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Smells like duck-typing
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Dario Teixeira
- Arnaud Spiwack
- Daniel_Bünzli
- Chris King
- Zheng Li
- Vincent Aravantinos
- Richard Jones
- Dario Teixeira
- Vincent Aravantinos
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| Date: | -- (:) |
| From: | William D. Neumann <wneumann@c...> |
| Subject: | Re: [Caml-list] Smells like duck-typing |
On Thu, 18 Oct 2007 12:43:10 -0400, Brian Hurt wrote > So now you've defined full_story, blurb_story, and fresh_story as > types. Now, I write: > > let get_body (story: full_story) = story#get_body;; > > let my_blurb = new blurb_story(id, "A Title", "An Intro");; > > let my_body = get_body my_blurb;; > > what happens? One would assume the same thing that happens if you were to do: class full_story = object inherit blurb_story val body method body = body end;; let get_body (story: full_story) = story#get_body;; let my_blurb = new blurb_story(id, "A Title", "An Intro");; let my_body = get_body my_blurb;; That is an error indicating that my_body has type < id : int; title : string; summary : string > but is used with type < get_body : string ..>, < id : int; title : string; summary : string > has no method get_body. No? -- William D. Neumann