如何在Perl中指定软件包版本? [英] How do you specify a package version in Perl?

问题描述

我对5.10.0之前的文档与较新的版本之间的建议存在冲突感到有些困惑模块. Perl最佳做法可以很清楚地看出版本字符串('v1.0.3')是错误的，并且是一个应该指定如下版本:

I'm a bit confused by conflicting advice between pre-5.10.0 documents and the more recent version module. Perl Best Practices makes it pretty clear that version strings ('v1.0.3') are bad and one is supposed to specify a version as follows:

use version; our $VERSION = qv('1.0.3');

但是版本模块说我们要返回使用版本字符串:

but the version module says that we're back to using version strings:

use version 0.77; our $VERSION = qv("v1.2.3");

我们退步了，还是背后有原因?

Have we regressed, or is there a reason behind this?

推荐答案

您从 Perl最佳实践中引用的报价不太正确.具体来说，裸形式的vstrings

Your quote from Perl Best Practices is not quite right. Specifically, bare vstrings of the form

our $VERSION = v1.0.3;

不鼓励

.在最新版本的version.pm中，建议使用真实的字符串:

are discouraged. In the latest version of version.pm, the recommendation is to use true strings:

use version 0.77; our $VERSION = qv("v1.2.3");               # shorthand

已添加此功能以提高可读性，同时特别避免描述此处.

This functionality has been added to aid readability, while specifically avoid the traps of bare strings described here.

如您链接到的文档页面所述，您可以使用版本，而无需使用Perl 5.10中的内置逻辑在前面加上'v':

As the doc page you linked to says, you can use versions without the pre-pending 'v' using built-in logic in Perl 5.10:

如果您有一个使用十进制$ VERSION(浮点数)的模块，并且您不打算对此进行更改，那么此模块不适合您.仅通过简单的$ VERSION分配，version.pm就不会给您带来任何好处.

If you have a module that uses a decimal $VERSION (floating point), and you do not intend to ever change that, this module is not for you. There is nothing that version.pm gains you over a simple $VERSION assignment.

因此，您的问题的答案是:如果要编写使用version.pm的新代码，请使用新的"v1.0.3"语法.如果那是您的旧代码编写方式，或者不想显式依赖module.pm，请坚持使用纯数字.

So the answer to your question is: use the new "v1.0.3" syntax if you are writing new code that uses version.pm. Stick to a plain number if that is how your old code was written, or if you don't want to depend explicitly on module.pm.

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