二元运算符重载 class 和常量 c++

Question

I am trying to do operator overloading

My header is:

class Nyble

{
public:

Nyble();
Nyble(const Nyble& n);
Nyble& operator=(const Nyble& n);
~Nyble();
Nyble operator+(const char a);
Nyble operator-(const char a);
Nyble operator+(Nyble& n1);
Nyble operator+();
unsigned char getData();

private:
    // Do not change this data
unsigned char data;

}

Source:

#include "Nyble.h"

unsigned char Nyble::getData()
{
    return this->data;

}

Nyble Nyble::operator+(const char val)
{   
    return  Nyble(getData()+val);
}

Nyble Nyble::operator-(const char value)
{
    return Nyble(value + getData()) ;
}``

I am getting error saying no suitable constructor exist to convert int to Nyble.if so what constructor should i declare.Else what changes should i make to the overloading function?

Answer 1

You need to add a constructor for Nyble(getData() + val); and Nyble(value + getData()) to work:

class Nyble {
public:
    explicit Nyble(char d);       // add this
    // ...
};

Nyble::Nyble(char d) : data(d) {} // and the implementation