STL 中有 dereference_iterator 吗?

I was wondering if there is an iterator in the STL that dereferences the object pointed before returning it. This could be very useful when manipulating containers aggregating pointers. Here's an example of what I would like to be able to do:

#include <vector>
#include <iterator>
#include <algorithm>

using namespace std;

int main()
{
  vector<int*> vec;

  int i = 1;
  int j = 2;
  int k = 3;

  vec.push_back(&i);
  vec.push_back(&j);
  vec.push_back(&k);

  copy(deref_iterator(vec.begin()), 
       deref_iterator(vec.end()), 
       ostream_iterator<int>(cout, " ")); // prints "1 2 3"

  return 0;
}

推荐答案

试试 Boost 的 indirect_iterator.