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  1. #include <iostream>
  2.  
  3. template<class T, T> struct proxy;
  4.  
  5. template <typename T, typename R, typename... Args, R(T::*mf)(Args...)>
  6. struct proxy<R(T::*)(Args...), mf>
  7. {
  8.     proxy(T& host) : m_Host(host) {}
  9.  
  10.     template <typename... CArgs>
  11.     R call(CArgs&&... args)
  12.     {
  13.         std::cout << __PRETTY_FUNCTION__ << '\n';
  14.         return (m_Host.*mf)(std::forward<CArgs>(args)...);
  15.     }
  16.  
  17. private:
  18.     proxy& operator=(const proxy&);
  19.     T& m_Host;
  20. };
  21.  
  22. class SomeHost
  23. {
  24. public:
  25.     int SomeGetter()
  26.     {
  27.         std::cout << __PRETTY_FUNCTION__ << '\n';
  28.         return 42;
  29.     }
  30.  
  31.     void SomeSetter(int var)
  32.     {
  33.         std::cout << __PRETTY_FUNCTION__ << '\n';
  34.         m_Var = var;
  35.     }
  36.  
  37. private:
  38.     int m_Var;
  39. };
  40.  
  41. void test()
  42. {
  43.     SomeHost obj;
  44.     proxy<void(SomeHost::*)(int), &SomeHost::SomeSetter> g(obj);
  45.     g.call(5);
  46.  
  47.     proxy<int(SomeHost::*)(), &SomeHost::SomeGetter> f(obj);
  48.     f.call();
  49. }
  50.  
  51. int main()
  52. {
  53.     test();
  54.     return 0;
  55. }
  56.  
Success #stdin #stdout 0s 3296KB
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R proxy<R (T::*)(Args ...), mf>::call(CArgs&& ...) [with CArgs = {int}; T = SomeHost; R = void; Args = {int}; R (T::* mf)(Args ...) = &SomeHost::SomeSetter]
void SomeHost::SomeSetter(int)
R proxy<R (T::*)(Args ...), mf>::call(CArgs&& ...) [with CArgs = {}; T = SomeHost; R = int; Args = {}; R (T::* mf)(Args ...) = &SomeHost::SomeGetter]
int SomeHost::SomeGetter()
https://ideone.com/rCCuUO
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
secret

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