using custom datatypes with QVariant/Q_DECLARE_METATYPE();

[SK.]

Hello everyone,
I want to use a custom data type with QVariant, specifically I want to push_back a "Vector3" class instance onto a QVector<QVariant>. I already searched the forums and found some helpful information ( for example http://www.qtcentre.org/forum/f-qt-p...types-146.html ), but somehow it doesn´t work the way it should.

my "Vector3" class:

#ifndef __VECTOR3_H_
#define __VECTOR3_H_
 
#include <QMetaType>
 
class Vector3
{
 
public:
  Vector3(): x(0), y(0), z(0) {};
 
  Vector3(float inX, float inY , float inZ) : x (inX), y (inY), z (inZ) {};
 
 
  Vector3::Vector3(const Vector3 &vector3) {
    x=vector3.getX();
    y=vector3.getY();
    z=vector3.getZ();
  }
 
[...]
 
private:
  float x;
  float y;
  float z;
 
};
 
Q_DECLARE_METATYPE(Vector3);
 
#endif //__VECTOR3_H_

#ifndef __VECTOR3_H_
#define __VECTOR3_H_

#include <QMetaType>

class Vector3
{
  
public:
  Vector3(): x(0), y(0), z(0) {};

  Vector3(float inX, float inY , float inZ) : x (inX), y (inY), z (inZ) {};

 
  Vector3::Vector3(const Vector3 &vector3) {
    x=vector3.getX();
    y=vector3.getY();
    z=vector3.getZ();
  }

[...]

private:
  float x;
  float y;
  float z;

};

Q_DECLARE_METATYPE(Vector3);

#endif //__VECTOR3_H_

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I try to use it that way (parameters is: QVector<QVariant> parameters; ):

Vector3 test;
parameters.push_back(test);

Vector3 test;
parameters.push_back(test);

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Which results in the following:

.\view\Drawing.cpp(20) : error C2664: 'QVector<T>:ush_back' : cannot convert parameter 1 from 'Vector3' to 'const QVariant &'
with
[
T=QVariant
]
Reason: cannot convert from 'Vector3' to 'const QVariant'
No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called

Now my naive understanding was that I´d only have to Q_DECLARE_METATYPE(Vector3) and everything would work, but that´s obviously wrong. A few pointers in the right direction would be greatly appreciated.