删除 vector / list 中所有指针元素

高级写法：

 std::list<T*> list_pts;
 while (!list_pts.empty()) {
   delete list_pts.front(),list_pts.pop_front();
 }
 
 std::vector<T*> vector_pts;
 while (!vector_pts.empty()) {
   delete vector_pts.back(),vector_pts.pop_back();
 }
 
//wrap into a function:
template<typename Container>
void DeleteAllPointers (Container& container) {
  while (!container.empty()) {
    delete container.back(),container.pop_back();
  }
}

通俗写法：

std::list<T*> list_pts;
for (list<T*>::const_iterator itr=list_pts.begin(); itr!=list_pts.end(); ++itr) {
  delete *itr;
}
list_pts.clear();