Re: correct way to create dynamically function pointers

From	Ben Bacarisse <ben.usenet@bsb.me.uk>
Newsgroups	comp.lang.c
Subject	Re: correct way to create dynamically function pointers
Date	2017-04-11 19:06 +0100
Organization	A noiseless patient Spider
Message-ID	<87tw5urf7h.fsf@bsb.me.uk> (permalink)
References	<b6cbce81-b326-4c26-9079-23e083b2de56@googlegroups.com> <vs8HA.4$eU.3@fx14.iad> <8dfc1237-0a3b-4cc5-bac9-403a0ccff2a7@googlegroups.com>

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Hello World <acidlategamer@gmail.com> writes:

> On Tuesday, April 11, 2017 at 11:04:27 PM UTC+5:30, Scott Lurndal wrote:
>> Hello World <acidlategamer@gmail.com> writes:
>> >Hi all,=20
>> >
>> >I am learning C but I don't understand certain topics with much clarity.
>> >I came to know that normally it is better to use dynamic memory allocation,=
>> > so I tried to make a c program that will dynamically allocate memory for f=
>> >unction pointers. I wrote this
>> >
>> 
>> >However I get an error
>> >
>> >warning: ISO C forbids assignment between function pointer and =E2=80=98voi=
>> >d *=E2=80=99 [-Wpedantic]
>> >  p =3D malloc(sizeof(p)*4);
>> >    ^
>> >
>> 
>> ISO C forbids that because on some architectures, a function pointer
>> may require more bits than a void pointer contains.[*]
>> 
>> 
>> >What am I missing?
>> 
>> a cast.  (puts on flameproof suit).
>> 
>> [*] On one segmented architecture I used to use, a function pointer required 10-bytes,
>>     whereas a data pointer was 4-bytes.
>
> As far as I know pointer variable have same size in an architecure.

Please don't get distracted by this.  It makes no difference how large
the pointers are -- you just have a pointer of the wrong type.  See my
other reply to you.

-- 
Ben.

Thread

correct way to create dynamically function pointers Hello World <acidlategamer@gmail.com> - 2017-04-11 10:20 -0700
  Re: correct way to create dynamically function pointers scott@slp53.sl.home (Scott Lurndal) - 2017-04-11 17:34 +0000
    Re: correct way to create dynamically function pointers Hello World <acidlategamer@gmail.com> - 2017-04-11 10:42 -0700
      Re: correct way to create dynamically function pointers scott@slp53.sl.home (Scott Lurndal) - 2017-04-11 17:48 +0000
        Re: correct way to create dynamically function pointers Hello World <acidlategamer@gmail.com> - 2017-04-11 10:55 -0700
      Re: correct way to create dynamically function pointers Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-04-11 19:06 +0100
      Re: correct way to create dynamically function pointers "James R. Kuyper" <jameskuyper@verizon.net> - 2017-04-11 14:23 -0400
    Re: correct way to create dynamically function pointers Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-04-11 19:05 +0100
    Re: correct way to create dynamically function pointers "James R. Kuyper" <jameskuyper@verizon.net> - 2017-04-11 14:11 -0400
      Re: correct way to create dynamically function pointers Richard Heathfield <rjh@cpax.org.uk> - 2017-04-12 08:27 +0100
        Re: correct way to create dynamically function pointers "James R. Kuyper" <jameskuyper@verizon.net> - 2017-04-12 13:31 -0400
          Re: correct way to create dynamically function pointers Richard Heathfield <rjh@cpax.org.uk> - 2017-04-12 23:05 +0100
  Re: correct way to create dynamically function pointers Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-04-11 19:03 +0100
  Re: correct way to create dynamically function pointers "James R. Kuyper" <jameskuyper@verizon.net> - 2017-04-11 14:05 -0400
    Re: correct way to create dynamically function pointers Jorgen Grahn <grahn+nntp@snipabacken.se> - 2017-04-15 10:19 +0000
      Re: correct way to create dynamically function pointers asetofsymbols@gmail.com - 2017-04-15 05:09 -0700
  Re: correct way to create dynamically function pointers Barry Schwarz <schwarzb@dqel.com> - 2017-04-11 15:13 -0700
    Re: correct way to create dynamically function pointers Richard Heathfield <rjh@cpax.org.uk> - 2017-04-12 08:28 +0100
  Re: correct way to create dynamically function pointers Richard Heathfield <rjh@cpax.org.uk> - 2017-04-12 08:19 +0100
    Re: correct way to create dynamically function pointers Spiros Bousbouras <spibou@gmail.com> - 2017-04-12 21:17 +0000
      Re: correct way to create dynamically function pointers Richard Heathfield <rjh@cpax.org.uk> - 2017-04-12 23:11 +0100
        Re: correct way to create dynamically function pointers Keith Thompson <kst-u@mib.org> - 2017-04-12 16:36 -0700
  Re: correct way to create dynamically function pointers John Bode <jfbode1029@gmail.com> - 2017-04-12 10:04 -0700
    Re: correct way to create dynamically function pointers Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-04-12 19:28 +0100
    Re: correct way to create dynamically function pointers Tim Rentsch <txr@alumni.caltech.edu> - 2017-04-17 05:50 -0700

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