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  1.  
  2. #include <iostream>
  3.  
  4. struct Client
  5. {
  6.     template<class Request, class Response>
  7.     void sendRequest(const Request& q , Response& a)
  8.     {
  9.         std::cout << q << " " << a << "\n";
  10.     }
  11. };
  12.  
  13. template<class Q, class A, class ... Rest>
  14. struct IClient : public virtual IClient<Rest ...>
  15. {
  16.     using IClient<Rest ...>::sendRequest;
  17.     virtual void sendRequest(const Q& , A&) = 0;
  18.  
  19.     ~IClient() = default;
  20. };
  21.  
  22. template<class Q, class A>
  23. struct IClient<Q, A>
  24. {
  25.     virtual void sendRequest(const Q& , A&) = 0;
  26.     ~IClient() = default;
  27. };
  28.  
  29. void foo(IClient<int, char, int, int, double, float>& client)
  30. {
  31.     int i = 10;
  32.     char c = 'd';
  33.     double d = 3.14;
  34.     float f = 100.5f;
  35.     client.sendRequest(i, c);
  36.     client.sendRequest(i, i);
  37.     client.sendRequest(d, f);
  38. }
  39.  
  40. template<class Q, class A, class ... Rest>
  41. struct ClientAdapter: public virtual IClient<Q, A, Rest ...>, public ClientAdapter<Rest ...>
  42. {
  43.     using ClientAdapter<Rest ...>::sendRequest;
  44.  
  45.     Client& client;
  46.     ClientAdapter(Client& c) : ClientAdapter<Rest...>(c), client(c)
  47.     {
  48.  
  49.     }
  50.  
  51.     void sendRequest(const Q& q, A& a) override
  52.     {
  53.         client.sendRequest(q, a);
  54.     }
  55.  
  56.     ~ClientAdapter() = default;
  57. };
  58.  
  59. template<class Q, class A>
  60. struct ClientAdapter<Q, A> : public virtual IClient<Q, A>
  61. {
  62.     Client& client;
  63.     ClientAdapter(Client& c) : client(c) { }
  64.  
  65.     void sendRequest(const Q& q, A& a) override
  66.     {
  67.         client.sendRequest(q, a);
  68.     }
  69.  
  70.     ~ClientAdapter() = default;
  71. };
  72.  
  73. int main()
  74. {
  75.     Client client;
  76.     ClientAdapter<int, char, int, int, double, float> adapter(client);
  77.     foo(adapter);
  78. }
  79.  
Success #stdin #stdout 0s 16064KB
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Standard input is empty
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10 d
10 10
3.14 100.5
https://ideone.com/rrl6Sj
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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