• Subject: Re: The 4 negations of Lua
• From: "Soni L." <fakedme@...>
• Date: Fri, 16 Sep 2016 18:13:37 -0300

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On 16/09/16 05:54 PM, Rena wrote:
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On Fri, Sep 16, 2016 at 4:51 PM, Charles Heywood <vandor2012@gmail.com <mailto:vandor2012@gmail.com>> wrote:
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I'm pretty sure that wouldn't work but I'm not at a computer to test.

On Fri, Sep 16, 2016, 2:59 PM Soni L. <fakedme@gmail.com
<mailto:fakedme@gmail.com>> wrote:

On 17/09/16 02:18 AM, Martin wrote:
>
> On 16-09-05 12:29 PM, Soni L. wrote:
>> Lua has 4 forms of negation:
>>
>> -
>> ~
>> not
>> ~=
>>
>> Yet only 2 of them can be overloaded.
>>
>> It's cool that Lua has 4 forms of negation tho.
> As I understand "-" is for general numbers, "~" for integer
numbers,
> "not" for general logic and "~=" for equivalence logic. From
them only
> "~=" may be dropped and reformulated as "not ==".

What, "~true" isn't a good replacement for "not true"? A
boolean has a
single bit so bitwise negation on booleans makes sense...

>
> Also you may count table.insert(), t[#t + 1], "+" and ".."
>

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--
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Just tested:

Lua 5.3.3  Copyright (C) 1994-2016 Lua.org, PUC-Rio
; ~true
stdin:1: attempt to perform bitwise operation on a boolean value
stack traceback:
stdin:1: in main chunk
[C]: in ?
; -true
stdin:1: attempt to perform arithmetic on a boolean value
stack traceback:
stdin:1: in main chunk
[C]: in ?
; not true
false

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(that is the standard REPL, I just changed the prompt for convenient copy/paste.)
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Sent from my Game Boy.
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I meant it could be added and we'd lose a negation.

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