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  1. #include <iostream>
  2. #include <type_traits>
  3.  
  4. struct Foo {};
  5.  
  6. struct Bar {};
  7.  
  8. struct Baz : Foo, Bar
  9. {
  10. public:
  11.   virtual void something(const Bar &bar)
  12.   { std::cout << "Bar\n"; }
  13.  
  14.   template <class T, class = typename std::enable_if<std::is_convertible<const T&, const Foo&>::value && !std::is_convertible<const T&, const Bar&>::value>::type>
  15.   void something (const T &foo)
  16.   { something_impl(static_cast<const Foo&>(foo)); }
  17.  
  18. private:
  19.   virtual void something_impl(const Foo &foo)
  20.   { std::cout << "Foo\n"; }
  21.  
  22. };
  23.  
  24. int main()
  25. {
  26. 	Baz baz;
  27. 	baz.something(baz);
  28.  
  29. 	Foo foo;
  30. 	baz.something(foo);
  31.  
  32. 	Bar bar;
  33. 	baz.something(bar);
  34. }
Success #stdin #stdout 0s 3296KB
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stdin
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Standard input is empty
stdout
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Bar
Foo
Bar
https://ideone.com/EVOHAH
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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