Deleting std::vector Array in C++

Hi,

I have the following below, is this code legal? can this code can cause to some heap corruption?
The main issue here if there is a double deletion of the vector objects.
The desctructor of class dd_sample_t checks if the members are not null, if there not null it deletes them and then puts a null in them.

I'll happy to provide any other data needed.

Thanks.

At the beggining:

{
      auto_ptr<CWtSampleCtor> sample_ctor(sample_constructor);

      // construct the samples
      vector<dd_sample_t *> samples_arr;

      sample_ctor->fillSamplesArr(samples_arr);

      //send the samples, do some actions....

      sample_ctor->freeSamplesArr(samples_arr);

}

The fuction fillSamplesArr(vector<dd_sample_t *> &samples_arr):

{
...
   
m_trc_general_sample.fill(...);

m_trc_general_sample.fill(...);

...

// The definition of m_trc_general_sample is:
// dd_sample_t      m_trc_general_sample;

samples_arr.push_back(&m_trc_general_sample);

}

The function freeSamplesArr(vector<dd_sample_t *> &samples_arr):
{
      // note - avoid deleting the last m_trc_general_sample sample

      for (size_t i = 0; i < samples_arr.size() -1; ++i)
      {
            if(samples_arr/[i/] != NULL)
            {
                  delete samples_arr/[i/];
                  samples_arr/[i/] = NULL;
            }
      }
}