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Sat, 02 Jan 2021 16:42:44 +0100 To: caml-list@inria.fr From: Markus Elfring Message-ID: Date: Sat, 2 Jan 2021 16:42:43 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Language: en-GB Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:kKtmD5+pWl761l1uz2/kHEc2tR7DbSmzrj9jANm8fwRwiRS0kSE L7uxNeiW/FLmAKfxKr4nsr1PWnq5TjVlTImV3ACU/DfhEdmGaFz9tCp3IjDSQf1te3mF6bc pxN+Ee0M9ZcXoNUNGBHj0zz+e0Urlb8UmbTqQHdBwTvfyrkQuqBKQ2sxXzg1MDiNzUPAIfq gguPhElLxGRtHBDcEwUCQ== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1;V03:K0:mTYYLbtoehw=:7+dEyI97+CXlw1bsMNZ74C HSs82ZjjblctKnBLvh1aF+EOXdwQWTDvYltyWd2UmK6a8redbuMCMup4ujC56mC3MRfpG/2Mq uDOFz/Hk2J8bkqZkv+BHNPuKO+obJNtuat6X/MPZ7n37du5VpRuTxdGYpQjn3c6T6zaI/Vs4l C6PDy23IluePGXlaVgYR6sl88u6s2JeLDKgeQvBbRouFp1DIL/JXQbbtIaCfwweav40TOsjEe NTtatMYHGGdtkr+Xy7JR+VBxShCcDlJq4ctEhGs3xmuyGmpszwY4NWZDI44cIqYWLVd0hcxvV nD7Qfd4HYSm5EN2QiwsDC7TTwB4jxIQI8XGkKR5xwP0VsrE8ByPxzj1D4X/8CtzfW75vKxCSr MEDCLFQU99kMmUArTbWphKgbqf9TF1lsDMDwdqwRBklP443uA/WqjyLyMptHyThYTnXmZ4hN8 O/ktnF7HUKi8Y6ZXjrgSW1hHHoE4sgokZ58WmOO2QfX5A/eW7XMMpobkathPmcXL1u76VLYQW cFb83vGXusdsWihGC1vKRr7ZqD7byt0rke+//HeubZJTi2ybjHqqiAaiMyBb7IaXJXf1yxKpz W3OGumNHdWR5l6h2yDjYr3IbVJkXI2MLmHbJBkjht8hzV1qeRh0bsNlxTMZ+5loKTpp7ws+9t nYpsiPkLqNlDYNhqLJsPVq8GnDbFJDIjLqSbnoPga4HCBvK1PTr24gOww0YqUHpxGaOaEYtwD 3Nvg3LtwVuB6coKldz+/lR02sfJRvVcV7g5VxBzWwEM6KvyjPGgMYPpz9RExtwxjCAzWg4Zc0 EuCxZEzpgUxE7D4Y0uaLJE1RFD7y6nGmhtjz8iySyjDvWxw88B94HVU2AG5/arVZ8kUtqsPgG avHo17/2I6pV2wnrAPVw== Subject: [Caml-list] Documentation challenges for the application of comparison functions Reply-To: Markus Elfring X-Loop: caml-list@inria.fr X-Sequence: 18326 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: Hello, I have taken another look at a few functions of a software library where comparison functions should be passed. =E2=80=A6 let rec find ~cmp x =3D function Empty -> raise Not_found | =E2=80=A6 let not_found_default_action ~value ?compare:(cmp=3DStdlib.compare) =3D raise Not_found =E2=80=A6 Interface descriptions can be generated then in a known format for OCaml 4= .11.1. =E2=80=A6 val find : cmp:('a -> 'b -> int) -> 'a -> ('b, 'c) t -> 'c val not_found_default_action : value:'a -> ?compare:('b -> 'b -> int) -> '= c =E2=80=A6 Now I find two details interesting for further clarification. 1. The first reference for a comparison function seems to express a need f= or different data types =E2=80=9C'a=E2=80=9D and =E2=80=9C'b=E2=80=9D whil= e a single type might be sufficient for the comparison function according to the second function. 2. The specification of =E2=80=9CStdlib.compare=E2=80=9D looks clear accor= ding to the semantics for a default parameter in a ML source file while the OCaml arrow repre= sentation can look more challenging. How would you recognise that such a function parameter should be applie= d for comparison calls? Regards, Markus