C++类定义编译问题

Question

我看了一遍,我找不到任何与我的问题有关的事情.我试图为一个多边形类编写一个类定义,该类基本上有一个包含指向点的指针的向量.当我尝试编译时,我会继续解决以下错误...

错误C2143:语法错误:缺少';' 在'<'错误之前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'向量'错误C2065:'myPolygonPoints':未声明标识符错误C2065:'points':未声明标识符错误C2065:'myHasInstersection':未声明标识符错误C2660:'Polygon :: addSetOfPoints':函数不拿一个参数

这是该类的代码

#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vector从std命名空间,而不必限定它.

您要么必须执行using namespace std;,要么使用命名空间using std::vector声明所有vector对象,std例如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;
    }

};