   Body<Space2> body;
  63.   body.Print();
  64.   return 0;
  65. };
  66.  
  67. template
  68. struct Body<Space2>;
Success #stdin #stdout 0s 3296KB
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Standard input is empty
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0.000000
https://ideone.com/UHvJ30
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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