C++类定义编译问题

Question

我找遍了所有地方，但找不到与我的问题相关的任何内容。我正在尝试为一个多边形类编写一个类定义，该多边形类基本上具有一个包含指向某个点的指针的 vector 。当我尝试编译时，我不断收到以下错误...

错误 C2143:语法错误:缺少“；”在“<”之前错误 C4430:缺少类型说明符 - 假定为 int。错误 C2238:“;”之前的意外标记错误 C2061:语法错误:标识符“vector ”错误 C2065:“myPolygonPoints”:未声明的标识符错误 C2065:“点”:未声明的标识符错误 C2065:“myHasInstersection”:未声明的标识符错误 C2660:“Polygon::addSetOfPoints”:函数不接受 1 个参数

这是类的代码

#include "Point.h"
#include <vector>

class Point;

class Polygon
{
private:
    vector<Point*> myPolygonPoints;
    bool myHasIntersection;

public:
    void addSetOfPoints(vector<Point*> points)
    {
        myPolygonPoints = points;
    }

    bool getHasIntersection()
    {
        return myHasIntersection;
    }

    void setHasIntersection(bool intersection)
    {
        myHasInstersection = intersection;
    }

};

Answer 1

您正在使用 std 命名空间中的 vector 而未对其进行限定。

您要么必须using namespace std;，要么using std::vector，或者用std 命名空间，如 std::vector。

#include "Point.h"
#include <vector>

class Point; // Assuming Point.h has this declared,
             // you don't need this forward declaration, but in reality,
             // you don't need to include Point.h
             // since you're only declaring pointers to Points

class Polygon
{
private:
    std::vector<Point*> myPolygonPoints;
    bool myHasIntersection;

public:
    void addSetOfPoints(std::vector<Point*> points)
    {
        myPolygonPoints = points;
    }

    bool getHasIntersection()
    {
        return myHasIntersection;
    }

    void setHasIntersection(bool intersection)
    {
        myHasInstersection = intersection;
    }

};