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From: Andy Little (andy_at_[hidden])
Date: 2004-12-31 07:17:12

"Alan Gutierrez" <alan-boost_at_[hidden]> wrote

> Are we talking about the same thing? Interface and implentation
> are overloaded terms.

// interface (ABC)
struct graphics_element{
    virtual void draw(Context c) =0;
// gui object..
struct my_wnd
: graphics_element,
 { void draw(Context c); ...};

//simple line definition...
template <typename Units> //
struct simple_line{ point<Units> start,end;}

// dumb drawable line
template <typename Units>
struct drawable_line
 : simple_line<Units>, graphics_element{
    void draw(Context c);
    Units thickness;
    Color color;
template <typename Units>
struct active_line
 : drawable_line<Units>, user_action_handler,

// text
struct text_element : graphics_element {..}
// edit box
struct active_text : text_element,user_action_handler,

Andy Little

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