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  1. #include <assert.h>         // assert
  2. #include <string>           // std::string
  3. using namespace std;
  4.  
  5. struct Person
  6. {
  7.     string  name;
  8.  
  9.     void setValue( Person const& other )
  10.     {
  11.         name = other.name;
  12.     }
  13.  
  14.     void operator=( Person const& other ) { setValue( other ); }
  15.  
  16.     Person( string const& _name )
  17.         : name( _name )
  18.     {}
  19. };
  20.  
  21. struct Student
  22.     : Person
  23. {
  24.     int     studentId;
  25.  
  26.     void setValue( Student const& other )
  27.     {
  28.         Person::setValue( other );      // Copies the name part.
  29.         studentId = other.studentId;    // Copies the id part.
  30.     }
  31.  
  32.     void operator=( Student const& other ) { setValue( other ); }
  33.  
  34.     Student( string const& _name, int const _studentId )
  35.         : Person( _name ), studentId( _studentId )
  36.     {}
  37. };
  38.  
  39. int main()
  40. {
  41.     Person  a( "Hillary Clinton" );
  42.     Student b( "John Smith", 12345 );
  43.  
  44.     a = b;          // Only the Person::operator= matches the arguments.
  45.     // Here there is no `a.studentId`. The Student value has been SLICED.
  46.     // The executed operator=() function copies only the name attribute.
  47.  
  48.     assert( a.name == b.name );
  49. }
  50.  
Success #stdin #stdout 0.02s 2852KB
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https://ideone.com/hQENU
language:
C++ (gcc 8.3)
created:
14 years ago
visibility:
public

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