gsanchez@greco.dit.upm.es (Gabriel Sanchez Gutierrez) (05/07/90)
/*-----*/ This is a little problem I have. I need a class Identif for asking to the objects by its own class. I use the Identif class for the questions about identification. Each class in the hierarchy defines his identifier like a const name[] . I want that in the call to base class in the constructer, the assignment will be produce. The hierarchy. Identif A / \ B C / | \ D E F The code is very simple and I think there is no problems in it. Only one thing: the virtual inheritance of father class. The main cause of this is to allow derived class to call the Identif constructor directly, with his own identifier. Well. This code, in one file (removing the includes, of course) runs well (or if I put the constructor in the .hpp file), but if I split it in various files this mechanism doesn`t work. Why??. -------------------------------------- // Version: g++ 1.36 // File: identif.hpp. #ifndef _Identif_H #pragma once #define _Identif_H 1 class Identif { const char *id; protected: Identif (const char *nom = "Noname"); public : const char* iden (void) const; void print_id (void) const; int The_same_class (const Identif& ii) const; }; #endif /*----------*/ // File: identif.cc #include <stream.h> #include "identif.hpp" Identif::Identif (const char *nom) : id(nom) { cout << "Constructor: " << id << "\n";} const char* Identif::iden (void) const {return id;}; void Identif::print_id (void) const { cout << " {Identify: " << id << "}\n";} int Identif::The_same_class (const Identif& ii) const { return (iden() == ii.iden());} /*----------*/ // File: father.hpp #ifndef _Father_H #pragma once #define _Father_H 1 #include "identif.hpp" class Father : public virtual Identif { public: Father (); virtual Father& operator = (const Father&); }; #endif /*---------*/ // File: father.cc #include <stream.h> #include "father.hpp" #include "identif.hpp" const char Father_class[] = "Father class"; Father::Father () : Identif(Father_class) { /* .. body ..*/ ;} Father& Father::operator = (const Father& p) { cout << "Father: operator =\n"; this->print_id(); p.print_id(); } /*---------*/ // File: test.cc #include "identif.hpp" #include "father.hpp" main() { Father p1,p2; p1=p2; }