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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. class Box {
  6.    double width;
  7.  
  8.    public:
  9.       friend void printWidth( Box box );
  10.       void setWidth( double wid );
  11. };
  12.  
  13. // Member function definition
  14. void Box::setWidth( double wid ) {
  15.    width = wid;
  16. }
  17.  
  18. // Note: printWidth() is not a member function of any class.
  19. void printWidth( Box box ) {
  20.    /* Because printWidth() is a friend of Box, it can
  21.    directly access any member of this class */
  22.    cout << "Width of box : " << box.width <<endl;
  23. }
  24.  
  25. // Main function for the program
  26. int main() {
  27.    Box box;
  28.  
  29.    // set box width without member function
  30.    box.setWidth(10.0);
  31.  
  32.    // Use friend function to print the wdith.
  33.    printWidth( box );
  34.  
  35.    return 0;
  36. }
Success #stdin #stdout 0.01s 5472KB
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stdin
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Standard input is empty
stdout
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Width of box : 10
https://ideone.com/sJzgCN
language:
C++14 (clang 8.0)
created:
1 year ago
visibility:
public

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