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  1. #include <string>
  2. #include <iostream>
  3.  
  4. struct Guy ;
  5.  
  6. struct Girl
  7. {
  8.     Girl( Guy* g = 0 ) : boyfriend(g) {}
  9.     Guy* boyfriend ;
  10. };
  11.  
  12. struct Guy
  13. {
  14.     Guy( const std::string& n ) : name(n) {}
  15.     const std::string name ;
  16.     // ...
  17. };
  18.  
  19. int main()
  20. {
  21.     Guy a( "a") ;
  22.  
  23.     Girl b( &a ) ;
  24.     if( b.boyfriend ) std::cout << b.boyfriend->name << '\n' ;
  25.  
  26.     Guy c( "c" ) ;
  27.     b.boyfriend = &c ;
  28.     if( b.boyfriend ) std::cout << b.boyfriend->name << '\n' ;
  29.  
  30.     b.boyfriend = 0 ;
  31.     if( b.boyfriend ) std::cout << b.boyfriend->name << '\n' ;
  32. }
  33.  
Success #stdin #stdout 0s 3028KB
comments (?)
stdin 
Standard input is empty
stdout 
a
c
https://ideone.com/cq9m0l
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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