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  1. #include <iostream>
  2. #include <functional>
  3.  
  4. template<typename F, typename C>
  5. auto smart_bind(F f, C* c)
  6. {
  7.   return [c, f](auto&&... args) { return (c->*f)(std::forward<decltype(args)>(args)...); };
  8. }
  9.  
  10. struct Foo
  11. {
  12.   int bar(int i, float f, bool b)
  13.   {
  14.     return b ? i : f;
  15.   }
  16.   double sum(double x, double y)
  17.   {
  18.     return x + y;
  19.   }
  20.   void print(int x)
  21.   {
  22.     std::cout << x << std::endl;
  23.   }
  24. };
  25.  
  26. int main()
  27. {
  28.   Foo object;
  29.   std::function<int(int, float, bool)> f1 = smart_bind(&Foo::bar, &object);
  30.   std::function<double(double, double)> f2 = smart_bind(&Foo::sum, &object);
  31.   std::function<void(int)> f3 = smart_bind(&Foo::print, &object);
  32.  
  33.   std::cout << f1(100, 150.32, true) << std::endl;
  34.   std::cout << f2(1.0, 2.0) << std::endl;
  35.   f3(42);
  36. }
  37.  
Success #stdin #stdout 0s 4484KB
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stdin
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Standard input is empty
stdout
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100
3
42
https://ideone.com/deR4fy
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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