From: Florian Weimer <fweimer@redhat.com>
To: Pedro Alves <pedro@palves.net>
Cc: gdb@sourceware.org, "Zaric, Zoran (Zare)" <Zoran.Zaric@amd.com>
Subject: Re: gmp's c++ interface / mpz_class
Date: Wed, 19 Oct 2022 12:28:53 +0200 [thread overview]
Message-ID: <87lepcgl96.fsf@oldenburg.str.redhat.com> (raw)
In-Reply-To: <f2bb71e9-2ac1-1540-5d94-6807c540b23e@palves.net> (Pedro Alves's message of "Fri, 14 Oct 2022 21:42:10 +0100")
* Pedro Alves:
> Hmm. Since we don't need infinite precision, it will end up a lot
> more efficient to roll our own type, with fixed (or templated) storage
> size. Like a simplified version of GCC's wide_int. Not sure yet
> whether efficiency really matters in practice, but I suspect it does.
>
> I'd still be curious about GMP's native C++ interface.
I tried to use it recently in a hobby project, but it turned out to be a
poor fit because it's not integrated well with C++11 and later features
(no move constructors, no rvalue references). The unconditional use of
malloc is rather off-putting, too.
I'm contemplating to use tagged integers/pointers as the main
representation, with heap allocation only on demand, maybe using the the
mpn* functions directly, or perhaps copy things out of a long-lasting
mpz_t object that's used as a temporary for arithmetic.
For 72-bit integers, that seems a bit over the top, though.
Thanks,
Florian
next prev parent reply other threads:[~2022-10-19 10:29 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-14 18:11 Pedro Alves
2022-10-14 20:42 ` Pedro Alves
2022-10-19 10:28 ` Florian Weimer [this message]
2022-10-17 10:44 ` Luis Machado
2022-10-17 11:29 ` Pedro Alves
2022-10-17 17:21 ` Tom Tromey
2022-10-24 13:34 ` Joel Brobecker
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