Beefy Boxes and Bandwidth Generously Provided by pair Networks
laziness, impatience, and hubris
 
PerlMonks  

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
I may be missing something obvious but if I have Perl 5.12 installed why should I have to specify:
use 5.012;
You are missing that fact that you don't have to.

Can't Perl detect which version is installed or something?
No, Perl cannot, but perl can. The point is, use 5.012; appears in the Perl program, and when the perl binary runs, it checks whether its version is at least the version required by the program. If not, the program is terminated with an appropriate message.

Note that since 5.10, use 5.010; (or later, or using use 5.10.0) there's an implied use feature ':5.10'; (or whatever version number you used). And since 5.12, the use version will enable strict. No enabling of features or strict happen when using require.

Also note that use v5.10; == use 5.10.0; == 5.010;. But use 5.10; == use 5.100;. Which, IMO, is not very DWIM.

I don't know whether there's a (single-line) syntax that at compile time checks for 5.10, but which doesn't enable features.


In reply to Re: Why version strings? by JavaFan
in thread Why version strings? by gunzip

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible editor intervention).
  • Want more info? How to link or How to display code and escape characters are good places to start.
Log In?
Username:
Password:

What's my password?
Create A New User
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others wandering the Monastery: (2)
As of 2021-05-11 12:41 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    Perl 7 will be out ...





    Results (116 votes). Check out past polls.

    Notices?