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Re^2: Getting for() to accept a tied array in one statement

by perlancar (Pilgrim)
on Apr 16, 2019 at 14:22 UTC ( #1232664=note: print w/replies, xml ) Need Help??


in reply to Re: Getting for() to accept a tied array in one statement
in thread Getting for() to accept a tied array in one statement

Yes, in this case the goal is on how easy it is to add a progress indicator to an existing code that uses for(). If a user has to change her for() to while(), that would count as less easy. It's akin in spirit to data dumping modules like XXX or Data::Dmp that returns its original argument so you can insert XXX or dmp just about anywhere in an existing Perl code.

Next step after I conquer for(), will probably move on to while(). :-) Yes, I'll be looking into overloading the diamond operator or tying filehandle.

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Re^3: Getting for() to accept a tied array in one statement
by dave_the_m (Monsignor) on Apr 16, 2019 at 15:01 UTC
    I don't think its possible in perl to write a function foo() that will allow any of the following in the way you want:
    for (foo(list)) { ... } while (foo(list)) { .... } while (<foo(list)>) { .... }
    assuming that for and while are the perl built-ins, and that you're not using source filtering or keyword plugins etc.

    Dave.

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