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  1.     #include <memory>
  2.  
  3.     struct Listener {};
  4.     struct TCP : public Listener {};
  5.     struct Domain : public Listener {};
  6.     struct A {};
  7.     struct Branch : public TCP, public A {};
  8.     struct DIAMOND : public TCP, public Domain {};
  9.  
  10.     int main() {
  11.         std::unique_ptr<Listener> ptr;
  12.         ptr.reset(new TCP);
  13.         ptr.reset(new Domain);
  14.         ptr.reset(new Branch);
  15.         ptr.reset(new DIAMOND);
  16.     }
  17.  
Compilation error #stdin compilation error #stdout 0s 3268KB
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stdin
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Standard input is empty
compilation info 
prog.cpp: In function 'int main()':
prog.cpp:15:30: error: 'Listener' is an ambiguous base of 'DIAMOND'
         ptr.reset(new DIAMOND);
                              ^
stdout
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Standard output is empty
https://ideone.com/prjXeL
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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