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  1. #include <type_traits>
  2.  
  3. namespace foo {
  4.     struct Vector {
  5.         double x, y, z;
  6.  
  7.         Vector(double x, double y, double z) :
  8.             x{x}, y{y}, z{z}
  9.         {}
  10.  
  11.         template<class T>
  12.         Vector(const T& foreign) :
  13.             x{foreign.x}, y{foreign.y}, z{foreign.z}
  14.         {}
  15.  
  16.  
  17.         template<class T
  18.                  ,
  19.                  class = typename std::enable_if<
  20.                      std::is_constructible<T, double,double,double>::value
  21.                      >::type
  22.                  >
  23.         operator T() const
  24.         {
  25.             return T{x, y, z};
  26.         }
  27.     };
  28.  
  29.  
  30.     Vector makeAVector()
  31.     {
  32.         return {1, 2, 3};
  33.     }
  34. }
  35.  
  36.  
  37. namespace bar {
  38.  
  39.     struct Vector3 {
  40.         using Scalar = double;
  41.  
  42.         Scalar x, y, z;
  43.  
  44.         Vector3(Scalar x, Scalar y, Scalar z) :
  45.             x{x}, y{y}, z{z}
  46.         {}
  47.  
  48.         Vector3(const Vector3& other) :
  49.             x{other.x}, y{other.y}, z{other.z}
  50.         {}
  51.  
  52.         Vector3(const Scalar *ptr) :
  53.             x{ptr[0]}, y{ptr[1]}, z{ptr[2]}
  54.         {}
  55.  
  56.     };
  57.  
  58.     void doSomething(const Vector3& v, double* x)
  59.     {}
  60.  
  61.     void doSomething(const Vector3& v, const Vector3&  x)
  62.     {}
  63.  
  64. }
  65.  
  66.  
  67. int main()
  68. {
  69.     bar::Vector3 a{2, 3, 4};
  70.  
  71.     bar::doSomething( a, foo::makeAVector() );
  72. }
  73.  
Success #stdin #stdout 0s 3292KB
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https://ideone.com/nWdmJh
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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