int num = 2;
vector<int*> v(16);
v.push_back(NULL);
v.push_back(&num);
v.push_back(NULL);
num = 5;
v.push_back(&num);
v.push_back(NULL);
cout << v.size() << endl;

num = 6;
v[0] = &num;
cout<< *v[0] <<endl;

v[0] = NULL;
if(v[0]){
    cout<< *v[0] <<endl;
}
/*
21
6
*/
 

對比二維陣列動態記憶體分配：

AnimationSprite** m_animalMatrix;
int animalArraySize = sizeof(AnimationSprite *) * m_width * m_height;
m_animalMatrix = (AnimationSprite **)malloc(animalArraySize);
memset((void*)m_animalMatrix, 0, animalArraySize);

當用vector儲存指標的時候，就可以像陣列一樣去使用了。