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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. template <class T, typename comp>
  5. struct klasa {
  6.     klasa(const T &a, const T &b, comp C = greater<T>()) 
  7.     {
  8.         cout << C(a, b) << endl;
  9.     }
  10. };
  11.  
  12. struct MyCompare
  13. {
  14.     bool operator()(const int& a, const int& b) { return true; }
  15. };
  16.  
  17. bool fPtr(const int& a, const int& b) { return false; }
  18.  
  19. int main() 
  20. {
  21.     klasa<int, greater<int>> a(1, 2);
  22.     klasa<int, MyCompare> b(5, 2, MyCompare());
  23.  
  24.     auto lessThan = [](const int& a, const int& b) { return a < b; };
  25.     klasa<int, decltype(lessThan)> c(1, 5, lessThan);
  26.  
  27.     klasa<int, decltype(fPtr)> d(0, 0, fPtr);
  28.  
  29.     return 0;
  30. }
Success #stdin #stdout 0s 3096KB
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https://ideone.com/FKN1dt
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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