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  1. #include <iostream>
  2.  
  3. struct Function 
  4. {
  5.     virtual ~Function() {}
  6.     virtual void operator()() = 0;
  7. };
  8.  
  9. template <typename Class, typename ARG1>
  10. struct MemberFunction1 : public Function
  11. {
  12.     typedef void (Class::*MEM_FUNC)(ARG1);
  13.     explicit MemberFunction1(Class * obj, MEM_FUNC func, ARG1 arg1) :  m_object(obj), m_func(func), m_arg1(arg1) {}
  14.  
  15.     virtual void operator()()
  16.     {
  17.         (m_object->*m_func)(m_arg1);
  18.     }
  19.  
  20.     Class *  m_object;
  21.     MEM_FUNC m_func;    
  22.     ARG1     m_arg1;
  23. };
  24.  
  25. struct FunctionStorage
  26. {
  27.     explicit FunctionStorage(Function * func) : m_func(func) {}
  28.  
  29.     virtual ~FunctionStorage()
  30.     {
  31.         if (m_func)
  32.         {
  33.             delete m_func;
  34.             m_func = 0;
  35.         }
  36.     }
  37.  
  38.     void call() { (*m_func)(); }
  39.     Function * m_func;
  40. };
  41.  
  42. struct MemberFunction : public FunctionStorage
  43. {
  44.     template <typename Class, typename ARG1>
  45.     MemberFunction(Class * obj, void (Class::*func)(ARG1), ARG1 arg1) : FunctionStorage(new MemberFunction1<Class, ARG1>(obj, func, arg1)) {}
  46. };
  47.  
  48.  
  49. class Foo 
  50. {
  51. public:
  52.     void funcWithParam(int value)
  53.     {
  54.         std::cout << "foo::funcWithParam(" << value << ")\n";
  55.     }
  56.     void funcWithParam(const char * msg)
  57.     {
  58.         std::cout << "foo::funcWithParam(" << msg << ")\n";
  59.     }
  60. };
  61.  
  62. int main()
  63. {
  64.     Foo f;    
  65.     MemberFunction(&f, &Foo::funcWithParam, 5).call();
  66.     MemberFunction(&f, &Foo::funcWithParam, "hello").call();
  67.     return 0;
  68. }
  69.  
Success #stdin #stdout 0.01s 2860KB
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stdin
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Standard input is empty
stdout
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foo::funcWithParam(5)
foo::funcWithParam(hello)
https://ideone.com/ECi7e
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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