validator1.cc

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#include<iostream>

struct ficheLogin {
        std::string Nom;
        std::string Prenom;
        std::string Telephone;
        std::string Login;
};

struct Validator{
        virtual bool isValid(const std::string& t) const = 0;
        virtual void correctForm() const = 0;
};

struct registerLogin {
        const Validator &v;
        registerLogin(const Validator &v) : v(v) {}
        
        ficheLogin newLogin(){
                ficheLogin f;
                std::cout << "Nom:" << std::endl;
                std::cin >> f.Nom;
                std::cout << "Prénom:" << std::endl;
                std::cin >> f.Prenom;
                std::cout << "Telephone:" << std::endl;
                do{
                        v.correctForm();
                        std::cin >> f.Telephone;
                } while(!v.isValid(f.Telephone));
                std::cout << "Login:" << std::endl;
                std::cin >> f.Login;
                return f;
        }
};

struct StandardValidator : public Validator{
        bool isValid(const std::string& t) const{
                if(t.length()!=10)
                        return false;
                for(int i=0;i<10;i++)
                        if(t[i]<'0' || t[i]>'9')
                                return false;
                return true;
        }
        void correctForm() const{
                std::cout << "10 chiffres sans espace" << std::endl;
        }
        
        static const StandardValidator& getInstance(){
                static StandardValidator instance;
                return instance;
        }
        
        private:
                StandardValidator() {}
                StandardValidator(const StandardValidator&) {}
};

int main() {
        registerLogin r(StandardValidator::getInstance());
        ficheLogin f=r.newLogin();
}