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  1. #include <iostream>
  2. #include <typeinfo>
  3.  
  4. using namespace std;
  5.  
  6. template<typename T1, typename T2>
  7. auto add(T1 l, T2 r) -> decltype(l + r){
  8.     return l + r;
  9. }
  10.  
  11. class C {};
  12.  
  13. class B {};
  14.  
  15. class A {
  16. public:
  17.     C operator+(const B& b) {
  18.         C c;
  19.         return c;
  20.     }
  21. };
  22.  
  23.  
  24. int main() {
  25.     // Using add()
  26.     A a;
  27.     B b;
  28.     auto c = add(a, b);
  29.  
  30.     cout << typeid(a).name() << endl;
  31.     cout << typeid(b).name() << endl;
  32.     cout << typeid(c).name() << endl;
  33.     cout << endl;
  34.  
  35.     // Doing the same thing but not on a function
  36.     A a2;
  37.     B b2;
  38.     auto c2 = a2 + b2;
  39.  
  40.     cout << typeid(a2).name() << endl;
  41.     cout << typeid(b2).name() << endl;
  42.     cout << typeid(c2).name() << endl;
  43. }
  44.  
Success #stdin #stdout 0s 2884KB
comments (?)
stdin 
Standard input is empty
stdout 
1A
1B
1C

1A
1B
1C
https://ideone.com/eDHI42
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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