Base: fix memory leak when creating object with factory method

src/Base/BindingManager.cpp

@@ -0,0 +1,99 @@
+/***************************************************************************
+ *   Copyright (c) 2021 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_
+#include <unordered_map>
+#endif
+
+#include "BindingManager.h"
+
+using namespace Base;
+
+struct BindingManager::BindingManagerPrivate {
+    std::unordered_map<const void*, PyObject*> wrapperMapper;
+
+    bool hasWrapper(const void *cptr)
+    {
+        auto it = wrapperMapper.find(cptr);
+        return it != wrapperMapper.end();
+    }
+
+    void registerWrapper(const void* cptr, PyObject* pyObj)
+    {
+        wrapperMapper[cptr] = pyObj;
+    }
+
+    void releaseWrapper(const void* cptr, PyObject* pyObj)
+    {
+        auto it = wrapperMapper.find(cptr);
+        if (it != wrapperMapper.end() && (!pyObj || it->second == pyObj)) {
+            wrapperMapper.erase(it);
+        }
+    }
+
+    PyObject* retrieveWrapper(const void* cptr)
+    {
+        auto it = wrapperMapper.find(cptr);
+        if (it != wrapperMapper.end()) {
+            return it->second;
+        }
+
+        return nullptr;
+    }
+};
+
+BindingManager& BindingManager::instance()
+{
+    static BindingManager singleton;
+    return singleton;
+}
+
+BindingManager::BindingManager()
+    : p(new BindingManagerPrivate)
+{
+}
+
+BindingManager::~BindingManager()
+{
+}
+
+bool BindingManager::hasWrapper(const void *cptr)
+{
+    return p->hasWrapper(cptr);
+}
+
+void BindingManager::registerWrapper(const void* cptr, PyObject* pyObj)
+{
+    p->registerWrapper(cptr, pyObj);
+}
+
+void BindingManager::releaseWrapper(const void* cptr, PyObject* pyObj)
+{
+    p->releaseWrapper(cptr, pyObj);
+}
+
+PyObject* BindingManager::retrieveWrapper(const void* cptr)
+{
+    return p->retrieveWrapper(cptr);
+}