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  1. #include <iostream>
  2. #include <string>
  3. #include <complex>
  4. #include <type_traits>
  5.  
  6. template <class T>
  7. struct is_complex : std::false_type {};
  8.  
  9. template <class T>
  10. struct is_complex<std::complex<T>> : std::true_type {};
  11.  
  12. template<class T>
  13. class cc {
  14.     public:
  15.  
  16.     template <class TT = T>
  17.     typename std::enable_if<!is_complex<TT>::value>::type foo() {
  18.         std::cout << "default " << v << std::endl ;
  19.     }
  20.  
  21.     template <class TT = T> 
  22.     typename std::enable_if<is_complex<TT>::value>::type foo() {
  23.         std::cout << "complex t " << v << std::endl ;
  24.     }
  25.  
  26.     T v ;
  27. };
  28.  
  29. int main()
  30. {
  31.   cc< std::complex<double> > r ;
  32.   cc<double> r2 ;
  33.  
  34.   r.foo() ;
  35.   r2.foo() ;
  36. }
Success #stdin #stdout 0s 16064KB
comments (?)
stdin 
Standard input is empty
stdout 
complex t (0,0)
default 0
https://ideone.com/rDxtaT
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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