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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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