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  1. #include <iostream>
  2. #include <memory>
  3.  
  4. struct LoggerInterface {}; 
  5.  
  6. std::shared_ptr<LoggerInterface> pi = std::make_shared<LoggerInterface>(); 
  7.  
  8. struct B {
  9. 	virtual void foo(int blablabla, std::shared_ptr<LoggerInterface> logger = nullptr) = 0;
  10. };
  11. struct D : B {
  12.     void foo(int blablabla, std::shared_ptr<LoggerInterface> logger) override {
  13.     	std::cout << "foo: "<<blablabla<<" "<< logger<<std::endl; 
  14.     }
  15. };
  16.  
  17. struct E : B {
  18.     void foo(int blablabla, std::shared_ptr<LoggerInterface> logger = pi) override {
  19.     	std::cout << "foo: "<<blablabla<<" "<< logger<<std::endl; 
  20.     }
  21. };
  22.  
  23. int main() {
  24. 	D d; 
  25. 	B *b=&d;
  26. 	b->foo(15); 
  27. 	//d.foo(15);
  28. 	E e; 
  29.  
  30. 	e.foo(16); 
  31. 	B *b2 = &e; 
  32. 	b2->foo(16);
  33.  
  34. 	return 0;
  35. }
Success #stdin #stdout 0s 3472KB
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stdin
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Standard input is empty
stdout
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foo: 15 0
foo: 16 0x8d97a1c
foo: 16 0
https://ideone.com/Ksjhvi
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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