C++ passing variable by reference (SFML window) -


i have problem passing variable reference. try draw in sfml window in class won't draw. if uncomment commented lines works. doing wrong?

#pragma once  #include "stdafx.h" #include <sfml/graphics.hpp> #include "ball.h"  int _tmain(int argc, _tchar* argv[]) {   sf::renderwindow window = sf::renderwindow( sf::videomode( 640, 480 ), "sfml window" );    ball my_ball = ball ( sf::vector2f( 320.0, 240.0 ) );    window.clear();   my_ball.draw(window);   //sf::circleshape circle;   //circle.setradius( 30 );   //circle.setposition( sf::vector2f( 320.0, 240.0 ) );   //window.draw( circle );   window.display();    while(window.isopen()) {     sf::event event;     while( window.pollevent(event) ){       if( event.type == sf::event::closed ){         window.close();       }      }     sf::sleep( sf::milliseconds( 20 ) );   }   return 0; }

ball.h

#include <sfml/graphics.hpp>  class ball {   public:     ball( sf::vector2f position, float size = 30.0 );      void draw( sf::renderwindow & window ) const;    private:     sf::vector2f position;    float size;    };

ball.cpp

#include "stdafx.h" #include "ball.h"  ball::ball( sf::vector2f position, float size ) {   position = position;   size = size; }  void ball::draw( sf::renderwindow & window ) const {   sf::circleshape circle;   circle.setradius( size );   circle.setposition( position );   window.draw( circle ); }

why assigning themselves? that's wrong

ball::ball( sf::vector2f position, float size ) {   position = position;   size = size; }

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