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Base: implement a lightweight smart pointer for PyObject like Py::Object to reduce includes of Python.h in header files

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This commit is contained in:
wmayer
2022-03-04 15:51:51 +01:00
parent 8020c1f975
commit 032cea587d
10 changed files with 219 additions and 5 deletions
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2
src/Base/CMakeLists.txt
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@@ -254,6 +254,7 @@ SET(FreeCADBase_CPP_SRCS
Rotation.cpp
RotationPyImp.cpp
Sequencer.cpp
SmartPtrPy.cpp
Stream.cpp
Swap.cpp
${SWIG_SRCS}
@@ -312,6 +313,7 @@ SET(FreeCADBase_HPP_SRCS
Reader.h
Rotation.h
Sequencer.h
SmartPtrPy.h
Stream.h
Swap.h
${SWIG_HEADERS}

119
src/Base/SmartPtrPy.cpp Normal file
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@@ -0,0 +1,119 @@
/***************************************************************************
* Copyright (c) 2020 Werner Mayer <wmayer[at]users.sourceforge.net> *
* *
* This file is part of the FreeCAD CAx development system. *
* *
* This library is free software; you can redistribute it and/or *
* modify it under the terms of the GNU Library General Public *
* License as published by the Free Software Foundation; either *
* version 2 of the License, or (at your option) any later version. *
* *
* This library is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU Library General Public License for more details. *
* *
* You should have received a copy of the GNU Library General Public *
* License along with this library; see the file COPYING.LIB. If not, *
* write to the Free Software Foundation, Inc., 59 Temple Place, *
* Suite 330, Boston, MA 02111-1307, USA *
* *
***************************************************************************/
#include "PreCompiled.h"
#ifndef _PreComp_
#endif
#include "SmartPtrPy.h"
#include <CXX/Objects.hxx>
namespace Py {
void SmartPtr::set(PyObject *pyob, bool owned)
{
release();
p = pyob;
if( !owned )
{
Py::_XINCREF( p );
}
}
void SmartPtr::release()
{
Py::_XDECREF( p );
p = nullptr;
}
SmartPtr::SmartPtr()
: p( Py::_None() )
{
Py::_XINCREF( p );
}
SmartPtr::SmartPtr( PyObject *pyob, bool owned)
: p( pyob )
{
if( !owned )
{
Py::_XINCREF( p );
}
}
SmartPtr::SmartPtr( const SmartPtr &ob )
: p( ob.p )
{
Py::_XINCREF( p );
}
SmartPtr &SmartPtr::operator=( const Object &rhs )
{
set( rhs.ptr() );
return *this;
}
SmartPtr &SmartPtr::operator=( PyObject *rhsp )
{
if( ptr() != rhsp )
set( rhsp );
return *this;
}
SmartPtr::~SmartPtr()
{
release();
}
PyObject *SmartPtr::operator*() const
{
return p;
}
PyObject *SmartPtr::ptr() const
{
return p;
}
bool SmartPtr::is( PyObject *pother ) const
{ // identity test
return p == pother;
}
bool SmartPtr::is( const SmartPtr &other ) const
{ // identity test
return p == other.p;
}
bool SmartPtr::isNull() const
{
return p == nullptr;
}
BaseExport PyObject* new_reference_to(const SmartPtr& g) {
PyObject* p = g.ptr();
Py::_XINCREF(p);
return p;
}
}

86
src/Base/SmartPtrPy.h Normal file
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@@ -0,0 +1,86 @@
/***************************************************************************
* Copyright (c) 2020 Werner Mayer <wmayer[at]users.sourceforge.net> *
* *
* This file is part of the FreeCAD CAx development system. *
* *
* This library is free software; you can redistribute it and/or *
* modify it under the terms of the GNU Library General Public *
* License as published by the Free Software Foundation; either *
* version 2 of the License, or (at your option) any later version. *
* *
* This library is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU Library General Public License for more details. *
* *
* You should have received a copy of the GNU Library General Public *
* License along with this library; see the file COPYING.LIB. If not, *
* write to the Free Software Foundation, Inc., 59 Temple Place, *
* Suite 330, Boston, MA 02111-1307, USA *
* *
***************************************************************************/
#ifndef PY_SMARTPTRPY_H
#define PY_SMARTPTRPY_H
// forward declarations
typedef struct _object PyObject;
namespace Py {
class Object;
/**
* \brief This is a stripped-down version of Py::Object.
* The purpose of this class is to avoid to include any other header file
* and therefore the PyObject is forward declared and the implementation
* is separated from the class declaration.
*
* \author Werner Mayer
*/
class BaseExport SmartPtr
{
private:
PyObject *p;
protected:
void set(PyObject *pyob, bool owned = false);
void release();
public:
SmartPtr();
// Constructor acquires new ownership of pointer unless explicitly told not to.
explicit SmartPtr(PyObject *pyob, bool owned = false);
// Copy constructor acquires new ownership of pointer
SmartPtr(const SmartPtr &ob);
// Assignment acquires new ownership of pointer
SmartPtr &operator=( const Object &SmartPtr );
SmartPtr &operator=(PyObject *rhsp);
// Destructor
virtual ~SmartPtr();
// Loaning the pointer to others, retain ownership
PyObject *operator*() const;
// Would like to call this pointer() but messes up STL in SeqBase<T>
PyObject *ptr() const;
//
// Queries
//
bool is(PyObject *pother) const;
bool is(const SmartPtr &other) const;
bool isNull() const;
};
BaseExport PyObject* new_reference_to(const SmartPtr&);
}
#endif // PY_SMARTPTRPY_H