vector 做参数有关问题

vector 做参数问题？
下面是我的程序，想在两个函数中对同一个vector 做操作，怎么老出错？？

#include <stdlib.h>
#include <afxwin.h>
#include <vector>
using namespace std;

typedef vector<CPoint> vectorPoint;

int AddPoint(vectorPoint* _setPoint)
{
_setPoint->push_back(CPoint(0,0));
_setPoint->push_back(CPoint(10,10));
_setPoint->push_back(CPoint(20,20));
_setPoint->push_back(CPoint(30,30));
_setPoint->push_back(CPoint(40,40));

return _setPoint->size();
}


int RemovePoint(vectorPoint* setPoint)
{
setPoint->erase(setPoint->end() - 1);

return setPoint->size();
}

int main()
{
vectorPoint* _setPoint = 0;

//_setPoint->clear();

int a= AddPoint(_setPoint);

int b = RemovePoint(_setPoint);

printf("%d,%d",a,b);

return 0;
}

[解决办法]
_setPoint是个指针啊。

你没有把它指向一个实际的对象啊
[解决办法]

C/C++ code

#include   <stdlib.h> #include   <vector> using   namespace   std; class Point{public:    Point(const int x, const int y)        :m_x(x), m_y(y)    {    }private:    int    m_x;    int m_y;};typedef vector<Point>vectorPoint; int   AddPoint(vectorPoint* _setPoint) {     _setPoint->push_back(Point(0,0));     _setPoint->push_back(Point(10,10));     _setPoint->push_back(Point(20,20));     _setPoint->push_back(Point(30,30));     _setPoint->push_back(Point(40,40));     return   _setPoint->size(); } int   RemovePoint(vectorPoint*   setPoint) {     setPoint->erase(setPoint->end()-1);     return setPoint-> size(); } int   main() {     vectorPoint* _setPoint = 0;     _setPoint=new vectorPoint;        //申请空间；    // _setPoint-> clear();     int   a=AddPoint(_setPoint);     int   b=RemovePoint(_setPoint);     printf("%d,%d\n",a,b);     return   0; }
[解决办法]
C/C++ code
int   main() {     //    vectorPoint*   _setPoint   =   0;     vectorPoint*   _setPoint   =   new vectorPoint();     // _setPoint-> clear();     int   a=   AddPoint(_setPoint);     int   b   =   RemovePoint(_setPoint);     printf("%d,%d",a,b);     return   0; }