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  1. #include <iostream>
  2. #include <type_traits>
  3.  
  4. class Numeric {
  5.  public:
  6.   bool isNumeric() {
  7.    return true;
  8.   }
  9. };
  10.  
  11. class String {
  12. };
  13.  
  14. template<class T>
  15. class Myclass {
  16.  private:
  17.   T temp;
  18.  public:
  19.   template<typename U = T, typename std::enable_if<std::is_same<U, Numeric>::value, std::size_t>::type = 0>
  20.   void checkNumeric() {
  21.    std::cout << "is numeric = " << temp.isNumeric() << std::endl;
  22.   }
  23.  
  24.   template<typename U = T, typename std::enable_if<!std::is_same<U, Numeric>::value, std::size_t>::type = 0>
  25.   void checkNumeric() {
  26.    std::cout << "is numeric = false" << std::endl;
  27.   }
  28. };
  29.  
  30. int main() {
  31.  Myclass<Numeric> a;
  32.  a.checkNumeric();
  33.  Myclass<String> b;
  34.  b.checkNumeric();
  35. }
Success #stdin #stdout 0s 3296KB
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Standard input is empty
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is numeric = 1
is numeric = false
https://ideone.com/DCARps
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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