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diff --git a/src/spreadsheet/sheet_impl.hpp b/src/spreadsheet/sheet_impl.hpp
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * 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 INCLUDED_ORCUS_SPREADSHEET_SHEET_IMPL_HPP
+#define INCLUDED_ORCUS_SPREADSHEET_SHEET_IMPL_HPP
+
+#include "impl_types.hpp"
+#include "orcus/spreadsheet/auto_filter.hpp"
+
+namespace orcus { namespace spreadsheet {
+
+class document;
+class sheet;
+
+namespace detail {
+
+using segment_row_index_type = mdds::flat_segment_tree<row_t, std::size_t>;
+using segment_col_index_type = mdds::flat_segment_tree<col_t, std::size_t>;
+typedef std::unordered_map<col_t, std::unique_ptr<segment_row_index_type>> cell_format_type;
+
+// Widths and heights are stored in twips.
+typedef mdds::flat_segment_tree<col_t, col_width_t> col_widths_store_type;
+typedef mdds::flat_segment_tree<row_t, row_height_t> row_heights_store_type;
+
+// hidden information
+typedef mdds::flat_segment_tree<col_t, bool> col_hidden_store_type;
+typedef mdds::flat_segment_tree<row_t, bool> row_hidden_store_type;
+
+struct sheet_impl
+{
+    document& doc;
+
+    mutable col_widths_store_type col_widths;
+    mutable row_heights_store_type row_heights;
+    col_widths_store_type::const_iterator col_width_pos;
+    row_heights_store_type::const_iterator row_height_pos;
+
+    mutable col_hidden_store_type col_hidden;
+    mutable row_hidden_store_type row_hidden;
+    col_hidden_store_type::const_iterator col_hidden_pos;
+    row_hidden_store_type::const_iterator row_hidden_pos;
+
+    detail::col_merge_size_type merge_ranges; /// 2-dimensional merged cell ranges.
+
+    std::unique_ptr<auto_filter_t> auto_filter_data;
+
+    cell_format_type cell_formats;
+    segment_col_index_type column_formats;
+    segment_row_index_type row_formats;
+    const sheet_t sheet_id;
+
+    sheet_impl() = delete;
+    sheet_impl(const sheet_impl&) = delete;
+    sheet_impl& operator=(const sheet_impl&) = delete;
+
+    sheet_impl(document& _doc, sheet& sh, sheet_t sheet_index);
+    ~sheet_impl();
+
+    const detail::merge_size* get_merge_size(row_t row, col_t col) const;
+
+    ixion::abs_range_t get_data_range() const;
+};
+
+}}}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */