void C::role( int r ) {\fbox{}
require( r == PERSON || r == STUDENT ); _role = r; if (roles[ role] == 0) { switch (r) { case PERSON : roles[ role] = new P(); break; case STUDENT : roles[ role] = new S(); break; }; } }
void C::role( int r ) {\fbox{}
require( r == PERSON || r == STUDENT ); _role = r; if (roles[ role] == 0) { switch (r) { case PERSON : roles[ role] = new P(); break; case STUDENT : roles[ role] = new S(); break; }; } }