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  1. #include <iostream>
  2. #include <iomanip>
  3.  
  4. using namespace std;
  5.  
  6. template <class T1, class T2 = void>
  7. class A
  8. {
  9. public:
  10.  
  11.     void f()
  12.     {
  13.         t1 = t2.get();
  14.     }
  15.  
  16.     T1 result() {cout << "2\n"; return t1;}
  17. private:
  18.     T1 t1;
  19.     T2 t2;
  20. };
  21.  
  22. template<class T1> 
  23. class A<T1, void>
  24. {
  25. public:
  26.  
  27.     void f() {/*do nothing*/}
  28.     T1 result() { cout << "1\n"; return t1;}
  29.  
  30.     T1 t1;
  31. };
  32.  
  33. int main(int argc, char * argv[])
  34. {
  35.     A<int> a;
  36.     A<int,int> b;
  37.     a.result();
  38.     b.result();
  39. }
  40.  
Success #stdin #stdout 0.01s 5392KB
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https://ideone.com/UcyskQ
language:
C++14 (gcc 8.3)
created:
2 years ago
visibility:
secret

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