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- /*
- * Copyright Andrey Semashev 2007 - 2015.
- * Distributed under the Boost Software License, Version 1.0.
- * (See accompanying file LICENSE_1_0.txt or copy at
- * http://www.boost.org/LICENSE_1_0.txt)
- */
- /*!
- * \file filter.hpp
- * \author Andrey Semashev
- * \date 13.07.2012
- *
- * The header contains a filter function object definition.
- */
- #ifndef BOOST_LOG_EXPRESSIONS_FILTER_HPP_INCLUDED_
- #define BOOST_LOG_EXPRESSIONS_FILTER_HPP_INCLUDED_
- #include <boost/move/core.hpp>
- #include <boost/move/utility_core.hpp>
- #if defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
- #include <boost/type_traits/is_same.hpp>
- #include <boost/type_traits/remove_cv.hpp>
- #include <boost/log/detail/sfinae_tools.hpp>
- #endif
- #include <boost/log/detail/config.hpp>
- #include <boost/log/attributes/attribute_value_set.hpp>
- #include <boost/log/detail/light_function.hpp>
- #include <boost/log/detail/header.hpp>
- #ifdef BOOST_HAS_PRAGMA_ONCE
- #pragma once
- #endif
- namespace boost {
- BOOST_LOG_OPEN_NAMESPACE
- /*!
- * Log record filter function wrapper.
- */
- class filter
- {
- BOOST_COPYABLE_AND_MOVABLE(filter)
- public:
- //! Result type
- typedef bool result_type;
- private:
- //! Filter function type
- typedef boost::log::aux::light_function< bool (attribute_value_set const&) > filter_type;
- //! Default filter, always returns \c true
- struct default_filter
- {
- typedef bool result_type;
- result_type operator() (attribute_value_set const&) const { return true; }
- };
- private:
- //! Filter function
- filter_type m_Filter;
- public:
- /*!
- * Default constructor. Creates a filter that always returns \c true.
- */
- filter() : m_Filter(default_filter())
- {
- }
- /*!
- * Copy constructor
- */
- filter(filter const& that) : m_Filter(that.m_Filter)
- {
- }
- /*!
- * Move constructor. The moved-from filter is left in an unspecified state.
- */
- filter(BOOST_RV_REF(filter) that) BOOST_NOEXCEPT : m_Filter(boost::move(that.m_Filter))
- {
- }
- /*!
- * Initializing constructor. Creates a filter which will invoke the specified function object.
- */
- #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
- template< typename FunT >
- filter(FunT&& fun) : m_Filter(boost::forward< FunT >(fun))
- {
- }
- #elif !defined(BOOST_MSVC) || BOOST_MSVC >= 1600
- template< typename FunT >
- filter(FunT const& fun, typename boost::disable_if_c< move_detail::is_rv< FunT >::value, boost::log::aux::sfinae_dummy >::type = boost::log::aux::sfinae_dummy()) : m_Filter(fun)
- {
- }
- #else
- // MSVC 9 and older blows up in unexpected ways if we use SFINAE to disable constructor instantiation
- template< typename FunT >
- filter(FunT const& fun) : m_Filter(fun)
- {
- }
- template< typename FunT >
- filter(rv< FunT >& fun) : m_Filter(fun)
- {
- }
- template< typename FunT >
- filter(rv< FunT > const& fun) : m_Filter(static_cast< FunT const& >(fun))
- {
- }
- filter(rv< filter > const& that) : m_Filter(that.m_Filter)
- {
- }
- #endif
- /*!
- * Move assignment. The moved-from filter is left in an unspecified state.
- */
- filter& operator= (BOOST_RV_REF(filter) that) BOOST_NOEXCEPT
- {
- m_Filter.swap(that.m_Filter);
- return *this;
- }
- /*!
- * Copy assignment.
- */
- filter& operator= (BOOST_COPY_ASSIGN_REF(filter) that)
- {
- m_Filter = that.m_Filter;
- return *this;
- }
- /*!
- * Initializing assignment. Sets the specified function object to the filter.
- */
- #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
- template< typename FunT >
- filter& operator= (FunT const& fun)
- #else
- template< typename FunT >
- typename boost::disable_if_c< is_same< typename remove_cv< FunT >::type, filter >::value, filter& >::type
- operator= (FunT const& fun)
- #endif
- {
- filter(fun).swap(*this);
- return *this;
- }
- /*!
- * Filtering operator.
- *
- * \param values Attribute values of the log record.
- * \return \c true if the log record passes the filter, \c false otherwise.
- */
- result_type operator() (attribute_value_set const& values) const
- {
- return m_Filter(values);
- }
- /*!
- * Resets the filter to the default. The default filter always returns \c true.
- */
- void reset()
- {
- m_Filter = default_filter();
- }
- /*!
- * Swaps two filters
- */
- void swap(filter& that) BOOST_NOEXCEPT
- {
- m_Filter.swap(that.m_Filter);
- }
- };
- inline void swap(filter& left, filter& right) BOOST_NOEXCEPT
- {
- left.swap(right);
- }
- BOOST_LOG_CLOSE_NAMESPACE // namespace log
- } // namespace boost
- #include <boost/log/detail/footer.hpp>
- #endif // BOOST_LOG_EXPRESSIONS_FILTER_HPP_INCLUDED_
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