Cant use class in another one.

[turkertopal]

Hi all,i hope someone can figure out whats stupid with this programme.I have a class which is for point in 2D which works quite good. And i want to create another class for vectors which should use point class on it. The class i wrote:

#ifndef TVECTOR_H_
#define TVECTOR_H_

//#include <cmath>
#include <math.h>
#include "TPoint2D.h"
#define PI 3.14159265

class TVector
{
public:

                TVector();
                TVector(TPoint2D , TPoint2D );
                TPoint2D const TVector::PointA() ;
                TPoint2D const TVector::PointB() ;

 private:

                TPoint2D pointA_,pointB_;

};

TVector::TVector()
{
	TPoint2D pointA_ = TPoint2D();
	TPoint2D pointB_ = TPoint2D();
}


TVector::TVector(TPoint2D pointA, TPoint2D pointB)
{
	pointA_ = pointA;
	pointB_ = pointB;

}



TPoint2D const TVector::PointA() ;
{
	return pointA_;
}


TPoint2D const TVector::PointB() ;
{
	return pointB_;
}

#endif /*END OF TVECTOR_H_*/

And the errors i get:

TVector.h:47: error: declaration of `const TPoint2D TVector::PointA()' outside of class is not definition
TVector.h:48: error: expected unqualified-id before '{' token
TVector.h:48: error: expected `,' or `;' before '{' token
TVector.h:54: error: declaration of `const TPoint2D TVector::PointB()' outside of class is not definition
TVector.h:55: error: expected unqualified-id before '{' token
TVector.h:55: error: expected `,' or `;' before '{' token 

and here how i declare my point class:

#ifndef TPOINT2D_H_
#define TPOINT2D_H_

//#include <cmath>
#include <math.h>
#define PI 3.14159265

class TPoint2D
{
public:

               TPoint2D();
               TPoint2D(double coord1 , double coord2 );
               double Distance(TPoint2D pointA, TPoint2D pointB);
               void Topla(TPoint2D pointA, TPoint2D pointB, TPoint2D &pointC);
               double Ro(TPoint2D pointA);
               double Phi(TPoint2D TpointA);
               double  const TPoint2D::Coord1();
               double  const TPoint2D::Coord2();


 private:

               double coord1_,coord2_;

};


TPoint2D::TPoint2D()
{
              coord1_ = 0.0;
              coord2_ = 0.0;

}




TPoint2D::TPoint2D(double coord1,double coord2)
{
               coord1_ = coord1;
               coord2_ = coord2;

}




double const TPoint2D::Coord1()
{
	return coord1_;
}



double  const TPoint2D::Coord2()
{
	return coord2_;
}

Thanks in advance and sorry for wasting time

[Daved]

>> TPoint2D const TVector::PointA() ;
That semicolon shouldn't be there.

[LinuxCoder]

>> TPoint2D const TVector::PointA() ;
That semicolon shouldn't be there.

The same applies to

TPoint2D const TVector::PointB() ;

I have one question regarding those declarations. Is there any difference between:

TPoint2D const TVector::PointB()

and:

const TPoint2D TVector::PointB()

I ask this because i remember reading something about that being different when using pointers. From what i remember reading the following three declarations are all different:

const char *ptr;
char* const ptr;
const char* const ptr;

Sorry about asking this in this thread but these questions just came from the thread.

Thanks and cheers.

[turkertopal]

Thanks Daved i would spend another hour on it to realize that.

[JaWiB]

These are the same:

TPoint2D const TVector::PointB()
const TPoint2D TVector::PointB()

However this is not:

TPoint2D TVector::PointB() const

The const after the function name specifies that the function doesn't modify the calling object.

For pointers:

int foo = 0;
const int* ptr1 = &foo; //value pointed to cannot change
const int* const ptr2; //value and pointer can't change
*ptr1 = 5; //error
ptr1 = ptr2; //ok
ptr2 = ptr1; //error