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

src/Base/SmartPtrPy.cpp

@@ -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;
+    }
+}