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  1. #include <boost/shared_ptr.hpp>
  2. #include <algorithm>
  3. #include <iostream>
  4. #include <typeinfo>
  5. #include <ostream>
  6. #include <vector>
  7.  
  8. using namespace std;
  9. using namespace boost;
  10.  
  11. typedef int KeyEvent;
  12. typedef void (*func_type)(const KeyEvent &);
  13.  
  14. struct AbstractCallback
  15. {
  16.     virtual void operator()(const KeyEvent &p)=0;
  17.     virtual bool compare_to(const std::type_info &rhs_type,const void *rhs) const=0;
  18.     virtual bool compare_to(const std::type_info &rhs_type,const func_type *rhs) const=0;
  19.     virtual bool equals(const AbstractCallback &rhs) const=0;
  20. };
  21.  
  22. template<typename Callback>
  23. struct ConcreteCallback : AbstractCallback
  24. {
  25.     Callback callback;
  26.     ConcreteCallback(Callback p_callback) : callback(p_callback) {}
  27.     void operator()(const KeyEvent &p)
  28.     {
  29.         callback(p);
  30.     }
  31.     bool compare_to(const std::type_info &rhs_type,const void *rhs) const
  32.     {
  33.         return (typeid(Callback)==rhs_type) &&
  34.             ( *static_cast<const Callback*>(rhs) == callback );
  35.     }
  36.     bool compare_to(const std::type_info &rhs_type,const func_type *rhs) const
  37.     {
  38.         return false;
  39.     }
  40.     bool equals(const AbstractCallback &rhs) const
  41.     {
  42.         return rhs.compare_to(typeid(Callback),&callback);
  43.     }
  44. };
  45.  
  46. template<>
  47. struct ConcreteCallback<func_type> : AbstractCallback
  48. {
  49.     func_type callback;
  50.     ConcreteCallback(func_type p_callback) : callback(p_callback) {}
  51.     void operator()(const KeyEvent &p)
  52.     {
  53.         callback(p);
  54.     }
  55.     bool compare_to(const std::type_info &rhs_type,const void *rhs) const
  56.     {
  57.         return false;
  58.     }
  59.     bool compare_to(const std::type_info &rhs_type,const func_type *rhs) const
  60.     {
  61.         return *rhs == callback;
  62.     }
  63.     bool equals(const AbstractCallback &rhs) const
  64.     {
  65.         return rhs.compare_to(typeid(func_type),&callback);
  66.     }
  67. };
  68.  
  69.  
  70. struct KeyCallback
  71. {
  72.     shared_ptr<AbstractCallback> func;
  73. public:
  74.     template<typename Func>
  75.     KeyCallback(Func f) : func(new ConcreteCallback<Func>(f)) {}
  76.     friend bool operator==(const KeyCallback &lhs,const KeyCallback &rhs)
  77.     {
  78.         return lhs.func->equals(*rhs.func);
  79.     }
  80.     void operator()(const KeyEvent &p)
  81.     {
  82.         (*func)(p);
  83.     }
  84. };
  85.  
  86. void func1(const KeyEvent &)
  87. {
  88.     cout << "func1" << endl;
  89. }
  90.  
  91. void func3(const KeyEvent &)
  92. {
  93.     cout << "func3" << endl;
  94. }
  95.  
  96. class func2
  97. {
  98.     int data;
  99. public:
  100.     func2(int n) : data(n) {}
  101.     friend bool operator==(const func2 &lhs,const func2 &rhs)
  102.     {
  103.         return lhs.data==rhs.data;
  104.     }
  105.     void operator()(const KeyEvent &)
  106.     {
  107.         cout << "func2, data=" << data << endl;
  108.     }
  109. };
  110.  
  111. struct Caller
  112. {
  113.     template<typename F>
  114.     void operator()(F f)
  115.     {
  116.         f(1);
  117.     }
  118. };
  119.  
  120. int main(int argc,char *argv[])
  121. {
  122.     vector<KeyCallback> v;
  123.  
  124.     v.push_back(KeyCallback(func1));
  125.     v.push_back(KeyCallback(func1));
  126.     v.push_back(KeyCallback(func1));
  127.  
  128.     v.push_back(KeyCallback(func2(1)));
  129.     v.push_back(KeyCallback(func2(1)));
  130.  
  131.     v.push_back(KeyCallback(func2(2)));
  132.     v.push_back(KeyCallback(func2(2)));
  133.     v.push_back(KeyCallback(func2(2)));
  134.     v.push_back(KeyCallback(func2(2)));
  135.  
  136.     v.push_back(KeyCallback(func3));
  137.  
  138.     for_each(v.begin(),v.end(),Caller());
  139.  
  140.     cout << count(v.begin(),v.end(),KeyCallback(func1)) << endl;
  141.     cout << count(v.begin(),v.end(),KeyCallback(func2(1))) << endl;
  142.     cout << count(v.begin(),v.end(),KeyCallback(func2(2))) << endl;
  143.     cout << count(v.begin(),v.end(),KeyCallback(func3)) << endl;
  144.     return 0;
  145. }
Success #stdin #stdout 0.01s 2868KB
comments (?)
stdin
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Standard input is empty
stdout
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func1
func1
func1
func2, data=1
func2, data=1
func2, data=2
func2, data=2
func2, data=2
func2, data=2
func3
3
2
4
1
https://ideone.com/CpJJXX
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
secret

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