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Postings from July 2013
On Jul 1, 2013, at 5:52 AM, Ruslan Zakirov <ruz@bestpractical.com> wrote:
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>
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> On Sun, Jun 16, 2013 at 11:31 PM, Father Chrysostomos <sprout@cpan.org> wrote:
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> On Jun 16, 2013, at 11:47 AM, Ruslan Zakirov <ruz@bestpractical.com> wrote:
> > I want to reject most lvalue operations:
> >
> > 1) %h{a} = ... as well as %h{qw(a b)} = ... should throw an error
> >
> > 2) I think lvalue subs should too as it's assignment
>
> $ ./perl -Ilib -le '$_ = "hello"; (sub : lvalue { %{{"hello" => 2}}{$_} }->()) = 3; print $_'
> 3
>
> Can I check during compile time that an op is used as return value of a lvalue sub? LVRET is runtime thing. Can not find example in the code. A pointer or a list of flags to look at?
Look for OPpMAYBE_LVSUB in op.c:op_lvalue_flags. Without that flag, LVRET always returns 0 at run time.
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