fork download 
  1. #include <iostream>
  2. #include <tr1/functional>
  3.  
  4. class A {
  5. public:
  6.     virtual int foo(int p) {
  7.         std::cout << "A::foo(" << p << ")" << std::endl;
  8.         return 0;
  9.     }
  10. };
  11.  
  12. class B : public A {
  13. public:
  14.     virtual int foo(int p) {
  15.         std::cout << "B::foo(" << p << ")" << std::endl;
  16.         return 0;
  17.     }
  18. };
  19.  
  20. class C{
  21. };
  22.  
  23. class D : public C, public A{
  24. public:
  25.     virtual int foo(int p) {
  26.         std::cout << "D::foo(" << p << ")" << std::endl;
  27.         return 0;
  28.     }
  29. };
  30.  
  31. int foo(int x) {
  32.     std::cout << "foo(" << x << ")" << std::endl;
  33.     return 0;
  34. }
  35.  
  36. int main() {
  37.     using std::tr1::function;
  38.     using std::tr1::bind;
  39.     using std::tr1::placeholders::_1;
  40.  
  41.     A *a = new A;
  42.     A *b = new B;
  43.     A *d = new D;
  44.     function<int(int)> d1 = bind(&A::foo, a, _1);
  45.     function<int(int)> d2 = bind(&A::foo, b, _1);
  46.     function<int(int)> d3 = bind(&A::foo, d, _1);
  47.     function<int(int)> d4 = foo;
  48.     d1(100);
  49.     d2(100);
  50.     d3(100);
  51.     d4(100);
  52. }
  53.  
Success #stdin #stdout 0.01s 2860KB
comments (?)
stdin 
Standard input is empty
stdout 
A::foo(100)
B::foo(100)
D::foo(100)
foo(100)
https://ideone.com/QhIJH
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!