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  1.     template<class T, class R = void>  
  2.     struct enable_if_type
  3.     {
  4.         typedef R type;
  5.     };
  6.  
  7.     template<class E, class Enable = void>
  8.     struct GetFloatType
  9.     {
  10.         typedef E type;
  11.     };
  12.  
  13.     template<class E>
  14.     struct GetFloatType<E, typename enable_if_type<typename E::Scalar>::type>
  15.     {
  16.         typedef typename E::Scalar type;
  17.     };
  18.  
  19.  
  20.     template <class Elemtype, class Floattype = typename GetFloatType<Elemtype>::type>
  21.     class ExponentialSmoother
  22.     {
  23.         // ...
  24.     };
  25.  
  26.     template<typename T>
  27.     class Vector
  28.     {
  29.         public:
  30.         typedef T Scalar;
  31.     };
  32.  
  33.     template<typename T>
  34.     class Vector2
  35.     {
  36.     };
  37.  
  38. int main()
  39. {
  40.     ExponentialSmoother<Vector<float> > a;
  41. 	ExponentialSmoother<Vector2<float> > b;
  42. 	ExponentialSmoother<double> c;
  43. }
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https://ideone.com/BCyK3f
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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