Examples

Example: An implementation of += for strings. When concatenating strings, it is useful to know the length in advance so as to allocate memory only once.

String& String::operator+=( const String& rhs ) {





 // … implementation …





 return *this;


}





String operator+( const String& lhs, const String& rhs ) {


 String temp;                                 // initially empty


 temp.Reserve( lhs.size() + rhs.size() );     // allocate enough memory


 return (temp += lhs) += rhs;                 // append the strings and return


}