117 lines
3.3 KiB
C++
117 lines
3.3 KiB
C++
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/*
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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 attribute_predicate.hpp
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* \author Andrey Semashev
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* \date 02.09.2012
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*
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* The header contains implementation of a generic predicate in template expressions.
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*/
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#ifndef BOOST_LOG_DETAIL_ATTRIBUTE_PREDICATE_HPP_INCLUDED_
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#define BOOST_LOG_DETAIL_ATTRIBUTE_PREDICATE_HPP_INCLUDED_
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#include <boost/phoenix/core/actor.hpp>
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#include <boost/utility/result_of.hpp>
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#include <boost/log/detail/config.hpp>
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#include <boost/log/attributes/attribute_name.hpp>
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#include <boost/log/attributes/value_visitation.hpp>
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#include <boost/log/attributes/fallback_policy.hpp>
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#include <boost/log/utility/functional/bind.hpp>
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#include <boost/log/utility/functional/save_result.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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namespace expressions {
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namespace aux {
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/*!
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* The predicate checks if the attribute value satisfies a predicate.
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*/
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template< typename T, typename ArgT, typename PredicateT, typename FallbackPolicyT = fallback_to_none >
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class attribute_predicate
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{
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public:
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//! Function result_type
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typedef bool result_type;
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//! Expected attribute value type
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typedef T value_type;
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//! Predicate type
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typedef PredicateT predicate_type;
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//! Argument type for the predicate
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typedef ArgT argument_type;
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//! Fallback policy
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typedef FallbackPolicyT fallback_policy;
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private:
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//! Argument for the predicate
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const argument_type m_arg;
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//! Attribute value name
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const attribute_name m_name;
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//! Visitor invoker
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value_visitor_invoker< value_type, fallback_policy > m_visitor_invoker;
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public:
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/*!
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* Initializing constructor
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*
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* \param name Attribute name
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* \param pred_arg The predicate argument
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*/
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attribute_predicate(attribute_name const& name, argument_type const& pred_arg) : m_arg(pred_arg), m_name(name)
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{
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}
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/*!
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* Initializing constructor
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*
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* \param name Attribute name
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* \param pred_arg The predicate argument
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* \param arg Additional parameter for the fallback policy
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*/
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template< typename U >
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attribute_predicate(attribute_name const& name, argument_type const& pred_arg, U const& arg) : m_arg(pred_arg), m_name(name), m_visitor_invoker(arg)
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{
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}
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/*!
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* Checking operator
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*
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* \param arg A set of attribute values or a log record
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* \return \c true if the log record contains the sought attribute value, \c false otherwise
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*/
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template< typename ArgumentT >
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result_type operator() (ArgumentT const& arg) const
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{
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typedef binder2nd< predicate_type, argument_type const& > visitor_type;
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bool res = false;
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m_visitor_invoker(m_name, arg, boost::log::save_result(visitor_type(predicate_type(), m_arg), res));
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return res;
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}
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};
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} // namespace aux
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} // namespace expressions
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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_DETAIL_ATTRIBUTE_PREDICATE_HPP_INCLUDED_
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