PyArgConstructor.h

#pragma once
// QPy - Copyright (c) 2012,2013 Ugo Varetto
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//
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#include <Python.h>

#include <QGenericReturnArgument>
#include <QMetaType>

namespace qpy {
class PyArgConstructor {
public:
    virtual PyObject* Create() const = 0;
    virtual PyObject* Create( void* ) const = 0;
    virtual ~PyArgConstructor() {}
    virtual PyArgConstructor* Clone() const = 0;
    virtual QMetaType::Type Type() const = 0;
    QGenericReturnArgument Argument() const { return ga_; }
    virtual bool IsQObjectPtr() const = 0;
protected:
    template < typename T > void SetArg( T& arg ) {
        ga_ = QReturnArgument< T >( QMetaType::typeName( Type() ), arg );
    }
private:    
    QGenericReturnArgument ga_; // not private, breaks encapsulation
};

class NoPyArgConstructor : public PyArgConstructor {
public:
    PyObject* Create( void*  ) const {
        Py_RETURN_NONE;
    }
    PyObject* Create() const {
        Py_RETURN_NONE;
    }
    NoPyArgConstructor* Clone() const {
        return new NoPyArgConstructor( *this );
    }
    QMetaType::Type Type() const { return QMetaType::Void; }
    bool IsQObjectPtr() const { return false; }
};
typedef NoPyArgConstructor NO_PY_ARG;
}