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  1. #include <iostream>
  2. #include <functional> // C++11
  3. //#include <boost/function.hpp>
  4. //#include <boost/bind.hpp>
  5.  
  6. struct A{
  7.   std::function<void(int)> callback;
  8.   void invoke(){ callback(42); }
  9. };
  10.  
  11. struct B{
  12.   void foo(int data){ std::cout << data * 2 << "\n"; }
  13. };
  14.  
  15. struct C{
  16.   void bar(int data){ std::cout << data / 2 << "\n"; }
  17. };
  18.  
  19. int main(){
  20.   using namespace std::placeholders; // namespace for argument placeholders for std::bind
  21.                                      // not needed for Boost.Bind
  22.   A a;
  23.   B b;
  24.   a.callback = std::bind(&B::foo, &b, _1);
  25.   a.invoke();
  26.   C c;
  27.   a.callback = std::bind(&C::bar, &c, _1);
  28.   a.invoke();
  29. };
Success #stdin #stdout 0s 3020KB
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https://ideone.com/gKkmh
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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