c++:在main方法中运行函数

我是C++新手，试图弄清楚一些事情。我面临且不确定的问题之一是从main（）方法调用函数时收到的超出范围的错误：

User@PC /cygdrive/c/Documents and Settings/---/folder
$ g++ test.cpp
test.cpp: In function ‘int main()’:
test.cpp:90:9: error: ‘test01’ was not declared in this scope
  test01();

测试的代码.cpp如下。

#include <iostream>
#include <string>
#include <vector>
using namespace std;
class stringStuff {
    vector<string>* elements;
    int frontItem;
    int rearSpace;
    int upperBound;
    public: 
        stringStuff(int capacity) {
            vector<string>* elements = new vector<string>(2*capacity);
            frontItem = capacity;
            rearSpace = capacity;
            upperBound = 2 * capacity;
        }
        virtual void test01(){
            stringStuff* sd = new stringStuff(100); 
            // test code here
        }
};
/** Driver
 */
int main() {
    test01();
}

我在这里做错了什么？