push_back() method of C++ Vector is (probably) causing strange error

Question

Hi !

Here is my code: https://code.sololearn.com/cm4K03Hu3YC7/#cpp

In my code, I've defined a class Test which has only one member named `num`. It also has two constructors. But, when I tried to create an array of Test objects using C++ Vectors, it gave me the following error:

"error: binding 'const Test' to reference of type 'Test&' discards qualifiers"

And, to be honest with you, the error statement went over my head. Could someone please help me?

EDIT: this code is basically a minimal verifiable version of my project

Answer 1

Test(const Test& t): num(t.num){
//cpy-ctor

}

copy constructor is a class member by default, it has access to private members. ;)

Answer 2

Test(const Test& t)....
Push_back calls copy constructor and its implementation wants const

Answer 3

@AZTECCO, yes that's what I'd tried. But, the problem is I'm making a project in which I have private members instead of public ones and there I've deployed "getters" and "setters".

For example: https://code.sololearn.com/cg1lUu29iIP4/#cpp (modified)
Sorry, for the incomplete code.

So, now I've a different error here, which I suppose is due to the "setters" on const object. Is it so?

Answer 4

rv7 @Learn_on_the_Web you should add const modifier for getters to be able use it on const objects.

https://code.sololearn.com/c7q6izCv01fi/?ref=app