c++将数组大小扩大两倍的方法？

Question

这是我当前的代码。有没有更好的方法在 C++ 中做同样的事情？

{
            // create more room in array
            Point *temp = new Point[pointList.getSize()*ENLARGE_TIMES];

            memcpy(temp,pointList._pointList,sizeof(Point)*pointList.getSize());
            pointList.~PointList();
            pointList._pointList = temp;
            pointList.setSize(pointList.getSize()*ENLARGE_TIMES);
            pointList._pointList[iterator] = point;
            iterator++;
            pointsCounter++;

            continue;
}

编辑:不能使用 vector

Answer 1

正如 Chris 指出的那样，您真的想使用 std::vector 以及方法 reserve() 和 push_back()，如下所示:

vector<Point> pointList; // could be a member variable
pointList.reserve(INITIAL_CAPACITY); // up to you
pointList.push_back(point); // adding new elem
pointList.end();  // replaces your iterator

// Some idiomatic iteration code to go with it:
for( auto iter = begin(pointList); iter != end(pointList); ++iter )
{
  Point p = *iter; // deref iterator and use result
}