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  1. #include <iostream>
  2. #include <functional>
  3. using namespace std;
  4.  
  5. class A {
  6. protected:
  7.     virtual int get() {
  8.         cout << "in A::get" << endl;
  9.         return 0;
  10.     }
  11. public:
  12.     template<typename Function>
  13.     A(const Function & get_ptr) {
  14.         get_ptr();  // NOT get() !
  15.     }
  16. };
  17.  
  18. class B : public A {
  19. protected:
  20.     int get() override {
  21.         cout << "in B::get" << endl;
  22.         return 0;
  23.     }
  24. public:
  25.     B() : A([=]{ B::get(); })
  26.     //           ^^^^^^^^  this is undefined behavior, as `this` is not yet a B*!
  27.     {
  28.     }
  29. };
  30.  
  31. int main() {
  32. 	B b;
  33. 	return 0;
  34. }
Success #stdin #stdout 0s 3296KB
comments (?)
stdin
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Standard input is empty
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in B::get
https://ideone.com/sF3411
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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