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  1. #include <string>
  2. #include <iostream>
  3.  
  4. using namespace std;
  5.  
  6. class C1 {
  7. protected:
  8.     int i;
  9. public:
  10.     int getI() const { return i; }
  11.     void setI(int i_) { i = i_; }
  12. };
  13.  
  14. class C2 {
  15. protected:
  16.     string s;
  17. public:
  18.     string getS() const { return s; }
  19.     void setS(string s_) { s = s_; }
  20. };
  21.  
  22. class C3 {
  23. protected:
  24.     float f;
  25. public:
  26.     float getF() const { return f; }
  27.     void setF(float f_) { f = f_; }
  28. };
  29.  
  30. class C12 : public virtual C1, public virtual C2
  31. {
  32. };
  33.  
  34. class C23 : public virtual C2, public virtual C3
  35. {
  36. };
  37.  
  38. class C123 : public virtual C1, public virtual C12, public virtual C23
  39. {
  40. };
  41.  
  42.  
  43. void f1(C1& c1)
  44. {
  45.     cout << "f1:\n";
  46.     cout << "  getI: " << c1.getI() << endl;
  47. }
  48.  
  49. void f2(C12& c12)
  50. {
  51.     cout << "f2:\n";
  52.     cout << "  getI: " << c12.getI() << endl;
  53.     cout << "  getS: " << c12.getS() << endl;
  54. }
  55.  
  56. void f3(C23& c23)
  57. {
  58.     cout << "f3:\n";
  59.     cout << "  getS: " << c23.getS() << endl;
  60.     cout << "  getF: " << c23.getF() << endl;
  61. }
  62.  
  63. void test()
  64. {
  65.     C1 c1;
  66.     c1.setI(1);
  67.     f1(c1);
  68.  
  69.     cout << "\n===== " << endl;
  70.  
  71.     C12 c12;
  72.     c12.setI(12);
  73.     c12.setS("str12");
  74.     f1(c12);
  75.     f2(c12);
  76.  
  77.     cout << "\n===== " << endl;
  78.  
  79.     C123 c123;
  80.     c123.setI(123);
  81.     c123.setF(1.23f);
  82.     c123.setS("str123");
  83.     f1(c123);
  84.     f2(c123);
  85.     f3(c123);
  86.  
  87.     cout << "\n===== " << endl;
  88. }
  89.  
  90. int main()
  91. {
  92.     test();
  93. }
  94.  
Success #stdin #stdout 0s 15240KB
comments (?)
stdin
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Standard input is empty
stdout
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f1:
  getI: 1

===== 
f1:
  getI: 12
f2:
  getI: 12
  getS: str12

===== 
f1:
  getI: 123
f2:
  getI: 123
  getS: str123
f3:
  getS: str123
  getF: 1.23

=====
https://ideone.com/JpcNla
language:
C++ (gcc 8.3)
created:
8 years ago
visibility:
public

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