getter 和 setter 的错误
我有一个顶点向量，我希望最初将 vertice.setVisit 设置为 false 或 0。我为此定义了一些 getter 和 setter，但出现了一些类型错误。代码如下：
//Vector:
std::vector<project3::Vertex<VertexType, EdgeType>*> Vertice1;
//Class containing methods:
template <class VertexType, class EdgeType> class Vertex{
protected:
//std::vector<std::pair<int, EdgeType>> VertexList;
VertexType vertice;
EdgeType edge;
int num;
int mark;
//int status=0;
public:
void setNum(int){ this.num = num; }
int getNum() { return num; }
int getMark(){ return mark; }
void setVisit(int) { this.mark = mark; }
};
在某些函数中，我将值分配给它：
for(int i=0; i<g1.Vertice1.size(); i++)
{
g1.Vertice1.at(i)->setNum(0);
g1.Vertice1.at(i)->setVisit(0);
}
下面是在函数中编译“this.mark=mark”和“this.num=num”的代码时遇到的错误类中的定义。
Error: left of '.mark' must have class/struct/union
Error: left of '.num' must have class/struct/union
这不是通过 getter 和 setter 赋值的正确方法吗？
I have a vector of vertices and I wish to set vertice.setVisit as false or 0 initially. I defined some getters and setters for this, but getting some type error. Code is as per below:
//Vector:
std::vector<project3::Vertex<VertexType, EdgeType>*> Vertice1;
//Class containing methods:
template <class VertexType, class EdgeType> class Vertex{
protected:
//std::vector<std::pair<int, EdgeType>> VertexList;
VertexType vertice;
EdgeType edge;
int num;
int mark;
//int status=0;
public:
void setNum(int){ this.num = num; }
int getNum() { return num; }
int getMark(){ return mark; }
void setVisit(int) { this.mark = mark; }
};
In some function I am assigning the values to it as :
for(int i=0; i<g1.Vertice1.size(); i++)
{
g1.Vertice1.at(i)->setNum(0);
g1.Vertice1.at(i)->setVisit(0);
}
Below is the error I am getting while compilation of the code for "this.mark=mark" and for "this.num=num" in the function definition in class.
Error: left of '.mark' must have class/struct/union
Error: left of '.num' must have class/struct/union
Isn't this the correct way to assign the values through getter and setters?
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评论（3）
在 C++ 中，
this是指针类型。尝试this->mark或(*this).mark编辑： 正如理查德在下面指出的，也请确保将您的参数命名为你正在尝试分配。在上下文中，
this->mark = mark与this->mark = this->mark相同。除非mark是一个参数，否则在这种情况下this确实没有必要。所以实际上，您可以通过执行以下操作来在示例中一起摆脱this：问候，
丹尼斯·M.
In C++,
thisis a pointer-type. Trythis->markor(*this).markEDIT: As Richard pointed out below, also be sure to name your parameters which you are trying to assign. In context,
this->mark = markis the same thing asthis->mark = this->mark. Unlessmarkis a parameter,thisis really unnecessary in this case. So realistically, you can get rid ofthisall together in your example by doing something like this:Regards,
Dennis M.
将 setNum 和 setVisit 更改为以下内容
Change setNum and setVisit to the following
this是一个指针，因此必须使用this->num。thisis a pointer, so you have to usethis->num.