Re: Why eval $version?

> Q1) What purpose does this line serve?

the long read: https://xdg.me/blog/version-numbers-should-be-boring/

in short: there are different notations for version numbers which only become comparable after eval.

> Q2) Is this a "string eval?"

yes

> Q4) Does anyone else remember the "that's why we eval version" comment, or is it just me?

Sawyer gave two talks, probably you are confusing them?

Cheers Rolf
_{(addicted to the Perl Programming Language :)

Wikisyntax for the Monastery}

Comment on Re: Why eval $version?

Replies are listed 'Best First'.
Re^2: Why eval $version? by syphilis (Archbishop) on Jul 09, 2020 at 00:16 UTC
there are different notations for version numbers which only become comparable after eval Yes, there are some notations that require the eval. However, I believe the eval is not needed for comparison when the version string notations are valid floating point numbers (eg "2.31" or "3.20200729"). Cheers, Rob	[reply]
Re^3: Why eval $version? by LanX (Saint) on Jul 09, 2020 at 00:56 UTC
One can use _ as delimiter in long literal numbers but not when numifying strings. `"3.202_007_29"` Eval treats the string as a literal number. Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery}	[reply] [d/l]
Re^4: Why eval $version? by syphilis (Archbishop) on Jul 09, 2020 at 03:31 UTC
One can use _ as delimiter in long literal numbers but not when numifying strings Yes- that's pretty much the point I was making. However, I wasn't sure if the need to eval comes about solely by introducing an underscore, so I chose to specify the strings that don't require eval rather than the strings that do. I had wondered whether eval might also cater for version strings that contain multiple decimal points (v-strings), but a quick check suggests that's not the case. (Someone please let me know if I've got that wrong.) Cheers, Rob	[reply]
Re^5: Why eval $version? by LanX (Saint) on Jul 09, 2020 at 13:00 UTC
Re^6: Why eval $version? by syphilis (Archbishop) on Jul 09, 2020 at 14:03 UTC
Some notes below your chosen depth have not been shown here
Re^5: Why eval $version? by LanX (Saint) on Jul 09, 2020 at 13:20 UTC
Re^4: Why eval $version? by AnomalousMonk (Archbishop) on Jul 09, 2020 at 01:40 UTC
++ on both posts, except why would one group the fractional digits as `"3.202_007_29"` rather than as `"3.2020_07_29"`, which seems much more intuitive to me? Give a man a fish: `<%-{-{-{-<`	[reply] [d/l] [select]
Re^5: Why eval $version? by LanX (Saint) on Jul 09, 2020 at 13:06 UTC


go ahead... be a heretic
	PerlMonks