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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. class A;
  6.  
  7. class Base {
  8.  public:
  9.   Base(A* a, int k);
  10.   void call();
  11.   void call2();
  12.  
  13.  private:
  14.   A* a;
  15.   int k;
  16. };
  17.  
  18. class A : public Base {
  19.   friend class Base;
  20.  public:
  21.   A() : Base(this, 5) {}
  22.  
  23.   Base lol(int k) { return Base(this, k); }
  24.  
  25.   using Base::call;
  26.   using Base::call2;
  27.  
  28.  private:
  29.   void call(int k) { cout << "call(" << k << ");\n"; }
  30.   void call2(int k) { cout << "call2(" << k*2 << ");\n"; }
  31. };
  32.  
  33. Base::Base(A* a, int k) : a(a), k(k) {}
  34. void Base::call() {
  35.     a->call(k);
  36. }
  37. void Base::call2() {
  38.     a->call2(k);
  39. }
  40.  
  41. int main() {
  42.     A a;
  43.     Base x = a.lol(3);
  44.     a.call();
  45.     x.call2();
  46.     return 0;
  47. }
Success #stdin #stdout 0s 2896KB
comments (?)
stdin
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Standard input is empty
stdout
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call(5);
call2(6);
https://ideone.com/YocOUz
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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