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1 | /* |
2 | * Copyright Andrey Semashev 2007 - 2015. | |
3 | * Distributed under the Boost Software License, Version 1.0. | |
4 | * (See accompanying file LICENSE_1_0.txt or copy at | |
5 | * http://www.boost.org/LICENSE_1_0.txt) | |
6 | */ | |
7 | /*! | |
8 | * \file contains.hpp | |
9 | * \author Andrey Semashev | |
10 | * \date 30.03.2008 | |
11 | * | |
12 | * This header contains a predicate for checking if the provided string contains a substring. | |
13 | */ | |
14 | ||
15 | #ifndef BOOST_LOG_UTILITY_FUNCTIONAL_CONTAINS_HPP_INCLUDED_ | |
16 | #define BOOST_LOG_UTILITY_FUNCTIONAL_CONTAINS_HPP_INCLUDED_ | |
17 | ||
18 | #include <boost/log/detail/config.hpp> | |
19 | #include <boost/log/detail/header.hpp> | |
20 | ||
21 | #ifdef BOOST_HAS_PRAGMA_ONCE | |
22 | #pragma once | |
23 | #endif | |
24 | ||
25 | namespace boost { | |
26 | ||
27 | BOOST_LOG_OPEN_NAMESPACE | |
28 | ||
29 | //! The \c contains functor | |
30 | struct contains_fun | |
31 | { | |
32 | typedef bool result_type; | |
33 | ||
34 | template< typename T, typename U > | |
35 | bool operator() (T const& left, U const& right) const | |
36 | { | |
37 | typedef typename T::const_iterator left_iterator; | |
38 | typedef typename U::const_iterator right_iterator; | |
39 | ||
40 | typename U::size_type const right_size = right.size(); | |
41 | if (left.size() >= right_size) | |
42 | { | |
43 | const left_iterator search_end = left.end() - right_size + 1; | |
44 | const right_iterator right_end = right.end(); | |
45 | for (left_iterator it = left.begin(); it != search_end; ++it) | |
46 | { | |
47 | left_iterator left_it = it; | |
48 | right_iterator right_it = right.begin(); | |
49 | for (; right_it != right_end; ++left_it, ++right_it) | |
50 | { | |
51 | if (*left_it != *right_it) | |
52 | break; | |
53 | } | |
54 | if (right_it == right_end) | |
55 | return true; | |
56 | } | |
57 | } | |
58 | ||
59 | return false; | |
60 | } | |
61 | }; | |
62 | ||
63 | BOOST_LOG_CLOSE_NAMESPACE // namespace log | |
64 | ||
65 | } // namespace boost | |
66 | ||
67 | #include <boost/log/detail/footer.hpp> | |
68 | ||
69 | #endif // BOOST_LOG_UTILITY_FUNCTIONAL_CONTAINS_HPP_INCLUDED_ |