Question

The code is written to implement a Bit class with some common functions.

#include <iostream>
#include <math.h>
using namespace std;

class Bit
{ 
    int width;
    int value;
    public:
        Bit(int v, int w)
        {
            value=v;
            width=w;
        }
        Bit(const Bit& b)
        {
            value= b.value;
            width= b.width;
        }
        int getWidth()
        {
            return width;
        }
        int getValue()
        {
            return value;
        }
        Bit plus(int newval)
        {
            value+=newval;
            if(value>=pow(2,width))
            cout<<"Overflow";
            return this;
        }
};

The error message is :

Conversion from 'Bit* const' to non-scalar type 'Bit' requested.

How can i remove the error?

Answer 1

this is a pointer, and your plus function declares that it returns a value.

You probably want to change the return type to void and not return anything; I can’t see a good reason to return a copy of the object.

Perhaps you want to return a reference in order to chain calls:

Bit & plus(int newval)        //< added &
{
    value+=newval;
    if(value>=pow(2,width))
        cout<<"Overflow";
    return *this;             //< added *
}

now you can write:

bit.plus(1).plus(3).plus(42);

if you really want to.