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Re^8: Burned by precedence rules (eqv)

 on Dec 31, 2008 at 03:17 UTC ( #733392=note: print w/replies, xml ) Need Help??

in reply to Re^7: Burned by precedence rules (eqv)
in thread Burned by precedence rules

Well, we can't use eqv because we already use that for something else, but we do have a Boolean not-equal already:
```    \$x ?^ \$y
What we don't have is a Boolean equal. I thought about adding:
```    \$x ?= \$y
but people would probably think that means:
```    \$x = \$x ? \$y;
which is nonsense, but they'd still think it. :-)

Anyway, the utility is not worth the extra complexity, in my opinion. Comparing two Booleans for equivalence is an odd enough thing to do that I don't mind if it looks a little odd.

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Re^9: Burned by precedence rules (eqv)
by tilly (Archbishop) on Dec 31, 2008 at 03:58 UTC
What about saying that !( potential boolean operator ) means the boolean negation of the boolean operator? That would naturally give you the logical operators !&& (nand), !|| (nor) and !^ (not xor). The last would, of course, be Boolean equals.

(I can't believe I just suggested that.)

Re^9: Burned by precedence rules (eqv)
by tye (Sage) on Dec 31, 2008 at 03:47 UTC

Note that I did include a winky smiley. But I saved the clincher argument for now: Perl 6 is becoming so like VB, it will be very surprising to VBers when the purpose of eqv is so different. :-D

- tye

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