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Mon, 04 Jan 2021 17:33:18 +0100 To: Matthew Ryan References: <9315a69b-5512-7968-2804-785add2d14ea@web.de> Cc: caml-list@inria.fr From: Markus Elfring Message-ID: <1c590ac8-a4ce-bae8-fce4-cc12ef7fc172@web.de> Date: Mon, 4 Jan 2021 17:33:18 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-GB Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:XiMCXVG/CowPwF9Azh2dDatqNInFINWBjVsUemdP9ntvsiU4cOV sYlzPAVbQLxozyJzMQD/FgZpdpZ8srhscMxm1cWrBKjOjlBhvLd3oncsZ7mkepUbCRkeGGF vQ3DnCUCI9VPfAcJA1vvh45x6ckYm0dsrm1BRvJakIX7Z+I8y+el9lixEEsr65HRQ0K/xbE Am9QW/5TIsAtxDyeNWmmQ== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1;V03:K0:gAIiX2OLYI8=:bBRWdmiRQkdkS9w+inru3p t7Cs3Tk8Xb5QcmsQJ+vJtrmU48atbf4luMoI/N7ghi48/8piojbrwwSeyNB6bCsMX3cZJnufy rypJBBFR2s2WnfSbVU8xRi7IzzdANb4y3gPmMZQlIQXsJVb4VnLMAaU8+cXtHwlRM6CL9dLpB TmPs+1A3qP6MquhWCpeJImcLjhLhLbVMKjPLtNNhPOqt50pmv+QBZ/Qp547GED/Lv+J775hbx s3ZA0cQWfHl3XMLOwYyibPGvTjdvUKYpNM1AQjjDXG31+gmPPbRlwhuAXzmZeUTbHdMwrBLWA ea/WMx2z6SoJ8AcmhtULHUGI+P0X74zU/AWI+r6UgnsiCxyJzu4QNuTfv3EYIi0gp3gPXqWyq xsdTrkWeSvlq6X6NyKoai1XLw1NdyVppgqNWbt5UYxsZnvpVeFTqmvvrSZpytGTUmXXnU6Drn UwStWD/yM/iE4/BRGdb2wuAYduRqMjm3Zk+iRQ1CIKLHBT6lWX6qv1BknwKZSXSJEDUVQC/Mp 7LxNbYYmslz82PQ3boi5acBhzpt0RSMLiP7cBYGXW0bEg5R3TOIVEB5W0dMZ+gurTbzRlTZH+ SzEiJxOlxckG0RDm5CnVa/LQiegmgyfEKCJBNrlsBCtEZRf45lg5ZryXAaYttJJzRgrA4iXqo Y/Vu/lkwG2nIdA7JVtQ9qeaoCWPXBscqU3FO/BQZbXBh5U933f/wI/QtIGg8H3Q3YkbkwKWhd zYHuNPI0osJqXQlIjLiUb3TyofRm9Ezkt2Ts2CvQq/5lqB2VJrCHUG4Z8KqnKRgSdn2GYAyns 9H4XKSXmFdc8U1sL3Fg6tYgwE5xPz0/jsvaKu/K3zLkB2E3kTxYWq9g7oVH5dlZA/Tesp1ZDF zF5oTlN5WuFixEpR3PbA== Subject: Re: [Caml-list] Documentation challenges for the application of comparison functions Reply-To: Markus Elfring X-Loop: caml-list@inria.fr X-Sequence: 18333 Errors-To: caml-list-owner@inria.fr Precedence: list Precedence: bulk Sender: caml-list-request@inria.fr X-no-archive: yes List-Id: List-Help: List-Subscribe: List-Unsubscribe: List-Post: List-Owner: List-Archive: Archived-At: > It's not equivalent per se, since you lose the flexibility to call the f= unction with e.g. > > let find_float_int ~(cmp : float -> int -> int) (index : float) (map : (= int, 'c)) =3D > =C2=A0 find ~cmp index map;; I guess that there is the detail to reconsider if comparisons should be pe= rformed with different data types (which corresponding to special properties of such a programming interface). > where 'a =3D float and 'b =3D int. However, it is valid Thanks for such a view. > -- and arguably describes the function's contract better -- to narrow th= e function's type by combining the type variables: I would interpret involved aspects in further directions. > let find : cmp:('a -> 'a -> int) -> 'a -> ('a, 'b) t =3D find;; The elements of a data container like =E2=80=9CMap=E2=80=9D should usually= refer to the same data type, shouldn't they? I am curious then under which circumstances a type like =E2=80=9CComparabl= e=E2=80=9D can be applied instead. Will any =E2=80=9C=E2=80=A6able=E2=80=9D types become more popular? Regards, Markus