Operator Overloading

[poisonseaurchin]

I keep getting the error "no function for call to 'MyClass::MyClass()'" on the line where I create object2 (MyClass object2;). I'm a total noob, so please don't roast me. XD

main.cpp

#include <iostream>
#include "MyClass.h"
using namespace std;

int main()
{
    MyClass obj1(7), obj2(8);

    MyClass res = obj1 + obj2;
    cout << obj.var;
    return 0;
}

MyClass.h

#ifndef MYCLASS_H
#define MYCLASS_H
#include <iostream>
using namespace std;

class MyClass
{
    public:
        int var;
        MyClass(int);
        void printStuff();
        MyClass operator+(MyClass &object);

};

#endif  

MyClass.cpp

#include "MyClass.h"

MyClass::MyClass(int x):var(x)
{
}

void MyClass::printStuff(){
    cout << var << endl;
    cout << this->var << endl;
    cout << (*this).var << endl;
}

MyClass MyClass::operator+(MyClass &object){
    MyClass object2;
    object2.var = this->var + object.var;
    return object2;
}

[TheIdeasMan]

Hi,

When the compiler sees this:

MyClass object2;

It needs a default constructor, and you don't have one. You can default it:

class MyClass
{
    public:
        int var;
        MyClass(int);
        MyClass() = default;
        void printStuff();
        MyClass operator+(MyClass &object);

};

You have another problem:

cout << obj.var;

obj is not an object, did you mean res?

One should not have public class variables. But you are a beginner, so that is OK for now, but try to avoid that habit very soon.

Good Luck!!

[TheIdeasMan]

Yes, that is the idea of private variables.

Have a read of the tutorial: http://www.cplusplus.com/doc/tutorial/classes/