Re: [boost] Potential scoped_ptr improvement

Subject: Re: [boost] Potential scoped_ptr improvement
From: Dave Abrahams (dave_at_[hidden])
Date: 2010-09-30 00:10:09

On Wed, Sep 29, 2010 at 9:53 PM, Steven Watanabe <watanabesj_at_[hidden]> wrote:
> On 9/29/2010 6:01 PM, David Abrahams wrote:
>>
>> The incantation
>>
>>     scoped_ptr<Base>  x( new Derived );
>>
>> will succeed and produce undefined behavior upon x's destruction unless
>> Derived has a trivial or virtual d'tor.
>>
>> It would be pretty easy to prevent something like that from compiling
>> when has_virtual_destructor<Base>::value is false.  Thoughts?
>
> You just need to be careful only to use has_virtual_destructor
> when there's compiler support, since the implementation falls
> back on always returning false.

If there's no support, we should fall back to using is_polymorphic.

-- 
Dave Abrahams
BoostPro Computing
http://www.boostpro.com