What are valid Perl module return values? -

-

The common thing in Perl is that 1; End the module with so that the call can be checked for success, is there any reason why the return value can not be another real value? In my test, this does not seem to be the cause of any problem, but I would like to know if anyone has any issues (such as some other modules or prejs or some values ​​that are actually assumed on 1 And not just the truth).

EDIT: By popular opinion, and because it will work only once (good tip), the code example has gone, the consensus is that it is safe to return any true value, But never calling in that value should not believe because requirement will return 1 after first loading

I have been fooled at the end of my module for a while I keep things. There is no harm in it and it has a small easter egg "Yes, this code is a joke." There is a full crack in them.

Take this one step further, sometimes when a function is returned to true and false i true I'll return anything other than 1. This is to punish those who write if foo () == 1 , they mean if foo () it was around the same period that I was typing < Code> use constant = TRUE = & gt; 1 == 1; Continuous FALSE = & gt; ! TRUE;

I have seen the return value of the module used in the output code. I do not remember why the developer's logic was actually ... torture I believe that it was not like writing two lines instead of two. I do not remember why he did not export it only.

This was the same developer who passed the debate around % _ ( * _ symbol global in the package ) And map descriptions have written 150 line map details.

By removing the danger of using the return value, it works only once.

Foo.pm package $ Foo; The return "Basket Hoods got long ears"; $ Cat test.plx #! / Usr / bin / perl -w Print foo is required, "\ n"; Print is required, "\ n"; $ Pearl-I Test.plx evaluates Foo.pm and calculates return value for the first call

for long ears near Basset hounds . The second call already looks in % INC and just gives the truth and you can not even make sure that you are the first thing you need to code. You can meet it with the do "Foo.pm" but now each time you are reloading modules with the precautions about the redefined routine, problems for display and possibly global Resume is not worth it.


Comments

Post a Comment

Popular posts from this blog

c# - How to capture HTTP packet with SharpPcap -

-
I would like to capture all incoming HTTP packets on my machine. To do this, I am using SharpPcap which is a WinPcap The cover is. SharpPcap works very well, but it captures TCP packets and what it wants to do for me is a very low level. Does anyone know how can I easily get full HTTP requests / reactions from all these TCP packets? Thanks SharpPcap is already able to capture the packet in the same way That's what the virus does (just in the code instead of the GUI). And you can either either parse them directly or you can put them in the drive in the common .pcap file format. The steps to parse the capture are: Open a connection at any time Loop a while Or start capturing using an event callback Parsing the raw packet for the type you want If you are reading .PPP dump files In addition to calling you an offline capture reader is almost the same, there is no need to select an interface, and you can set the majority There is no need to do the modes. All st
Read more

jquery - SimpleModal Confirm fails to submit form -

-
I am trying to confirm jQuery to show yes / no confirmation when I submit a form. I had modified (in the last list) to capture and block form submissions. However, it only works with jQuery 1.2.6, a recent upgrade stops 1.3.2, if yes is clicked, then by submitting the form. But I can not understand what is wrong / inconsistent in my code now. Demo (which works in both versions of a simple window.href implementation). $ (document) .ready (function () {$ ('input.delete'). Click (function (e) {e.preventDefault (); var target = $ (e .target); Confirm ("Really delete this event?", Function () {target.click ()});});}); How about something like this? The idea of ​​catching clicks (and fire!) On the submitted event is not click event. $ (document) .ready (function () {$ ('# myForm'). Submit (function () {var f = this; Confirm (" Remove? ", Function () {$ (f). Submit ();}) Return; Return the initial session;}}}}; Hope That this is som
Read more

php - Multiple Select with Explode: only returns the word "Array" -

-
By using Wordpress I have created a multiple selection box so that users can select categories to exclude. When the page is initially loaded, I see my predefined default option. However, when I select a new value and I save ... I only see the word "Array" and have not chosen anything else? & lt; Class = "amultiple" id = "& lt; php echo $ value ['id'] ;? gt;" name = "& gt; php echo $ value ['id'] ;; gt; []" Multiple = "multiple" size = "8" & gt; & Lt ;? Php global option; Foreign currency ($ value as value $) {if (get_settings ($ value ['id']) === FALSE {$$ value ['id'] = $ value ['std']; } And {$$ value ['id'] = get_settings ($ value ['id']); }} $ Ranges = & amp; Amp; Categories ('type = post & orderbiz = name & amp; hide_empty = 1'); If ($ ranges) {$ ex_cat = implode (',', $ tt_cat_exclude); Forex Currency ($ range a
Read more