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/*
* This source file is part of libRocket, the HTML/CSS Interface Middleware
*
* For the latest information, see http://www.librocket.com
*
* Copyright (c) 2008-2010 CodePoint Ltd, Shift Technology Ltd
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
*/
#if !defined(BOOST_PP_IS_ITERATING)
# error PyWrapperIter - do not include this file!
#endif
#define N BOOST_PP_ITERATION()
/**
Generic Python Wrapper, using Boost Preprocessor Iteration to Generate Variants
Relies on a Rocket::Core::ReferenceCountable base class for reference counting.
Traps ReferenceActivated/Deactivated calls and makes them behave like
they should for python based objects.
@author Lloyd Weehuizen
*/
#define WRAPPER_PARAM(x, n, d) , d
template < typename T BOOST_PP_COMMA_IF(N) BOOST_PP_ENUM_PARAMS_Z(1, N, typename A) >
class Wrapper< T BOOST_PP_COMMA_IF(N) BOOST_PP_ENUM_PARAMS_Z(1, N, A) BOOST_PP_REPEAT_1( BOOST_PP_SUB(BOOST_PP_INC(WRAPPER_MAX_ARGS), N), WRAPPER_PARAM, WrapperNone) > : public T
{
public:
Wrapper(PyObject* self BOOST_PP_COMMA_IF(N) BOOST_PP_ENUM_BINARY_PARAMS_Z(1, N, A, a)) : T(BOOST_PP_ENUM_PARAMS_Z(1, N, a))
{
// Set self to NULL, so we can trap the reference deactivated and not pass it down
this->self = NULL;
// We have to remove the C++ reference count that all C++ objects start with here,
// otherwise if an object is created in python and destroyed by python, the C++ ref count will
// remain 1. The PyWrapperInstancer will increase the refcount again, to ensure a correct refcount
// if the object was created by C++
T::RemoveReference();
// If the C++ reference count is not 0 at this point, it means additional references have been added
// during the classes constructor. We have to propogate these references into python.
for (int i = 0; i < this->T::GetReferenceCount(); i++)
Py_INCREF(self);
// Store self
this->self = self;
}
Wrapper(PyObject* self, const T& other) : T(other)
{
this->self = self;
}
virtual ~Wrapper()
{
// We should only be deleted when python says the refcnt is 0, if we
// are being deleted prematurely, something is wrong!
ROCKET_ASSERTMSG(self->ob_refcnt == 0, "Python object being cleared up prematurely, reference count not 0.");
ROCKET_ASSERT(this->T::GetReferenceCount() == 0);
}
/// Override AddReference so we can push the call through to python
virtual void AddReference()
{
Py_INCREF(self);
T::AddReference();
}
/// Overrride RemoveReference so we can push the call through to python
virtual void RemoveReference()
{
T::RemoveReference();
Py_DECREF(self);
}
virtual int GetReferenceCount()
{
// C++ reference counts are always reflected in the python ref count
return self->ob_refcnt;
}
virtual void OnReferenceDeactivate()
{
// If self is NULL, don't pass the call down, as this is the initial
// T::RemoveReference from the constructor
if (self)
T::OnReferenceDeactivate();
}
// Script object access
virtual void* GetScriptObject() const { return self; }
protected:
PyObject* self;
};
#undef WRAPPER_PARAM
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