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Re: what is the meaning of $| in perl?

by vinoth.ree (Monsignor)
on Mar 11, 2014 at 08:52 UTC ( #1077815=note: print w/replies, xml ) Need Help??


in reply to what is the meaning of $| in perl?

Whenever you print data on a filehandle, it will be buffered and the data will not be availale in the file, until the buffer get full.

In Perl, we can not turn the buffering off, but you can get the same benefits by making the filehandle hot.

Here in you code select(LOGFILE); make the LOGFILE filehandle to be selected and $|=1, which is the special variable in perl, If you set it to a true value, it makes the current filehandle hot. So Perl will flush the data in the buffer immediately once you print on that filehandle.select(LOGFILE); select will return the currect filehandle.


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[choroba]: Algorithm::Loops
[Corion]: choroba: I'm using that to generate the permutations, but I don't know how the user can pass the intended values to my function in a sane way
[Corion]: I have a prototype that permutes the get_parameters, but the values used for the get parameters should be different from the values used for the headers and potentially for parts of the URL
[Corion]: But yes, in general, my approach will be "split the URL into another set of parameters, generate an array of allowed values for each parameter and then NestedLoops() over the set"
[choroba]: hmm... so you need something like bag from Test::Deep, but not for checking, but for generation
[Corion]: This has the dual use of easily requesting sequential URLs and also being suitable for testing
[Corion]: For testing, I want to skip all tests with the same value(s) once one test fails to cut down on the number of failing tests
[Corion]: choroba: Yes, in a way I
[Corion]: ... I'm treating the incoming value sets as bags... Maybe I'll just put the burden on the user, at least in the first attempt at a full API. generate( headers => [{ 'Content-Type' => 'text/plain' }, {'Content-Type' => 'text/json' ] ), even ...
[Corion]: ... if that is cumbersome for the caller to specify. On the other hand, maybe there isn't that big a need for permuting the header values

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