//entity.h
#ifndef _ENTITY_H
#define _ENTITY_H

#include "vector.h"

namespace VR
{

	template <class T>
	class Entity
	{
		public:
			Entity(T intiX, T initY, T initXSpeed, T initYSpeed);
			Entity(Vector<T> initPosition, Vector<T> initSpeed);
			~Entity();

			void accelerate(Vector<T> acc);
			void step();

			const Vector<T> getPosition();
			const Vector<T> getSpeed();

		private:
			Entity();
			void accelerate(Vector<T> acc);
			void step();

			Vector<T> position, speed;
	};

	template <class T>
	Entity<T>::Entity()
	{
	}

	template <class T>
	Entity<T>::Entity(T initX, T initY, T initXSpeed, T initYSpeed)
	:position(Vector<T>(initX, initY)), speed(Vector<T>(initXSpeed, initYSpeed))
	{
	}

	template <class T>
	Entity<T>::Entity(Vector<T> initPosition, Vector<T> initSpeed)
	:position(initPosition), speed(initSpeed)
	{
	}

	template <class T>
	Entity<T>::~Entity()
	{
	}

	template <class T>
	void Entity<T>::accelerate(Vector<T> acc) //hier meckert er (fehler genauer weiter unten)
	{
		speed += acc;
	}

	template <class T>
	void Entity<T>::step() //und hier meckert er (fehler genauer weiter unten)
	{
		position += speed;
	}

	template <class T>
	const Vector<T> Entity<T>::getPosition()
	{
		return position;
	}

	template <class T>
	const Vector<T> Entity<T>::getSpeed()
	{
		return speed;
	}
}

//vector.h
#ifndef _VECTOR_H
#define _VECTOR_H

#include "coordinate.h"

namespace VR
{

	template <class T>
	class Vector : public Coordinate<T>
	{
		public:
			Vector();
			Vector(T initX, T initY);
			~Vector();

			void operator+=(Coordinate<T> aCoordinate);

			void addX(T aX);
			void addY(T aY);
			void add(T aX, T aY);
	};

	template <class T>
	Vector<T> ::Vector()
	{
	}

	template <class T>
	Vector<T>::Vector(T initX, T initY)
	{
		Coordinate<T>::x = initX;
		Coordinate<T>::y = initY;
	}

	template <class T>
	Vector<T>::~Vector()
	{
	}

	template <class T>
	void Vector<T>::operator+=(Coordinate<T> aCoordinate)
	{
		Coordinate<T>::x += aCoordinate[0];
		Coordinate<T>::y += aCoordinate[1];
	}

	template <class T>
	void Vector<T>::addX(T aX)
	{
		setX(Coordinate<T>::getX() + aX);
	}

	template <class T>
	void Vector<T>::addY(T aY)
	{
		setY(Coordinate<T>::getY() + aY);
	}

	template <class T>
	void Vector<T>::add(T aX, T aY)
	{
		addX(aX);
		addY(aY);
	}

}

#endif

//coordinate.h
#ifndef _COORDINATE_H
#define _COORDINATE_H

#include <stdexcept>
#include <iostream>

namespace VR
{

	template <class T>
	class Coordinate
	{
		public:
			Coordinate();
			Coordinate(T initX, T initY);
			~Coordinate();

			T& operator[](int index);
		protected:
			T x, y;
	};

	template <class T>
	Coordinate<T>::Coordinate()
	{
	}

	template <class T>
	Coordinate<T>::Coordinate(T initX, T initY)
	:x(initX), y(initY)
	{
	}

	template <class T>
	Coordinate<T>::~Coordinate()
	{
	}

	template <class T>
	T& Coordinate<T>::operator[](int index)
	{
		if (index == 0)
			return x;
		if (index == 1)
			return y;
		else
			throw "out of range in a Coordinate or a erived class";
	}

}

#endif

//main.cc
#include <iostream>
#include "../include/entity.h"
#include "../include/vector.h"
#include "../include/fair_container.h"
int main()
{
	VR::Entity<float> a(1,2,3, 4), b(5,6,7,8);

	std::cout << a.getPosition()[0] << ' ' << a.getPosition()[1] << std::endl;

	return 0;
}

Fehler:

../include/entity.h:62: error: ‘void VR::Entity<T>::accelerate(VR::Vector<T>) [with T = int]’ cannot be overloaded
../include/entity.h:25: error: with ‘void VR::Entity<T>::accelerate(VR::Vector<T>) [with T = int]’
../include/entity.h:68: error: ‘void VR::Entity<T>::step() [with T = int]’ cannot be overloaded
../include/entity.h:26: error: with ‘void VR::Entity<T>::step() [with T = int]’

wenn ich einfach zwei int-vectoren anlegen und dies mit += addiere funktionier t alles:

#include <iostream>
#include "../include/entity.h"
#include "../include/vector.h"
#include "../include/fair_container.h"
int main()
{
	VR::Vector<int> a(1,2), b(3,4);

	a += b;

	std::cout << a[0] << ' ' << a[1] << std::endl;

	return 0;
}

Ausgabe damit:

EXECUTING:
/home/mambokurt/Projects/VectorRace/src/vectorrace 
----------------------------------------------
4 6

----------------------------------------------
Program exited successfully with errcode (0)
Press the Enter key to close this terminal ...

was bedeutet das? wie bekomme ich das geregelt?

[Edit]
das scheint also irgendwie an den namen zu liegen.
wenn ich die beiden methoden umbenenne - zB in kop und musch - dann kompiliert er ohne probleme.
wenn ich jetzt noch wüsste, warum er step() und accelerate() als namen nicht annimmet, dann wäre ich ein glücklicher mann.
[/Edit]

mfG MamboKurt