How to use a pure virtual method inside a class?

Question

OOP

I'm trying to define the parent class:

#ifndef OBJECT_H
#define OBJECT_H
#include <sstream>
#include <string>


class Object
{
private :
    virtual void fillBufferForPrint(std::ostringstream &strs) = 0;
public:
    Object();

    operator std::string();

};

#endif // OBJECT_H

#include "object.h"

Object::Object()
{

}

Object::operator std::string() {
    std::ostringstream s;
    fillBufferForPrint(&s);
    return s.str();
}

When I try to build the project, I get the following error:

***/object.cpp:10: error: no matching function for call to 'Object::fillBufferForPrint(std::ostringstream*)'
     fillBufferForPrint(&s);
                          ^

How can this be overcome?

Answer 1

In the declaration, the method takes a reference, and you pass in a pointer.

fillBufferForPrint(&s); // Нужно не так.
fillBufferForPrint(s);  // А так.