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Seraphim_zhai
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 Posted: Wed Nov 30, 2005 1:47 am Post subject: Re: Can the protected destructor not be virtual? |
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the protected base destructor is to say that the derived object should not
be delete from the pointer or reference of base class. It should be explicit
deleted.
"Seraphim_zhai" <zqfstone (AT) yahoo (DOT) com.cn> 写入消息新闻:dmiuq1$oa3$1 (AT) news (DOT) yaako.com...
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mlimber
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| Posted: Wed Nov 30, 2005 1:12 pm Post subject: Re: Can the protected destructor not be virtual? |
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Seraphim_zhai wrote:
| Quote: | the protected base destructor is to say that the derived object should not
be delete from the pointer or reference of base class. It should be explicit
deleted.
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A protected destructor can be non-virtual, and in fact, that is often
the case for policy classes. Non-friend clients then can't delete the
object by that pointer accidentally, but a friend, the class itself, or
subclasses could still delete it inappropriately:
class Policy { protected: ~Policy() {} };
class A : public Policy
{
Foo() { delete static_cast<Policy*>( this ); } // Yikes!
};
Committing suicide by deleting [this] is rarely used in my experience,
but it is legal
([url]http://www.parashift.com/c++-faq-lite/freestore-mgmt.html#faq-16.15)[/url].
Cheers! --M
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