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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: <8fd3a06c-9186-a0ed-ce50-a6efb02817ba@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:K1:22lX1Q3QTLrKSWyNLDmF/gJ/OZ3E1RbdzuYYvKxv1cEs04zRu2M BazHUndmd1mwfCnXR585ILWL51e/ZXmhn31kTi3m6cpajqWsbF08X3coM+71n0TSuH81ONj j++BjZk3erSLnEihjQN37RJSTHxe2eg0MkKyqA4U5q/YDknaRG/VuQH3pJ/1FVFSovPmHjU AZy+Pd/mCfAXiikyqigfQ== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1;V03:K0:/5hsaHyaQxI=:7r06MVvFYH90Jeo27l8hY2 u2EyZZTPioyMr/vJyOcS+eR3DovVRra50MhIa7/4xwtbrHYNIv5kktKbNrG/9tAGiuN3r8YrQ wyV+1SqtKwlgvtH9+js45n9mVRY4CNKXIJEI4Ze8nnkzWVVafxDuIHcturBDW/2QVi7FMwiOr HKcpQRJemuTAfO4mPpbHtUerlwqx1QSCVb1VPidy287Hd7kb3hGnXTVC+F2QeoUzHghF7gfEN pdFgefN3SNoolCiXGFXhB320ENhZd0s/gTmmNCWArvomj7fmSLs0pOVnO+Qgo5mH0Yo7sbUsP aktp8enH8cMu85WAJ3ojgSD9UIQ2fcpwGlLmC8m0DxKXduCqVZFgnFT+Jt1y7DYkKGiJ3DTtP 5hjxhGBtBuyQ6ck9wOH3uTfAI6Rj3+dorb23YrhVrEkkREIQILvs92dYkCmEVxlsVDkVHdO8c yADuQBpd9qwzDrPY4Vhbs5hjOqhv8Oyizsxl7pORdRV7HfRXTM6ncwDWsPQRD/093i17v1/sK FVEfU8xDvo5thVSpTkat0yWgmGp2G8YaosrNmes9rm2A00P6mqYpdyBF9lcUmHH4nzkeo+dLm ConX54cNbwWdvlgOb8uw28qCt9sO7J7W3KxJvImsMrOF7VMPJN25TZ1HdtodUyhPFrx1FmuWJ v6NJpZrHA4OK2QOn1Q74d8/M3THlqmS/C7TFsdZNR4vlniV7kMtgir0lgMQ3D5g7dPtHS1dcC dSdLcZ8jBzHUpbmDFOyNdD7ZSBh5CEiGB/wdP/ZQTZirROHJ/SJ3PJWZB44q7MSf/RxwoPzNK WbTUaA6A6VPRWTJ/T0XFTKUpCC2jvaT+gDI3rAYP4/NogCQueIZEoBA3qfrZIeuj7X1jgu+EH GylzCh/s1eSDa453JVhg== Subject: Re: [Caml-list] Documentation challenges for the application of comparison functions > 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