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  1. #include <iostream>
  2. #include <type_traits>
  3.  
  4. class C
  5. {
  6. private:
  7.     class integral {};
  8.     class floatingpoint {};
  9.     class cstring {};
  10.  
  11.     template<bool sw, typename T1, typename T2>
  12.     using Sel = typename std::conditional<sw, T1, T2>::type;
  13.  
  14.     template<typename T>
  15.     using Sel2 = Sel<std::is_convertible<T, char const*>::value, cstring, void>;
  16.     template<typename T>
  17.     using Sel1 = Sel<std::is_floating_point<T>::value, floatingpoint, Sel2<T>>;
  18.     template<typename T>
  19.     using SelectOverload = Sel<std::is_integral<T>::value, integral, Sel1<T>>;
  20.  
  21. public:
  22.     template<typename T, typename Overload = SelectOverload<T>>
  23.     explicit C(T&& value)
  24.     {
  25.         init(std::forward<T>(value), Overload());
  26.     }
  27.  
  28. private:    
  29.     template<typename T>
  30.     void init(T&& value, integral)
  31.     {
  32.         std::cout << "integral" << std::endl;
  33.     }
  34.  
  35.     template<typename T>
  36.     void init(T&& value, floatingpoint)
  37.     {
  38.         std::cout << "floating point" << std::endl;
  39.     }
  40.  
  41.     template<typename T>
  42.     void init(T&& value, cstring)
  43.     {
  44.         std::cout << "cstring" << std::endl;
  45.     }
  46. };
  47.  
  48. int main()
  49. {
  50.     C z(0);
  51.     C a(1);
  52.     C b(1.0);
  53.     C c("");
  54. }
  55.  
Success #stdin #stdout 0s 3296KB
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stdin
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Standard input is empty
stdout
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integral
integral
floating point
cstring
https://ideone.com/oDOSLH
int/float constructors 3
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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