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Re^2: Difference between 'use' and 'require'

by BUU (Prior)
on Dec 07, 2004 at 09:33 UTC ( #412865=note: print w/replies, xml ) Need Help??

in reply to Re: Difference between 'use' and 'require'
in thread Difference between 'use' and 'require'

Except of course that use is evaluated at compile time where as require is evaluated at run time.

And I second the question about the stupidly large font.
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Re^3: Difference between 'use' and 'require'
by gothic_mallard (Pilgrim) on Dec 07, 2004 at 09:39 UTC

    Ah yes, forgot that one :)

    A use anywhere in the code will be evaluated when the code is run compiled, but require - import's can only get evaluated when encoutered - good for when you want one module or another but both have quite a large initialisation overhead which means you only want the one you need.

    update D'oh, sorry, meant compile not run.

    --- Jay

    All code is untested unless otherwise stated.
    All opinions expressed are my own and are intended as guidance, not gospel; please treat what I say as such and as Abigail said Think for yourself.
    If in doubt ask.

      No, you can require+import modules any time you like, even at runtime. use is at compile time.

      The reason the latter matters is because modules can change the way the rest of the source is compiled, think of integer, prototyped imported subs, or even plain subs, and constants.

      And that will not work at runtime, because it's too late.

Re^3: Difference between 'use' and 'require'
by kloro2006 (Initiate) on Jun 15, 2014 at 20:05 UTC
    @anonymous monk

    "the stupidly large font"

    if you really wanted the OP to post in a different format, you wd have made a suggestion using a civilized vocabulary or, as the first commenter did, ask a question in a civilized manner. but i suspect that you do not really care about the font the OP used. but wanted simply to vent some spleen. you are doing life in a very self-defeating manner. you are also befouling this site.

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