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  1. #include <typeinfo>
  2. #include <typeindex>
  3. #include <unordered_map>
  4. #include <iostream>
  5.  
  6. using namespace std;
  7.  
  8. template <typename R>
  9. class MultiFuncObject {
  10.   unordered_map<type_index, void (*)()> m_funcs;
  11. public:
  12.  
  13.   MultiFuncObject<R> operator +=( R (* f)() ) {
  14.     m_funcs[typeid( R() )] = (void (*)()) f;
  15.     return *this;
  16.   }
  17.  
  18.   template <typename A1>
  19.   MultiFuncObject<R> operator +=( R (* f)(A1) ) {
  20.     m_funcs[typeid( R(A1) )] = (void (*)()) f;
  21.     return *this;
  22.   }
  23.  
  24.   template <typename A1, typename A2>
  25.   MultiFuncObject<R> operator +=( R (* f)(A1, A2) ) {
  26.     m_funcs[typeid( R(A1, A2) )] = (void (*)()) f;
  27.     return *this;
  28.   }
  29.  
  30.   template <typename A1, typename A2, typename A3>
  31.   MultiFuncObject<R> operator +=( R (* f)(A1, A2, A3) ) {
  32.     m_funcs[typeid( R(A1, A2, A3) )] = (void (*)()) f;
  33.     return *this;
  34.   }
  35.  
  36.   R operator()() const
  37.   {
  38.     unordered_map<type_index, void (*)()>::const_iterator it = m_funcs.find(typeid( R() ));
  39.     if (it != m_funcs.end()) {
  40.       R (*f)() = ( R (*)() )(it->second);
  41.       (*f)();
  42.     }
  43.   }
  44.  
  45.   template <typename A1>
  46.   R operator()(A1 a1) const
  47.   {
  48.     unordered_map<type_index, void (*)()>::const_iterator it = m_funcs.find(typeid( R(A1) ));
  49.     if (it != m_funcs.end()) {
  50.       R (*f)(A1) = ( R (*)(A1) )(it->second);
  51.       (*f)(a1);
  52.     }
  53.   }
  54.  
  55.   template <typename A1, typename A2>
  56.   R operator()(A1 a1, A2 a2) const
  57.   {
  58.     unordered_map<type_index, void (*)()>::const_iterator it = m_funcs.find(typeid( R(A1, A2) ));
  59.     if (it != m_funcs.end()) {
  60.       R (*f)(A1, A2) = ( R (*)(A1, A2) )(it->second);
  61.       (*f)(a1, a2);
  62.     }
  63.   }
  64.  
  65.   template <typename A1, typename A2, typename A3>
  66.   R operator()(A1 a1, A2 a2, A3 a3) const
  67.   {
  68.     unordered_map<type_index, void (*)()>::const_iterator it = m_funcs.find(typeid( R(A1, A2, A3) ));
  69.     if (it != m_funcs.end()) {
  70.       R (*f)(A1, A2, A3) = ( R (*)(A1, A2, A3) )(it->second);
  71.       (*f)(a1, a2, a3);
  72.     }
  73.   }
  74.  
  75. };
  76.  
  77. void _1() {
  78.   cout << "_1" << endl;
  79. }
  80.  
  81. void _2(char x) {
  82.   cout << "_2" << " " << x << endl;
  83. }
  84.  
  85. void _3(int x) {
  86.   cout << "_3" << " " << x << endl;
  87. }
  88.  
  89. void _4(double x) {
  90.   cout << "_4" << " " << x << endl;
  91. }
  92.  
  93. void _5(int a, int b) {
  94.   cout << "_5" << " " << a << " " << b << endl;
  95. }
  96.  
  97. void _6(char a, int b) {
  98.   cout << "_6" << " " << a << " " << b << endl;
  99. }
  100.  
  101. void _7(int a, int b, int c) {
  102.   cout << "_7" << " " << a << " " << b << " " << c << endl;
  103. }
  104.  
  105. int main() {
  106.   MultiFuncObject<void> funcs;
  107.   funcs += &_1;
  108.   funcs += &_2;
  109.   funcs += &_3;
  110.   funcs += &_4;
  111.   funcs += &_5;
  112.   funcs += &_6;
  113.   funcs += &_7;
  114.   funcs();
  115.   funcs('a');
  116.   funcs(56);
  117.   funcs(5.5);
  118.   funcs(2, 5);
  119.   funcs('q', 6);
  120.   funcs(1, 2, 3);
  121.   return 0;
  122. }
  123.  
  124.  
Success #stdin #stdout 0s 3464KB
comments (?)
stdin
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Standard input is empty
stdout
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_1
_2 a
_3 56
_4 5.5
_5 2 5
_6 q 6
_7 1 2 3
https://ideone.com/g2mdq4
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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