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Example: Illustra Black Box ADT

• Point as a "black box ADT" (written in C)

create type Point

(

internallength = 16; -- typedef struct {double x, double y} point

input = point_in; -- for reading in Point constants

output = point_out; -- for displaying Point results

);

create function point_in(Text) returns Point as

external name 'MI_HOME/functions/point.so'

language C;

create function point_out(Point) returns Text as

external name 'MI_HOME/functions/point.so'

language C;

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