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Differences between the pastes #134206 (05.05.2020 14:41) and #148066 (10.10.2020 03:27).
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#include
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class type_one

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{

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};

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class type_two

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{

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};

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class i_one

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{

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public:

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  virtual void set (const type_one & val, int id) = 0;

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};

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class i_two

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{

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public:

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  virtual void set (const type_two & val) = 0;

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};

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class i_one_two:public i_one, public i_two

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{

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// = = = = = = >>> Вот решение

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//public:

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//    virtual void set (const type_one & val, int id) = 0;

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//    virtual void set (const type_two & val) = 0;

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};

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class OneTwo:public i_one_two

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{

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public:

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  void set (const type_one & val, int id)

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  {

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    std::cout << "type_one value, id = " << id;

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  }

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  void set (const type_two & val)

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  {

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    std::cout << "type_two value\n";

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  }

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};

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int

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main ()

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{

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  OneTwo ot;

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  i_one_two *i12 = &ot;

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  i12->set(type_one (), 111); // error: request for member ‘set’ is ambiguous

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  i12->set(type_two ());      // error: request for member ‘set’ is ambiguous

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  return 0;

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}

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//==============================

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main.cpp: In function ‘int main()’:

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main.cpp:52:8: error: request for member ‘set’ is ambiguous

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   i12->set(type_one (), 111);

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        ^~~

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main.cpp:20:16: note: candidates are: virtual void i_two::set(const type_two&)

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   virtual void set (const type_two & val) = 0;

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                ^~~

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main.cpp:14:16: note:                 virtual void i_one::set(const type_one&, int)

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   virtual void set (const type_one & val, int id) = 0;

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                ^~~

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main.cpp:53:8: error: request for member ‘set’ is ambiguous

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   i12->set(type_two ());

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        ^~~

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main.cpp:20:16: note: candidates are: virtual void i_two::set(const type_two&)

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   virtual void set (const type_two & val) = 0;

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                ^~~

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main.cpp:14:16: note:                 virtual void i_one::set(const type_one&, int)

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   virtual void set (const type_one & val, int id) = 0;

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                ^~~

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