vector of vector to double pointers?

Hi Guys,

It is my turn to face some problem here... The followings is my C++ code and output:

#include <iostream>
#include <vector>
#include "Layer.h"
using namespace std;

int main(int argc, char *argv[])
{
  vector<double> *iVec;
  iVec = new vector<double>;
  iVec->push_back(1.23);
  iVec->push_back(2.34);
  iVec->push_back(3.45);
  iVec->push_back(4.56);

  for (int i = 0; i < 3; ++i) {
    if (i == 0) {
      vector<Layer *> v_layer;
      vector<double> *h_output1, *h_output2;
      cout << "i == 0\n";

      h_output1 = NULL;
      v_layer.push_back(new Layer(5, &iVec, &h_output1, 1));
      cout << (*v_layer.at(0)->iVector)->size() << ":" << (*v_layer.at(0)->oVector)->size() << "\n";

      h_output2 = NULL;
      v_layer.push_back(new Layer(5, &iVec, &h_output2, 1));
      cout << (*v_layer.at(0)->iVector)->size() << ":" << (*v_layer.at(0)->oVector)->size() << "\n\n";
    }

    if (i == 1) {
      vector<Layer *> v_layer;
      vector<vector<double> *> h_output;
      cout << "i == 1\n";

      h_output.push_back(NULL);
      v_layer.push_back(new Layer(5, &iVec, &h_output.back(), 1));
      cout << (*v_layer.at(0)->iVector)->size() << ":" << (*v_layer.at(0)->oVector)->size() << "\n";

      h_output.push_back(NULL);
      v_layer.push_back(new Layer(5, &iVec, &h_output.back(), 1));
      cout << (*v_layer.at(0)->iVector)->size() << ":" << (*v_layer.at(0)->oVector)->size() << "\n\n";
    }

    if (i == 2) {
      vector<Layer *> v_layer;
      vector<double> *h_output[2];
      cout << "i == 2\n";

      h_output[0] = NULL;
      v_layer.push_back(new Layer(5, &iVec, &h_output[0], 1));
      cout << (*v_layer.at(0)->iVector)->size() << ":" << (*v_layer.at(0)->oVector)->size() << "\n";

      h_output[1] = NULL;
      v_layer.push_back(new Layer(5, &iVec, &h_output[1], 1));
      cout << (*v_layer.at(0)->iVector)->size() << ":" << (*v_layer.at(0)->oVector)->size() << "\n\n";
    }
  }
  return EXIT_SUCCESS;
}

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[slyong@localhost vault]$ ./a.out
i == 0
4:5
4:5

i == 1
4:5
4:0

i == 2
4:5
4:5

My problem is that when i == 0, I use variables of "pointer to a vector containing doubles", vector<double> *.  When i == 1, I use a vector of "pointer to a vector containing doubles", vector<vector<double> *> and when i==3, I use an array of "pointer to a vector containing doubles".  However when I use vector<vector<double> *> the result is different.

I have been scratching my head for quite a while now.. help?Start Free Trial