error C2504: 'ostream_withassign' : base class undefined
<p>I am trying to learn C++ by practicing with exercises from the book but I seem to have run into yet another problem. I know the ostream_withassign class is found in the iostream library and that is included but I still do not understand what I am missing in my code still. I tried std but that does not seem to work either. Any one able to please inform me on what I am missing please. Thanks in Advance!</p>

<pre><code>#include "stdafx.h"
#include "Conios.h"


class ConsoleStream :public ostream_withassign, public Conios
{
protected:
    char X;
    char Y;


public:
    ConsoleStream(void);
    ConsoleStream(std::streambuf * Buffer);
    void SetX(char XX);
    void SetY(char YY);
    ConsoleStream &amp;operator =(std::ostream &amp;Out);
    ~ConsoleStream(void);
};
</code></pre>
