Poly/ML November 2013

polyml@lists.polyml.org

2 participants
6 discussions

Inspecting structures
by ramana.kumar＠gmail.com 27 Jan '16

27 Jan '16

Is there a way to look at the contents (i.e. signature) of a structure without opening it? (I suppose you could just open it then call a lot of PolyML.Compiler.forgetXXX, but that's quite tedious) Also, is it possible to retrieve the long path of an identifier in scope? Something that will, for example, take the rev in scope and say that it came from List. Finally, what about searching for an identifier that would come into scope if you opened some structures?

3 5

polyc and poly --script
by rene.neumann＠in.tum.de 24 Mar '15

24 Mar '15

Hi, two completely orthogonal questions/remarks for PolyML 5.5.1: 1.) When building PolyML with '--with-system-libffi' the '-lffi' part is missing in the linker line in polyc. 2.) Is it somehow possible to see if an ML file is run via 'poly --script' or as a standalone executable? Because for the one the logic has to be wrapped in 'fun main ()', and for the other it should not :). (Ie, what I want: if is_script then main() else () ) Thanks, Ren? -- Ren? Neumann Institut f?r Informatik (I7) Technische Universit?t M?nchen Boltzmannstr. 3 85748 Garching b. M?nchen Tel: +49-89-289-17232 Office: MI 03.11.055

4 9

[Fwd: Re: [polyml] Building Poly/ML on MacOS X 10.6]
by rda＠lemma-one.com 29 Dec '14

29 Dec '14

I wrote: > I am completely baffled. I thought I hada solved all my problems on > MacOS X > 10.6 and was just tidying up, when I had to recompile a 32 bit > version of > Poly/ML to test a tidied up make file. This failed because > PolyML.Compiler.printTypesWithStructureName no longer exists. The same > problem happened when i rebuild a 64 bit version. What has happened? but it was a false alarm: my make file was wrong for other reasons and the absence of PolyML.Compiler.printTypesWithStructureName was not relevant. No doubt there are good reasons why this variable has been withdrawn. Regards, Rob.

3 6

Incorrect floating point conversion
by fw＠deneb.enyo.de 24 Mar '14

24 Mar '14

I noticed this: Poly/ML 5.5.1 Development > val a = 0.99999999999999972244424384371086489409208297729492187;; val a = 1.0: real > val b = 0.999999999999999722444243843710864894092082977294921876;; val b = 1.0: real > a < b;; val it = false: bool > a > b;; val it = false: bool So both values are equal according to Poly/ML. But the correct conversion for the first one is (in hexadecimal floating point notation) 0x1.ffffffffffffdp-1, and for the second 0x1.ffffffffffffep-1, so the values should be different.

4 4

Flexible records and overloading
by David.Matthews＠prolingua.co.uk 01 Dec '13

01 Dec '13

The ML standard is not specific about what the "program context" should be when disambiguating flexible records and overloading. Poly/ML uses as wide a context as possible but that can mean that a program that compiles with Poly/ML won't necessarily compile with other implementations. I've added a switch PolyML.Compiler.narrowOverloadFlexRecord that defaults to false. If set to true the compiler uses a much narrower context; essentially the val binding. I've looked at a few other implementations to see what they do. The most restrictive is Hamlet which corresponds to what Poly/ML now does with narrowOverloadFlexRecord set to true. It rejects let fun f x y = x + y in f 1.0 end; which SML/NJ (110.74) accepts. Neither accept let fun f {x, ...} = x in f {x=1} end; Mlton seems to use the whole program context as Poly/ML does. David

2 2

Id like to suggest porting to Android
by monkeyrater＠hotmail.com 18 Nov '13

18 Nov '13

There are a couple of implementations for Ocaml on Android but none for SML. So Id like to suggest that you make a port for Android because mobile computing is becoming much more common and mainstream. And also the fact that Android OS is a much more stable target to port to compared to the fragmentation of Linux distros, the exclusivity of hardware costs and availability for OSX and the problems that windows 8 is bringing to user experience. -Brad Cantrell

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Poly/ML November 2013