Re: [Boost-Users] testing if shared_ptr has been assigned

From: dick.bridges_at_[hidden]
Date: 2002-12-12 11:07:23

>From the docs:
<snippet>
get

T * get() const; // never throws
Returns: the stored pointer.

Throws: nothing.
</snippet>

Therefore you can use
      if( b.get() )
or
      if( b.get() == NULL )

                                                                                                                                      
                      "TEA Hartmann,                                                                                                  
                      Steven"                  To:      boost-users_at_[hidden]                                                   
                      <SHartmann_at_aus.t         cc:                                                                                    
                      elusa.com>               Subject: [Boost-Users] testing if shared_ptr has been assigned                         
                                                                                                                                      
                      12/11/2002 11:01                                                                                                
                      AM                                                                                                              
                      Please respond                                                                                                  
                      to Boost-Users                                                                                                  
                                                                                                                                      
                                                                                                                                      

I need some help in testing for the condition of whether a shared_ptr has
been assigned.  In the following example, the "if( b != NULL ) does not
work. How would I do this test?

typedef boost::shared_ptr<int> IPtr;

int i( 0 );
IPtr a( i );
IPtr b;

if( some condition )
             b = a;

if( b != NULL ) { // How should this really be coded?
}

Best Regards,

Steve

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