Re^2: Using ternary operator as lvalue in push

[ikegami]

Youch, that's completely wrong.

First of all, the basic idea is wrong. Relational operators (like >) have higher precedence than the conditional operator (?:), so attempting to raise the precendence of > using parens is a no-go. (See perlop.) *

Furthermore, you actually made things worse by adding the parens because
push ($cond > 0) ? @a : @b, $elem;
is the same as
push($cond > 0) ? @a : @b, $elem;
is the same as
(push($cond > 0)) ? @a : @b, $elem;
which is quite wrong.

Finally, even if done right, the parens don't help. Both
push(($cond > 0) ? @a : @b, $elem);
and
push((($cond > 0) ? @a : @b), $elem);
produce the same result as the OP.

* — You might be thinking of the assignment operators rather than relational operators. Since the conditional operator (?:) has higher precedence than the assignment operators (like =), $cond ? $a = 1 : $b = 1; means ($cond ? $a = 1 : $b) = 1;.