Re: [Boost-users] boost-users [shared_array] comparing the value.

From: Michael Linck (mgl_at_[hidden])
Date: 2007-10-25 17:35:22

The boost documentation states that the == operator "Compares the stored
pointers of the two smart pointers." The phrase "smart pointers" refers
to the shared arrays themselves, because that's really all a shared
array *is.*  So the operation described above is actually equivalent to
what you outlined in item 2. of answering your own question.

mike

On Thu, 2007-10-25 at 11:22 -0700, chun ping wang wrote:
> Hi I notice boost shared_array compares the pointer address not the
> pointer themselves. What would be the best way to compare the actual
> value of boost shared_array. 
> 
> 1.)
> shared_array<T> a;
> shared_array<T> b; 
> 
> 
> 1.) return (a.len == b.len && (memcmp(a, b, len) == 0));
> 
> or 
> 
> 2.) 
> if (a.len != b.len)
>      return false;
> for (ptrdiff_t i  = 0; i != a.len; ++i)
>    if(a[i] != b[i])
>       return false; 
> 
> One that works ALL the times. 
> 
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