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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. class B { public: int x; };
  5. class A: public B {};
  6.  
  7. void foo(const B& b)
  8. {
  9.     cout << "Hello world: " << b.x << endl; 
  10. }
  11.  
  12. int main() 
  13. {
  14.     A a;
  15.     a.x = 30;
  16.  
  17.     foo(a);
  18. }
Success #stdin #stdout 0s 16064KB
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stdin
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Standard input is empty
stdout
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Hello world: 30
https://ideone.com/gLsKrd
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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