the begginning

versioning/BRM/undoable.cpp

@@ -0,0 +1,69 @@
+/* Copyright (C) 2014 InfiniDB, Inc.
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License
+   as published by the Free Software Foundation; version 2 of
+   the License.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+   MA 02110-1301, USA. */
+
+/*****************************************************************************
+ * $Id: undoable.cpp 1823 2013-01-21 14:13:09Z rdempsey $
+ *
+ ****************************************************************************/
+
+#include <stdexcept>
+
+#define UNDOABLE_DLLEXPORT
+#include "undoable.h"
+#undef UNDOABLE_DLLEXPORT
+
+using namespace std;
+
+namespace BRM {
+
+Undoable::Undoable()
+{
+}
+
+Undoable::~Undoable() 
+{
+}
+
+inline void Undoable::makeUndoRecord(void *start, int size)
+{
+	ImageDelta d;
+
+	if (size > ID_MAXSIZE)
+		throw overflow_error("Undoable::makeUndoRecord(): size > max");
+
+	d.start = start;
+	d.size = size;
+	memcpy(d.data, start, size);
+ 	undoRecords.push_back(d);
+}
+
+void Undoable::undoChanges()
+{
+	vector<ImageDelta>::reverse_iterator it;
+
+	for (it = undoRecords.rbegin(); it != undoRecords.rend(); it++)
+		memcpy((*it).start, (*it).data, (*it).size);
+
+	undoRecords.clear();
+}
+
+void Undoable::confirmChanges()
+{
+	undoRecords.clear();
+}
+
+}