Re: selective exporting possible?
- To: mathgroup at smc.vnet.net
- Subject: [mg8032] Re: [mg7998] selective exporting possible?
- From: Allan Hayes <hay at haystack.demon.co.uk>
- Date: Sat, 2 Aug 1997 22:32:41 -0400
- Sender: owner-wri-mathgroup at wolfram.com
mabi at solidmr.kun.nl (Marlies Brinksma) in [mg7998] selective exporting possible? writes >I have implemented some packages. The problem which I've encountered >has to do with their interface. There is one function defined in one >of these packages which I would like to be "visable" for the other >packages, but NOT for the user! Marlies, Two suggestions; 1. Make your function private: BeginPackage["helper`"]; gg; Begin["`Private`"]; ff[x_] := 4 gg[x_]:= 5 End; Protect["`*"] EndPackage; Once the package helper is loaded then ff is available under its full name helper`Private`ff. 2. Use hidden importation (Roman Marder, Programming in Mathematica 2nd edn, p36) Instead of the usual BeginPackage[..., "helper`" ..] use BeginPackage[.....] Needs["helper`"] This does not put "helper`" on the context path. Users cannot use gg ; but nor can they use any functions that you may have defined in helper`; and they cannot load "helper`" by Needs, (since "helper" is in the list $Packages, which give contexts of the loaded packages - you could remove it) -- however <<helper` still works. Allan Allan Hayes hay at haystack.demon.co.uk http://www.haystack.demon.co.uk/ voice:+44 (0)116 2714198 fax: +44 (0)116 2718642 Leicester, UK