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Re^3: can sub check context for lvalue vs rvalue context?

by LanX (Saint)
on May 09, 2018 at 07:06 UTC ( [id://1214257]=note: print w/replies, xml ) Need Help??


in reply to Re^2: can sub check context for lvalue vs rvalue context?
in thread can sub check context for lvalue vs rvalue context?

> Yeah, returning a tied value is what I was grudgingly working on, as I didn't think it would be very efficient

There is probably a solution without XS ...

You could compare the caller in the tied STORE and set a flag $islvalue for the next call.

Like that only your first call would be inefficient.

Cheers Rolf
(addicted to the Perl Programming Language and ☆☆☆☆ :)
Wikisyntax for the Monastery

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Re^4: can sub check context for lvalue vs rvalue context?
by perl-diddler (Chaplain) on May 10, 2018 at 06:24 UTC
    I thought of that ... it was tempting, but being extra rigorous w/my stuff, I wanted the values inspected through direct inspection $p->{one} to be consistent with the ones done through the accessor $p->one.

    FWIW, in my case, I don't need to check the value before the assignment, but immediately AFTER the assignment. For example -- wanted to be able to have a URL object where I break it down into proto,site[:port]/path, then, if I assign to $p->path, it would automatically be reflected in $p->url.

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