Nrthugu

im new to c++ and getting the error on my project that represents a resturant:

error: use of deleted function ‘Dish& Dish::operator=(const Dish&)’

        *__result = *__first;



In file included from /users/studs/bsc/2019/romid/CLionProjects/rest/src/../include/Customer.h:9:0,

                from /users/studs/bsc/2019/romid/CLionProjects/rest/src/../include/Action.h:9,

                from /users/studs/bsc/2019/romid/CLionProjects/rest/src/Action.cpp:1:

/users/studs/bsc/2019/romid/CLionProjects/rest/src/../include/Dish.h:19:7: note: ‘Dish& Dish::operator=(const Dish&)’ is implicitly deleted because the default definition would be ill-formed:

class Dish{

      ^~~~

i cant understand which class cause the problem or what is the problem .
this is part the dish.cpp class.

 #include "../include/Dish.h";

#include <iostream>



Dish::Dish(int d_id, std::string d_name, int d_price, DishType d_type) : 

id(d_id), name(d_name)

price(d_price), type(d_type){}



int Dish::getId() const

 {

    return id;

}



std::string Dish::getName() const {return name;}



int Dish::getPrice() const {return price;}



DishType Dish::getType() const {return type;}

this is the dish.h header file :

#ifndef DISH_H_

#define DISH_H_



#include <string>



enum DishType{

    VEG, SPC, BVG, ALC

};



class Dish{

public:

    Dish(int d_id, std::string d_name, int d_price, DishType d_type);

    int getId() const;

    std::string getName() const;

    int getPrice() const;

    DishType getType() const;

private:

    const int id;

    const std::string name;

    const int price;

    const DishType type;

};





#endif

The class Dish contains constant members like const int id;. Therefore there will be no usable automatically defined assignment operator, because assigning one Dish to another one would require their ids to be assigned as well, but of course const does not allow changing the value.

Therefore you are not allowed to use assignment of one Dish to another until you provide a user-defined assignment operator.

In particular thinks like

Dish a(...);

Dish b(...);

b = a;

will trigger the error. You are doing something like that somewhere in your code.

As the members of Dish are const the compiler is not able to automatically generate an assignment operator as it can't change the members of an existing object.

You could try to write your own assignment operator but you would run into the same issue. You either need to make the members non-const or stop calling the assignment operator.