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diff --git a/sc/inc/columnspanset.hxx b/sc/inc/columnspanset.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef SC_COLUMNSPANSET_HXX
+#define SC_COLUMNSPANSET_HXX
+
+#include "address.hxx"
+
+#include <vector>
+#include <mdds/flat_segment_tree.hpp>
+#include <boost/noncopyable.hpp>
+
+namespace sc {
+
+/**
+ * Structure that stores segments of boolean flags per column, and perform
+ * custom action on those segments.
+ */
+class ColumnSpanSet : boost::noncopyable
+{
+ typedef mdds::flat_segment_tree<SCROW, bool> ColumnSpansType;
+ typedef std::vector<ColumnSpansType*> TableType;
+ typedef std::vector<TableType*> DocType;
+
+ DocType maDoc;
+
+public:
+ class Action
+ {
+ public:
+ virtual ~Action() = 0;
+ virtual void execute(const ScAddress& rPos, SCROW nLength, bool bVal) = 0;
+ };
+
+ ~ColumnSpanSet();
+
+ void set(SCCOL nCol, SCROW nRow, SCTAB nTab, bool bVal);
+
+ void executeFromTop(Action& ac) const;
+ void executeFromBottom(Action& ac) const;
+};
+
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */