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[ 原始碼: liblexical-underscore-perl  ]

套件:liblexical-underscore-perl(0.004-3)

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access your caller's lexical underscore

Starting with Perl 5.10, it is possible to create a lexical version of the Perl default variable $_. Certain Perl constructs like the "given" keyword automatically use a lexical $_ rather than the global $_.

It is occasionallly useful for a sub to be able to access its caller's $_ variable regardless of whether it was lexical or not. The "(_)" sub prototype is the official way to do so, however there are sometimes disadvantages to this; in particular it can only appear as the final required argument in a prototype, and there is no way of the sub differentiating between an explicitly passed argument and $_.

lexical::underscore allows you to access your caller's lexical $_ variable as easily as:

 ${lexical::underscore()}

標籤: 軟體開發: Perl 開發, 函式庫, 實做語言: Perl

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