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

25 Oct 2007


      It should be intelligent enough to deal with that.

mike

On Thu, 2007-10-25 at 15:01 -0700, chun ping wang wrote:
...
hmm the thing is it compares all the array. And len might not be the
actual size of the array.
Example you cna have array X.
x[0] = 25
x[1] = 12
x[2] = null
x[3] = null
On 10/25/07, Michael Linck  wrote: 
        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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        > Boost-users@lists.boost.org
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