Re: Does this program have the specified behavior?

Path	csiph.com!eternal-september.org!reader02.eternal-september.org!.POSTED!not-for-mail
From	Ben Bacarisse <ben.usenet@bsb.me.uk>
Newsgroups	comp.lang.c++, comp.lang.c
Subject	Re: Does this program have the specified behavior?
Date	Thu, 18 Nov 2021 11:15:41 +0000
Organization	A noiseless patient Spider
Lines	26
Message-ID	<874k89ogte.fsf@bsb.me.uk> (permalink)
References	<TeidndjwvpeU5Qn8nZ2dnUU7-QmdnZ2d@giganews.com> <2ce7a201-45d4-49aa-a512-2ca01a4fbd36n@googlegroups.com> <L6KdnUDjcci1FAn8nZ2dnUU7-V_NnZ2d@giganews.com> <536lJ.49729$JZ3.33398@fx05.iad> <dtOdnfVlRJHziwj8nZ2dnUU7-QHNnZ2d@giganews.com> <sn4s2o$tke$1@gioia.aioe.org>
Mime-Version	1.0
Content-Type	text/plain
Injection-Info	reader02.eternal-september.org; posting-host="b6e96055cde3ec5785fc7fa92034678e"; logging-data="17440"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX19boZCW4OChlEfIpxjwliQm7NgExhT9Ehk="
Cancel-Lock	sha1:cqEr/4n34vJ04aPLHDrVKfYnWlM= sha1:k5lq2NNVYd6n9KlT47I4AKMtepY=
X-BSB-Auth	1.a0ed9f7fda913165b909.20211118111541GMT.874k89ogte.fsf@bsb.me.uk
Xref	csiph.com comp.lang.c++:82378 comp.lang.c:163465

Cross-posted to 2 groups.

Show key headers only | View raw

Juha Nieminen <nospam@thanks.invalid> writes:

> In comp.lang.c++ olcott <NoOne@nowhere.com> wrote:
>>>> typedef int (*ptr)();
>>>>
>>>> int H(ptr x, ptr y)
>>>> {
>>>>     x(y); // direct execution of P(P)
>>>>     return 1;
>>>> }
>> 
>> This code does compile and run correctly.
>
> It might compile as C, but it shouldn't compile as C++, because it's trying
> to call an int(*)() with a parameter, even though that function (that the
> pointer is pointing to does not take any parameter.)

Just as it must not compile in C++, this code must compile in C.  The
meaning of empty ()s in a function declaration is different between the
two languages.

When I tidied up the code, I wrote C, not C++, because C has a more
suitable type available.

-- 
Ben.

Thread

Do this program have the specified behavior? olcott <NoOne@NoWhere.com> - 2021-11-16 21:33 -0600
  Re: Do this program have the specified behavior? wij <wyniijj@gmail.com> - 2021-11-16 20:10 -0800
    Does this program have the specified behavior? olcott <NoOne@NoWhere.com> - 2021-11-16 22:46 -0600
      Re: Does this program have the specified behavior? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-11-16 21:12 -0800
        Re: Does this program have the specified behavior? olcott <NoOne@NoWhere.com> - 2021-11-17 08:33 -0600
      Re: Does this program have the specified behavior? Richard Damon <Richard@Damon-Family.org> - 2021-11-17 06:53 -0500
        Re: Does this program have the specified behavior? olcott <NoOne@NoWhere.com> - 2021-11-17 08:49 -0600
          Re: Does this program have the specified behavior? Juha Nieminen <nospam@thanks.invalid> - 2021-11-18 06:32 +0000
            Re: Does this program have the specified behavior? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-11-18 11:15 +0000
              Re: Does this program have the specified behavior? olcott <NoOne@NoWhere.com> - 2021-11-18 08:59 -0600
            Re: Does this program have the specified behavior? olcott <NoOne@NoWhere.com> - 2021-11-18 08:58 -0600
      Re: Does this program have the specified behavior? Anurag Ranjan <anuragranjan630@gmail.com> - 2021-11-17 22:00 +0000

csiph-web