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  1. #include <boost/optional.hpp>
  2. #include <boost/bind.hpp>
  3. #include <boost/preprocessor/slot/counter.hpp>
  4. #include <iostream>
  5. #include <ostream>
  6. using namespace std;
  7.  
  8. template<unsigned ID,typename Functor>
  9. boost::optional<Functor> &get_local()
  10. {
  11.     static boost::optional<Functor> local;
  12.     return local;
  13. }
  14.  
  15. template<unsigned ID,typename Functor>
  16. typename Functor::result_type wrapper()
  17. {
  18.     return get_local<ID,Functor>().get()();
  19. }
  20.  
  21. template<typename ReturnType>
  22. struct Func
  23. {
  24.     typedef ReturnType (*type)();
  25. };
  26.  
  27. template<unsigned ID,typename Functor>
  28. typename Func<typename Functor::result_type>::type get_wrapper(Functor f)
  29. {
  30.     (get_local<ID,Functor>()) = f;
  31.     return wrapper<ID,Functor>;
  32. }
  33.  
  34. // ----------------------------------------------------------------------
  35.  
  36. void test(void (*fptr)())
  37. {
  38.     fptr();
  39. }
  40.  
  41. struct SomeStruct
  42. {
  43.     int data;
  44.     void some_method()
  45.     {
  46.         cout << data << endl;
  47.     }
  48.     void another_method()
  49.     {
  50.         cout << -data << endl;
  51.     }
  52. };
  53.  
  54. int main()
  55. {
  56.     SomeStruct local[] = { {11}, {22}, {33} };
  57.  
  58. #include BOOST_PP_UPDATE_COUNTER()
  59.     test(get_wrapper<BOOST_PP_COUNTER>(  boost::bind(&SomeStruct::some_method,local[0]) ));
  60. #include BOOST_PP_UPDATE_COUNTER()
  61.     test(get_wrapper<BOOST_PP_COUNTER>(  boost::bind(&SomeStruct::another_method,local[0]) ));
  62.  
  63. #include BOOST_PP_UPDATE_COUNTER()
  64.     test(get_wrapper<BOOST_PP_COUNTER>(  boost::bind(&SomeStruct::some_method,local[1]) ));
  65. #include BOOST_PP_UPDATE_COUNTER()
  66.     test(get_wrapper<BOOST_PP_COUNTER>(  boost::bind(&SomeStruct::another_method,local[1]) ));
  67.  
  68. #include BOOST_PP_UPDATE_COUNTER()
  69.     test(get_wrapper<BOOST_PP_COUNTER>(  boost::bind(&SomeStruct::some_method,local[2]) ));
  70. #include BOOST_PP_UPDATE_COUNTER()
  71.     test(get_wrapper<BOOST_PP_COUNTER>(  boost::bind(&SomeStruct::another_method,local[2]) ));
  72.  
  73. #include BOOST_PP_UPDATE_COUNTER()
  74.     std::cout<<BOOST_PP_COUNTER<<std::endl;
  75. #include BOOST_PP_UPDATE_COUNTER()
  76.     std::cout<<BOOST_PP_COUNTER<<std::endl;
  77. #include BOOST_PP_UPDATE_COUNTER()
  78.     std::cout<<BOOST_PP_COUNTER<<std::endl;
  79. }
  80.  
Success #stdin #stdout 0.01s 2684KB
comments (?)
stdin
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Standard input is empty
stdout
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11
-11
22
-22
33
-33
7
8
9
https://ideone.com/Fg6B1I
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

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