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 | |
25 | namespace 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 | */ |
33 | template<typename T> |
34 | class 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 | |