Re: [Boost-users] shared_ptr and && operator

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++.