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14 class design (1)

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Satyam Gupta
Satyam Gupta
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Chapter 14 Graph class design Bjarne Stroustrup www.stroustrup.com/Programming
Abstract ,[object Object],[object Object],[object Object],[object Object],[object Object],Stroustrup/Programming
Ideals ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Stroustrup/Programming
Logically identical operations have the same name ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Stroustrup/Programming
Logically different operations have different names ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],(100,200) p1: (200,300) p2: attach() add() Stroustrup/Programming (100,200) (200,300) &ln ln: win:
Expose uniformly ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Stroustrup/Programming
What does “private” buy us? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Stroustrup/Programming
“ Regular” interfaces ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Stroustrup/Programming
A library ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Stroustrup/Programming
Class Shape ,[object Object],[object Object],Rectangle Image Stroustrup/Programming Shape Polygon Text Open_polyline Ellipse Circle Marked_polyline Closed_polyline Line Mark Lines Marks Axis Function
Class Shape – is abstract ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Stroustrup/Programming
Class Shape ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Stroustrup/Programming
Class Shape ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Stroustrup/Programming
Class Shape ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Stroustrup/Programming
Class Shape ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Stroustrup/Programming
Class Shape (basic idea of drawing) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Stroustrup/Programming
Class Shape (implementation of drawing) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Note! Stroustrup/Programming
Class shape ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Stroustrup/Programming
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Stroustrup/Programming
Display model completed attach() Stroustrup/Programming Circle draw_lines() Text draw_lines() Window Display Engine draw() draw() draw() our code make objects wait_for_button() Shape Shape draw_lines() draw_lines()
Language mechanisms ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Stroustrup/Programming
A simple class hierarchy ,[object Object],[object Object],Rectangle Image Stroustrup/Programming Shape Polygon Text Open_polyline Ellipse Circle Marked_polyline Closed_polyline Line Mark Lines Marks Axis Function
Object layout ,[object Object],Stroustrup/Programming points line_color ls Shape: points line_color ls ---------------------- r Circle:
Benefits of inheritance ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Stroustrup/Programming
Access model ,[object Object],[object Object],Stroustrup/Programming
Pure virtual functions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Stroustrup/Programming
Pure virtual functions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Stroustrup/Programming
Technicality: Copying ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Stroustrup/Programming
Technicality: Overriding ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Stroustrup/Programming ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Next lecture ,[object Object],Stroustrup/Programming

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14 class design (1)

  • 1. Chapter 14 Graph class design Bjarne Stroustrup www.stroustrup.com/Programming
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  • 20. Display model completed attach() Stroustrup/Programming Circle draw_lines() Text draw_lines() Window Display Engine draw() draw() draw() our code make objects wait_for_button() Shape Shape draw_lines() draw_lines()
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