stl-vector of pointers to elements of another vector

[Lutz Gebhardt]

Hi,

I'm trying to port a self-written C++ program to an Opteron machine with gcc
3.3.3 (SuSE Linux) in 64-bit mode. The program compiles and runs fine on SGI and
SUN machines with the respective native compilers. On the Linux machine I have
difficulties with the following piece of code (original code boiled down into a
test snippet):

#include <iostream>
#include <vector>
#include <stdlib.h>

using namespace std;

int main()
{
  std::vector<int> testlist;
  for (int i=0; i<10; i++)
    testlist.push_back(i);

  std::vector<int*> testselect;
  std::vector<int>::iterator test_itr = testlist.begin();
  while (test_itr != testlist.end())
    {
      cout << *test_itr << endl;
      if (*test_itr % 2 == 0)
        {
          cout << "Even number: " << *test_itr << endl;
          testselect.push_back(test_itr);   // **** Problem statement *****
        }
      test_itr++;
    }
}

My goal is to save pointers to selected elements from one STL-vector (testlist)
into another (testselect) for later reference. With g++ I get the following
compiler errors:

main.cpp: In function `int main()':
main.cpp:21: error: no matching function for call to `std::vector<int*, 
   std::allocator<int*> >::push_back(__gnu_cxx::__normal_iterator<int*, 
   std::vector<int, std::allocator<int> > >&)'
/usr/include/g++/bits/stl_vector.h:596: error: candidates are: void 
   std::vector<_Tp, _Alloc>::push_back(const _Tp&) [with _Tp = int*, _Alloc = 
   std::allocator<int*>]

Might this be caused by a missing implementation in the gcc-supplied STL or am I
doing something very bad here which works just by chance on the other platforms?

Any help is greatly appreciated!

Regards,
    Lutz