Abstract Data TypesAn Example Package Declaration

PACKAGE complex_type IS

CONSTANT re : INTEGER := 0;

CONSTANT im : INTEGER := 1;

TYPE complex IS ARRAY (NATURAL RANGE re TO im) OF REAL;

FUNCTION "+" (a, b : complex) RETURN complex;

FUNCTION "-" (a, b : complex) RETURN complex;

FUNCTION "*" (a, b : complex) RETURN complex;

FUNCTION "/" (a, b : complex) RETURN complex;

END complex_type;

Previous slide

Next slide

Back to first slide

View graphic version

This is a package declaration for a package that implements a complex number data type. Note that the data type is given as well as some standard operators on that type.