Re: [Boost-users] null_ptr?

From: Victor A. Wagner Jr. (vawjr_at_[hidden])
Date: 2008-01-02 19:40:56

Robert Dailey wrote:
> Hi,
>
> Does boost have some sort of null_ptr class that allows you to do 
> portable NULL comparisons? For example, the following isn't portable:
>
> char* foo = 0;
> if( foo != 0 )
> {
> }
 if (foo)
 {
 }
should be portable also
>
> But this is portable:
>
> char* foo = reinterpret_cast<char*>( 0 );
> if( foo != reinterpret_cast<char*>( 0 ) )
> {
> }
>
> You could easily create a null_ptr class with a few global template 
> operators to make this easy, so you could do this:
I understand there are enough people who dislike   if (foo)  and   
if(!foo) that adding a "null" is going into c+0x
I personally like the   (foo) and (!foo) notation and think "needing" a 
"NULL" is pointless given the other holes in the language

>
> char* foo = boost::null_ptr;
> if( foo != boost::null_ptr )
> {
> }
>
> Is there such a thing? Thanks.
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>
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