带指针成员的向量::擦除
我正在操作定义如下的对象向量：
class Hyp{
public:
int x;
int y;
double wFactor;
double hFactor;
char shapeNum;
double* visibleShape;
int xmin, xmax, ymin, ymax;
Hyp(int xx, int yy, double ww, double hh, char s): x(xx), y(yy), wFactor(ww), hFactor(hh), shapeNum(s) {visibleShape=0;shapeNum=-1;};
//Copy constructor necessary for support of vector::push_back() with visibleShape
Hyp(const Hyp &other)
{
x = other.x;
y = other.y;
wFactor = other.wFactor;
hFactor = other.hFactor;
shapeNum = other.shapeNum;
xmin = other.xmin;
xmax = other.xmax;
ymin = other.ymin;
ymax = other.ymax;
int visShapeSize = (xmax-xmin+1)*(ymax-ymin+1);
visibleShape = new double[visShapeSize];
for (int ind=0; ind<visShapeSize; ind++)
{
visibleShape[ind] = other.visibleShape[ind];
}
};
~Hyp(){delete[] visibleShape;};
};
当我创建一个 Hyp 对象时，为visibleShape分配/写入内存，并使用vector::push_back将该对象添加到向量中，一切都按预期工作：使用visibleShape指向的数据复制复制构造函数。
但是，当我使用 vector::erase 从向量中删除 Hyp 时，其他元素都会正确移动，除了指针成员visibleShape 现在指向错误的地址！如何避免这个问题呢？我错过了什么吗？
I am manipulating vectors of objects defined as follow:
class Hyp{
public:
int x;
int y;
double wFactor;
double hFactor;
char shapeNum;
double* visibleShape;
int xmin, xmax, ymin, ymax;
Hyp(int xx, int yy, double ww, double hh, char s): x(xx), y(yy), wFactor(ww), hFactor(hh), shapeNum(s) {visibleShape=0;shapeNum=-1;};
//Copy constructor necessary for support of vector::push_back() with visibleShape
Hyp(const Hyp &other)
{
x = other.x;
y = other.y;
wFactor = other.wFactor;
hFactor = other.hFactor;
shapeNum = other.shapeNum;
xmin = other.xmin;
xmax = other.xmax;
ymin = other.ymin;
ymax = other.ymax;
int visShapeSize = (xmax-xmin+1)*(ymax-ymin+1);
visibleShape = new double[visShapeSize];
for (int ind=0; ind<visShapeSize; ind++)
{
visibleShape[ind] = other.visibleShape[ind];
}
};
~Hyp(){delete[] visibleShape;};
};
When I create a Hyp object, allocate/write memory to visibleShape and add the object to a vector with vector::push_back, everything works as expected: the data pointed by visibleShape is copied using the copy-constructor.
But when I use vector::erase to remove a Hyp from the vector, the other elements are moved correctly EXCEPT the pointer members visibleShape that are now pointing to wrong addresses! How to avoid this problem? Am I missing something?
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评论（2）
我认为您缺少
Hyp的重载赋值运算符。I think you're missing an overloaded assignment operator for
Hyp.我认为您可能缺少 Hyp 类中的赋值运算符
=。Hyp&运算符 = (const Hyp&rhs);I think you might be missing the assignment operator
=in the Hyp class.Hyp& operator = (const Hyp& rhs);