ing the number of characters</SPAN>
        <SPAN CLASS='comment'>// read; return -1 to indicate EOF</SPAN>
    }

    <SPAN CLASS='comment'>/* Other members */</SPAN>
};</PRE>

<P>Here the member type <A HREF="../guide/traits.html#char_type"><CODE>char_type</CODE></A> indicates the type of characters handled by my_source, which will almost always be <CODE>char</CODE> or <CODE>wchar_t</CODE>. The member type <A HREF="../guide/traits.html#char_type">category</A> indicates which of the fundamental i/o operati