1/** @file derefwrapper.h
2 * @brief Class for wrapping type returned by an input_iterator.
3 */
4/* Copyright (C) 2004,2008,2009 Olly Betts
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation; either version 2 of the
9 * License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
19 * USA
20 */
21
22#ifndef XAPIAN_INCLUDED_DEREFWRAPPER_H
23#define XAPIAN_INCLUDED_DEREFWRAPPER_H
24
25namespace Xapian {
26
27/** @private @internal Class which returns a value when dereferenced with
28 * operator*.
29 *
30 * We need this wrapper class to implement input_iterator semantics for the
31 * postfix operator++ methods of some of our iterator classes.
32 */
33template<typename T>
34class DerefWrapper_ {
35 /// Don't allow assignment.
36 void operator=(const DerefWrapper_ &);
37
38 /// The value.
39 T res;
40
41 public:
42 explicit DerefWrapper_(const T &res_) : res(res_) { }
43 const T & operator*() const { return res; }
44};
45
46}
47
48#endif // XAPIAN_INCLUDED_DEREFWRAPPER_H
49