How to set methods like __repr__ from the C++ side?

Hm, sounds like the destructor of your wrapper has a problem , at least
that is probably what the argument frame deletes on reset...
Do you do a qRegisterMetaType in your code? Using just the register macro
is not enough...
On Thu 19. Dec 2019 at 07:10, Flower lady fancyflowerlady@users.sourceforge.net wrote:

Thanks Florian, that's very helpful! I have __iadd__, __isub__, and
__imul__ operators working, but I'm getting a heap corruption error when
trying to implement __add__, after PythonQtArgumentFrame::reset(). Any
ideas on what might be causing this? I'm returning a custom type as a
value, as such:

~~~
const Quaternion PyQuaternion::add(Quaternion * q, const Quaternion &
q2)
{
return ((*q) + q2);
}
~~~

My custom type is fairly straightforward,
~~~
class Quaternion: public Serializable {
public:

Quaternion();
Quaternion(real_g x, real_g y, real_g z, real_g w);

const Quaternion operator+(const Quaternion& q1, const Quaternion & q2)
{
return Quaternion(q1.m_x + q2.m_x, q1.m_y + q2.m_y, q1.m_z + q2.m_z,
q1.m_w + q2.m_w);
}

protected:
real_g m_x, m_y, m_z, m_w;
};
Q_DECLARE_METATYPE(Quaternion)
Q_DECLARE_METATYPE(Quaternion*)
~~~

And I register it as such:
~~~
int typeFlag = int(
PythonQt::Type_Add |
PythonQt::Type_Subtract |
PythonQt::Type_Multiply |
PythonQt::Type_InplaceAdd |
PythonQt::Type_InplaceSubtract |
PythonQt::Type_InplaceMultiply |
PythonQt::Type_RichCompare);

PythonQt::self()->priv()->registerCPPClass("Quaternion",
    "Serializable",
    "alg",
    PythonQtCreateObject<PyQuaternion>,
    NULL,
    NULL,
    typeFlag);

~~~

But calling the type via python as below causes sad times:
~~~
from PythonQt.alg import Quaternion
q = Quaternion(0.0, 0.1, 0.1, 1.0)
q2 = q * q
~~~

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How to set methods like repr from the C++ side?

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