C++ vector _beginthread Problem

[Bismarck_1]

#include <iostream>
#include <string>
#include <process.h>
#include <vector>

using namespace std;

class CInstanz
{
public:
    static void thread(void *dertext)
    {
        cout << endl << "Inhalt: ";
        cout << dertext << endl;
    }
};

int main()
{
    CInstanz a;
    vector<string> vTestString;
    vector<string>::iterator i;

    vTestString.push_back ("TextText");
    i = vTestString.begin();

    _beginthread(&a.thread,0,(void *)&i);

    system("PAUSE");
    return 0;
}

Wie bekomme ich statt der Adresse den Inhalt von "dertext" ausgegeben?