Shouldn't it be in the language - that the $_ variable is by default localized to module? It's hardly usefull to maintain the topic across multiple modules. Anybody knows how it is to be in Perl 6? | [reply]
[d/l] |
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[d/l] |
I did not say that it should be mandatorily localized. What I meant was to localize it by default, and when the author wants there should be a language construct to override that behaviour.
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It's discussed in Apocalypse 6, though lore had it that $_ would indeed be lexically scoped to each sub.
Furthermore, a method will see $_ as "this" upon entry, so it will almost never work the old way (sorry, Abigail-II).
Page 9 shows "Your caller's current topic is named $CALLER::_." and goes on to illustrate how to use it as a default parameter, so if you call it without an argument the function uses the caller's $_. But the function can call it by whatever formal name it likes for that parameter.
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