Subject: Re: [boost] [config] RFC PR 82
From: Domagoj Å ariÄ (dsaritz_at_[hidden])
Date: 2015-12-01 01:16:25
On Thu, 26 Nov 2015 07:43:24 +0530, AgustÃn K-ballo BergÃ©
> As for the original topic, I am certain that having the proposed macro
> would be a mistake. Don't try to fool a language/compiler smarter than
> you, or you will end up getting what you asked for (UB) sooner or later.
> If you have types whose values are comprised by just a set of bits, and
> you'd wish to operate on said value representation, then do so by using
> the tools for operating on the value representation of such trivial
> types. Type punning via unions is not that tool.
IMNHO that's just generic paranoia and refusing to even look outside the
box...we'd still be using C++98 with this kind of thinking (e.g.
Boost.Move is 'fooling' the pre-C++11 compiler just like templates weren't
originally designed as a tool for TMP or CRTP)...
Not to mention that various compilers explicitly prescribe ways to be
'fooled' (union type punning for GCC&compatibles, MSVC does not use the
aliasing rules at all - Windows wouldn't boot if it did, etc...)
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