Comments (1)
Made some more progress on this tonight (see changes 7ea02cc and d218225). The following now works:
(defmulti area)
(defmulti perim)
(defmethod area 'triangle
((`#m(base ,b height ,h))
(* b h (/ 1 2))))
(defmethod perim 'triangle
((`#m(base ,b height ,h))
(+ b h (math:sqrt (+ (* b b)
(* h h))))))
(defmethod area 'circle
((`#m(diameter ,d))
(area `#m(type circle radius ,(/ d 2))))
((`#m(radius ,r))
(* (math:pi) r r)))
(defmethod perim 'circle
((`#m(diameter ,d))
(perim `#m(type circle radius ,(/ d 2))))
((`#m(radius ,r))
(* 2 (math:pi) r)))
With usage being simply this:
> (area #m(type triangle base 6 height 10))
30.0
> (perim #m(type triangle base 6 height 10))
27.6619037896906
> (area #m(type circle diameter 8))
50.26548245743669
> (perim #m(type circle diameter 8))
25.132741228718345
So far, the macros only support the rather trivial usage shown above, with the type
hard-coded. The next steps are:
- Allow users to pass the attribute name in
defmulti
- Support multiple attributes (for multiple dispatch)
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