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From: Keith Thompson <kst-u@mib.org>
Newsgroups: comp.lang.c,comp.lang.c++
Subject: Re: Range-aware modulo operator -%
Date: Mon, 31 Dec 2018 16:44:35 -0800
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Bart <bc@freeuk.com> writes:
[...]
> If you write if(x), while(x), or for(;x;), then it automatically applies 
> the effective equivalent of !! to give a true (x!=0) or false (x==0) 
> result. (The same with (x && y) and any such combinations.)
[...]

That's one way to describe it.  It's now how the standard describes it.

For example, the description of the "if" statement says "the first
substatement is executed if the expression compares unequal to 0",
which I find clearer and simpler than your reformulation.

-- 
Keith Thompson (The_Other_Keith) kst@mib.org  <http://www.ghoti.net/~kst>
Will write code for food.
"We must do something.  This is something.  Therefore, we must do this."
    -- Antony Jay and Jonathan Lynn, "Yes Minister"