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1 | /* Copyright 2003-2013 Joaquin M Lopez Munoz. |
2 | * Distributed under the Boost Software License, Version 1.0. | |
3 | * (See accompanying file LICENSE_1_0.txt or copy at | |
4 | * http://www.boost.org/LICENSE_1_0.txt) | |
5 | * | |
6 | * See http://www.boost.org/libs/multi_index for library home page. | |
7 | */ | |
8 | ||
9 | #ifndef BOOST_MULTI_INDEX_DETAIL_MODIFY_KEY_ADAPTOR_HPP | |
10 | #define BOOST_MULTI_INDEX_DETAIL_MODIFY_KEY_ADAPTOR_HPP | |
11 | ||
12 | #if defined(_MSC_VER) | |
13 | #pragma once | |
14 | #endif | |
15 | ||
16 | namespace boost{ | |
17 | ||
18 | namespace multi_index{ | |
19 | ||
20 | namespace detail{ | |
21 | ||
22 | /* Functional adaptor to resolve modify_key as a call to modify. | |
23 | * Preferred over compose_f_gx and stuff cause it eliminates problems | |
24 | * with references to references, dealing with function pointers, etc. | |
25 | */ | |
26 | ||
27 | template<typename Fun,typename Value,typename KeyFromValue> | |
28 | struct modify_key_adaptor | |
29 | { | |
30 | ||
31 | modify_key_adaptor(Fun f_,KeyFromValue kfv_):f(f_),kfv(kfv_){} | |
32 | ||
33 | void operator()(Value& x) | |
34 | { | |
35 | f(kfv(x)); | |
36 | } | |
37 | ||
38 | private: | |
39 | Fun f; | |
40 | KeyFromValue kfv; | |
41 | }; | |
42 | ||
43 | } /* namespace multi_index::detail */ | |
44 | ||
45 | } /* namespace multi_index */ | |
46 | ||
47 | } /* namespace boost */ | |
48 | ||
49 | #endif |