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)>) { .... }

[download]
assuming that for and while are the perl built-ins, and that you're not using source filtering or keyword plugins etc.

Dave.

In reply to Re^3: Getting for() to accept a tied array in one statement by dave_the_m
in thread Getting for() to accept a tied array in one statement by perlancar

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