classes problem

mouse::mouse(){      z1=0;      speed=20;              }mouse::~mouse(){               z1=0;               }void mouse::record(){t1.push_back(0);t2.push_back(0);t3.push_back(0);doesn't work as in doesn't register inside the class, butmouse::mouse(){      z1=0;      speed=20;t1.push_back(0);t2.push_back(0);t3.push_back(0);// t1-t3 are vector<int>              }mouse::~mouse(){               z1=0;               }void mouse::record(){does work, and registers the values correctly (throws a 0) into the three fields