LinuxQuestions.org - Class problems

These classes are published classes, simply I am using them now, but cannot even get them to compile. So for example I get the following errors relating to member functions not being found. I have simplified the code such that one can see the point of failure. Does anyone know what is happening here to cause the failure.

Code:

Code:

Edge.cpp

========





#include "Point.h"

#include "Edge.h"





Edge::Edge(Point &_org, Point &_dest) :

 org(_org), dest(_dest)

{

}



/*Edge::Edge(void) :

  org(Point(0,0)), org(Point(1,0))

 {

 }

*/





Edge &Edge::rot(void)

{

  Point m; 

  m = 0.5 * (org + dest);

  Point v = dest - org;

  Point n(v.y, -v.x);

  org = m - 0.5 * n;

  dest = m + 0.5 * n;

  return *this;

}







Edge.h file

========







class Point;



class Edge {

 public:

  Point org;

  Point dest;

  Edge(Point &_org, Point &_dest);

  Edge(void);

  Edge &rot(void);

  //Edge &flip(void);

  //Point point(double);

  //int intersect(Edge&, double&);

  //int cross(Edge&, double&);

  //bool isVertical(void);

  //double slope(void);

  //double y(double);

 };





Point.cpp

========







#include "Point.h"



Point::Point(double _x, double _y):

x(_x), y(_y)

{

}



Point Point::operator+(Point &p)

{

  return Point(x+p.x, y+p.y);

}



Point Point::operator-(Point &p)

{

  return Point(x - p.x, y-p.y);

}



Point operator*(double s, Point &p)

{

  return Point(s *p.x, s *p.y);

}



double Point::operator[](int i)

{

  return (i ==0) ? x : y;

}



int Point::operator==(Point &p)

{

  return (x == p.x) && (y == p.y);

}



int Point::operator!=(Point &p)

{

  return !(*this == p);

}



int Point::operator<(Point &p)

{

  return ((x < p.x) || ((x == p.x) && (y < p.y)));

}



int Point::operator>(Point &p)

{

  return ((x > p.x) || ((x == p.x) && (y > p.y)));

}





/*int main(void)

{



return (0);

}*/







Point.h

========



class Point{

public:

  double x;

  double y;

  Point(double _x = 0.0, double _y = 0.0);

  Point operator+(Point&);

  Point operator-(Point&);

  friend Point operator*(double, Point&);

  double operator[](int);

  int operator==(Point&);

  int operator!=(Point&);

  int operator<(Point&);

  int operator>(Point&);

  int classify(Point&, Point&);

  //int classify(Edge&);

  double polarAngle(void);

  double length(void);

  //double distance(Edge&);

};



Error on compilation.

============



g++ -c Edge.cpp -o Edge.o

Edge.cpp: In member function ‘Edge& Edge::rot()’:

Edge.cpp:20: error: no match for ‘operator*’ in ‘5.0e-1 * ((Edge*)this)->Edge:rg. Point:perator+(((Point&)(&((Edge*)this)->Edge::dest)))’

Point.h:10: note: candidates are: Point operator*(double, Point&)

Edge.cpp:23: error: no match for ‘operator-’ in ‘m - operator*(5.0e-1, ((Point&)(& n)))’

Point.h:9: note: candidates are: Point Point:perator-(Point&)

Edge.cpp:24: error: no match for ‘operator+’ in ‘m + operator*(5.0e-1, ((Point&)(& n)))’

Point.h:8: note: candidates are: Point Point:perator+(Point&)



Code:



The Makefile is as follows:





all: Poly

        

Poly:    Point.o Edge.o Polygons.o 



        g++  -o Poly Point.o Edge.o Polygons.o



Point.o: Point.cpp

        g++    -c Point.cpp -o Point.o        



Edge.o: Edge.cpp

        g++    -c Edge.cpp -o Edge.o        

        

Polygons.o: Polygons.cpp

        g++    -c Polygons.cpp -o Polygons.o



clean:

        find . -name '*.o' | xargs rm -f ;

Thanks