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 |
50 | |