Re: overloading a function name in a package? How to query all names?
- To: mathgroup at smc.vnet.net
- Subject: [mg110833] Re: overloading a function name in a package? How to query all names?
- From: Vincent <sheeplane at gmail.com>
- Date: Thu, 8 Jul 2010 03:14:17 -0400 (EDT)
- References: <i0urgq$6kp$1@smc.vnet.net>
On Jul 6, 11:03 am, "Nasser M. Abbasi" <n... at 12000.org> wrote: > Hello; > > I have package where I overloaded the same function name, defined to > accept different arguments. as follows: > > ------------------- > BeginPackage["foo`"] > > boo1::usage="call me as follows: boo1[a,b]" > boo1::usage="call me as follows: boo1[a]" > > Begin["`Private`"] > > boo1[a_,b_]:=Module[{},Print["in v1 of boo1"]]; > > boo1[a_]:=Module[{},Print["in v2 of boo1"]]; > > End[] > EndPackage[] > -------------------------------- > > Now, I do > > <<foo` > > And I can call either of them OK > > boo1[1,2] > boo1[1] > > But when I do > > Names["foo`*"] > > It only shows name boo1 once. (I can understand this*) > > And when I do > > ?foo`* > > It only list boo1 once. It seems to show the ::usage of the last one. > OK. I can understand this. > > But, then, is there a way to show the user than I have more than one > version of the same function name in the package? Without having to look > into the package file? > > I'd like to overload the function name, since I need to call it > differently sometimes, and I do not want to make up new names of the > same function, as in booV1[], booV2[], etc... since they all do the same > logical action, but accept different arguments depending on the options > needed, and so they all just have the same name, and the correct version > will be called depending on the arguments used. > > Overloading works OK when calling. I am just asking on how to show that > I have more than one function of the same name in the package, so I know > how to call each one. > > I looked a the docs, but so far, did not see anything. will keep looking.= ... > > thanks > --Nasser I'm not an expert, but I think you just have your terminology mixed. You don't actually have two different functions, you have a single function which acts differently depending on its number of arguments. It's like for example that List[1,2,3] is the same function as List[1,2]. So you should state in your usage definition that the function acts in one way when given one input, and another given two inputs.