/*
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* Copyright Andrey Semashev 2007 - 2015.
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*/
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/*!
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* \file contains.hpp
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* \author Andrey Semashev
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* \date 30.03.2008
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*
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* This header contains a predicate for checking if the provided string contains a substring.
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*/
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#ifndef BOOST_LOG_UTILITY_FUNCTIONAL_CONTAINS_HPP_INCLUDED_
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#define BOOST_LOG_UTILITY_FUNCTIONAL_CONTAINS_HPP_INCLUDED_
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#include <boost/log/detail/config.hpp>
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#include <boost/log/detail/header.hpp>
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#ifdef BOOST_HAS_PRAGMA_ONCE
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#pragma once
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#endif
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namespace boost {
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BOOST_LOG_OPEN_NAMESPACE
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//! The \c contains functor
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struct contains_fun
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{
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typedef bool result_type;
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template< typename T, typename U >
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bool operator() (T const& left, U const& right) const
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{
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typedef typename T::const_iterator left_iterator;
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typedef typename U::const_iterator right_iterator;
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typename U::size_type const right_size = right.size();
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if (left.size() >= right_size)
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{
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const left_iterator search_end = left.end() - right_size + 1;
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const right_iterator right_end = right.end();
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for (left_iterator it = left.begin(); it != search_end; ++it)
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{
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left_iterator left_it = it;
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right_iterator right_it = right.begin();
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for (; right_it != right_end; ++left_it, ++right_it)
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{
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if (*left_it != *right_it)
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break;
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}
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if (right_it == right_end)
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return true;
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}
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}
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return false;
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}
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};
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BOOST_LOG_CLOSE_NAMESPACE // namespace log
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} // namespace boost
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#include <boost/log/detail/footer.hpp>
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#endif // BOOST_LOG_UTILITY_FUNCTIONAL_CONTAINS_HPP_INCLUDED_
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