function return of type auto_ptr

[softwareEngineer]

Hi all,
i've a question about auto_ptr. It's correct returning an auto_ptr from function ?
Example :

<CODE>
class BookShops
{
...
std::auto_ptr<BOOK> GetBook (int book_id);
};
</CODE>

This is only a dummy example but i wold know if this is standard and if it is a
good design practice.

many thanks.

 

[gwowen]

Hi all,
i've a question about auto_ptr. It's correct returning an auto_ptr from function ?
yes

This is only a dummy example but i wold know if this is standard and if it is a
good design practice.

Good enough for Scott Meyers, which is good enough for me...
http://www.gotw.ca/publications/using_auto_ptr_effectively.htm

 

[Howard Hinnant]

Hi all,
i've a question about auto_ptr. It's correct returning an auto_ptr from function ?
Example :

<CODE>
class BookShops
{
  ...
    std::auto_ptr<BOOK> GetBook (int book_id);};

</CODE>

This is only a dummy example but i wold know if this is standard and if it is a
good design practice.

many thanks.

If you're compiler supports it, you may want to return
std::unique_ptr<BOOK> instead. This is a new replacement for auto_ptr
in C++11. std::auto_ptr is deprecated in C++11. However if your
compiler doesn't yet support unique_ptr, don't sweat it. auto_ptr
will work fine for you.

 

[SG]

Good enough for Scott Meyers, which is good enough for me...
http://www.gotw.ca/publications/using_auto_ptr_effectively.htm

This article is by Herb Sutter. ;-)

Cheers!
SG

 

[gwowen]

This article is by Herb Sutter. ;-)

It's widely known they're the same person, using two identities for
tax reasons...

[Obviously, yeah, you're right. My point still holds, I think ...]

 

[Edek]

This article is by Herb Sutter. ;-)

Now, how does that sound in the context that auto_ptr is deprecated?

 

[Alf P. Steinbach /Usenet]

* Edek, on 03.06.2011 21:45:

Now, how does that sound in the context that auto_ptr is deprecated?

Like this: use it, but don't rely on anything more than the simple ownership
semantics. In particular, don't rely on automatic conversion to pointer to base
type. This is because the deprecation means that compiler vendors (read:
Microsoft) are unlikely to fix the remaining bugs in their implementations.


Cheers & hth.,

- Alf