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Groups > comp.lang.c++ > #86038
| From | Keith Thompson <Keith.S.Thompson+u@gmail.com> |
|---|---|
| Newsgroups | comp.lang.c++ |
| Subject | Re: Is it possible to test if a raw pointer is pointing to a valid object? |
| Date | 2022-08-24 10:44 -0700 |
| Organization | None to speak of |
| Message-ID | <874jy1y1ss.fsf@nosuchdomain.example.com> (permalink) |
| References | <te5lf8$3camt$1@dont-email.me> <te5mrp$3ceup$1@dont-email.me> |
Paavo Helde <eesnimi@osa.pri.ee> writes:
> 24.08.2022 20:00 JiiPee kirjutas:
>> First the code. The question below it:
>> ------------------------
>> class Parent
>> {
>> public:
>> void foo2() {}
>> };
>> class Child
>> {
>> public:
>> Parent* m_parent{nullptr};
>> void foo() {
>> // can the validity of the raw pointer m_parent be checked?
>> m_parent->foo2();
>> }
>> };
>> void main()
>> {
>> Parent* parent = new Parent;
>> Child child;
>> child.m_parent = parent;
>> delete parent;
>> child.foo(); // any way this call knowing parent is now deleted?
>
> No, there isn't any way. At best you can check if a pointer points to
> memory page which is readable or writable for the process, but that
> does not help much.
There's no portable way to do even that.
[...]
> void main()
Of course main returns int, not void. (I know that was in the parent
article.)
--
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
Working, but not speaking, for Philips
void Void(void) { Void(); } /* The recursive call of the void */
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Is it possible to test if a raw pointer is pointing to a valid object? JiiPee <kerrttuPoistaTama11@gmail.com> - 2022-08-24 20:00 +0300
Re: Is it possible to test if a raw pointer is pointing to a valid object? Paavo Helde <eesnimi@osa.pri.ee> - 2022-08-24 20:24 +0300
Re: Is it possible to test if a raw pointer is pointing to a valid object? Paavo Helde <eesnimi@osa.pri.ee> - 2022-08-24 20:28 +0300
Re: Is it possible to test if a raw pointer is pointing to a valid object? JiiPee <kerrttuPoistaTama11@gmail.com> - 2022-08-24 20:39 +0300
Re: Is it possible to test if a raw pointer is pointing to a valid object? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-08-24 10:44 -0700
Re: Is it possible to test if a raw pointer is pointing to a valid object? JiiPee <kerrttuPoistaTama11@gmail.com> - 2022-08-24 20:51 +0300
Re: Is it possible to test if a raw pointer is pointing to a valid object? JiiPee <kerrttuPoistaTama11@gmail.com> - 2022-08-24 20:52 +0300
Re: Is it possible to test if a raw pointer is pointing to a valid object? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-08-24 11:59 -0700
Re: Is it possible to test if a raw pointer is pointing to a valid object? Manfred <noname@add.invalid> - 2022-08-26 02:26 +0200
Re: Is it possible to test if a raw pointer is pointing to a valid object? JiiPee <kerrttuPoistaTama11@gmail.com> - 2022-08-24 20:41 +0300
Re: Is it possible to test if a raw pointer is pointing to a valid object? Louis Krupp <lkrupp@invalid.pssw.com.invalid> - 2022-08-24 13:51 -0600
Re: Is it possible to test if a raw pointer is pointing to a valid object? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2022-08-24 12:45 -0700
Re: Is it possible to test if a raw pointer is pointing to a valid object? JiiPee <kerrttuPoistaTama11@gmail.com> - 2022-08-24 23:17 +0300
Re: Is it possible to test if a raw pointer is pointing to a valid object? scott@slp53.sl.home (Scott Lurndal) - 2022-08-24 20:54 +0000
Re: Is it possible to test if a raw pointer is pointing to a valid object? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2022-08-24 14:57 -0700
Re: Is it possible to test if a raw pointer is pointing to a valid object? Vir Campestris <vir.campestris@invalid.invalid> - 2022-08-25 12:52 +0100
Re: Is it possible to test if a raw pointer is pointing to a valid object? Sam <sam@email-scan.com> - 2022-08-24 20:21 -0400
Re: Is it possible to test if a raw pointer is pointing to a valid object? Bonita Montero <Bonita.Montero@gmail.com> - 2022-08-25 07:39 +0200
Re: Is it possible to test if a raw pointer is pointing to a valid object? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2022-08-25 03:37 -0700
Re: Is it possible to test if a raw pointer is pointing to a valid object? Sam <sam@email-scan.com> - 2022-08-25 09:37 -0400
Re: Is it possible to test if a raw pointer is pointing to a valid object? JiiPee <kerrttuPoistaTama11@gmail.com> - 2022-08-25 17:28 +0300
Re: Is it possible to test if a raw pointer is pointing to a valid object? Sam <sam@email-scan.com> - 2022-08-25 19:39 -0400
Re: Is it possible to test if a raw pointer is pointing to a valid object? Paul N <gw7rib@aol.com> - 2022-08-26 05:49 -0700
Re: Is it possible to test if a raw pointer is pointing to a valid object? JiiPee <kerrttuPoistaTama11@gmail.com> - 2022-08-26 19:35 +0300
Re: Is it possible to test if a raw pointer is pointing to a valid object? Louis Krupp <lkrupp@invalid.pssw.com.invalid> - 2022-08-26 12:25 -0600
Re: Is it possible to test if a raw pointer is pointing to a valid object? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2022-08-25 11:38 -0700
Re: Is it possible to test if a raw pointer is pointing to a valid object? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-08-26 16:08 -0500
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