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31f0ccce RC |
1 | /* |
2 | * Copyright (c) 2003 Robert Collins. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * A copy of the GNU General Public License can be found at | |
10 | * http://www.gnu.org/ | |
11 | * | |
12 | * Written by Robert Collins <robertc@hotmail.com> | |
13 | * | |
14 | */ | |
15 | ||
16 | #ifndef SETUP_GENERIC_H | |
17 | #define SETUP_GENERIC_H | |
18 | ||
19 | /* Todo fully paramterise */ | |
20 | template <class _Visitor, class _Predicate> | |
21 | struct _visit_if { | |
22 | _visit_if(_Visitor v, _Predicate p) : visitor(v), predicate (p) {} | |
23 | void operator() (typename _Visitor::argument_type& arg) { | |
24 | if (predicate(arg)) | |
25 | visitor(arg); | |
26 | } | |
27 | _Visitor visitor; | |
28 | _Predicate predicate; | |
29 | }; | |
30 | ||
31 | template <class _Visitor, class _Predicate> | |
32 | _visit_if<_Visitor, _Predicate> | |
33 | visit_if(_Visitor visitor, _Predicate predicate) | |
34 | { | |
35 | return _visit_if<_Visitor, _Predicate>(visitor, predicate); | |
36 | } | |
37 | ||
38 | #endif /* SETUP_GENERIC_H */ |