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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. class my_bool {
  5. private:
  6.     bool value;
  7. public:
  8.     my_bool(bool value) : value(value) {}
  9.     operator bool() { return value; }
  10.  
  11.     friend my_bool operator==(const my_bool & instance_1, my_bool & instance_2);
  12. };
  13.  
  14. my_bool operator==(const my_bool & instance_1, my_bool & instance_2)
  15. {
  16.     return instance_1 == instance_2;
  17. }
  18.  
  19. int main()
  20. {
  21.     my_bool a = true;
  22.     bool b = true;
  23.     bool c = false;
  24.  
  25.     if (a == b)
  26.         cout << "a==b: true" << endl;
  27.     else
  28.         cout << "a==b: false " << endl;
  29.  
  30.     if (a == c)
  31.         cout << "a==c: true" << endl;
  32.     else
  33.         cout << "a==c: false " << endl;
  34.  
  35.     if (a)
  36.         cout << "a is: true" << endl;
  37.     else
  38.         cout << "a is: false " << endl;
  39. }
  40.  
Success #stdin #stdout 0s 3456KB
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stdin
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Standard input is empty
stdout
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a==b: true
a==c: false 
a is: true
https://ideone.com/30VfO1
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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