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MathGroup Archive 2007

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Re: Difference between Needs and using the second argument

  • To: mathgroup at smc.vnet.net
  • Subject: [mg77617] Re: [mg77527] Difference between Needs and using the second argument
  • From: Carl Woll <carlw at wolfram.com>
  • Date: Thu, 14 Jun 2007 05:15:36 -0400 (EDT)
  • References: <200706120519.BAA09366@smc.vnet.net>

Andrew Moylan wrote:

>Is there any difference between (i) using the second argument of
>BeginPackage or (ii) explicitly calling Needs on any required packages?
>  
>
The difference is whether the symbols in the required packages are on 
the context path after loading the package. For example, with:

BeginPackage["MyPackage`", {"OtherPackage`"}]

after loading

<<MyPackage`

the exported symbols in OtherPackage are also available to the user. 
While, with

BeginPackage["MyPackage`"]

Needs["OtherPackage`"]

after loading

<<MyPackage`

the exported symbols in "OtherPackage" are not available to the user.

Carl Woll
Wolfram Research


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