Subject: Re: [Boost-users] shared_ptr and && operator
From: Kenny Riddile (kfriddile_at_[hidden])
Date: 2009-06-08 19:19:15
Robert Dailey wrote:
> On Mon, Jun 8, 2009 at 2:16 PM, Steven Watanabe <watanabesj_at_[hidden]
> <mailto:watanabesj_at_[hidden]>> wrote:
>
> AMDG
>
>
> Robert Dailey wrote:
>
> Just wondering what happens if I do this:
>
> boost::shared_ptr<Foo> foo;
> boost::shared_ptr<Bar> bar;
> if( foo && bar )
> {
> // Do stuff if both pointers are valid...
> }
>
> I did not see an overloaded && operator in the interface of the
> class. When
> using normal pointer semantics, this code is valid through implicit
> conversion of a pointer value to a boolean type.
>
>
>
> The same applies to shared_ptr.
> http://www.boost.org/libs/smart_ptr/shared_ptr.htm#conversions
>
>
> Thanks. I figured this was the case but I guess I was just having
> trouble finding the header file in which this casting operator is
> implemented. I appreciate the answers to my embarrassingly obvious question.
>
>
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Here's a short explanation why you won't find operators && or ||
overloaded very often:
http://blog.emptycrate.com/node/363
For a more thorough explanation, see chapter 7 in More Effective C++.