166 lines
6.1 KiB
C++
166 lines
6.1 KiB
C++
/*
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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 add_value.hpp
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* \author Andrey Semashev
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* \date 26.11.2012
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*
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* This header contains the \c add_value manipulator.
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*/
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#ifndef BOOST_LOG_UTILITY_MANIPULATORS_ADD_VALUE_HPP_INCLUDED_
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#define BOOST_LOG_UTILITY_MANIPULATORS_ADD_VALUE_HPP_INCLUDED_
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#include <boost/type_traits/is_scalar.hpp>
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#include <boost/type_traits/remove_cv.hpp>
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#include <boost/type_traits/remove_reference.hpp>
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#include <boost/type_traits/conditional.hpp>
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#include <boost/log/detail/config.hpp>
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#include <boost/log/detail/embedded_string_type.hpp>
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#include <boost/log/attributes/attribute_name.hpp>
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#include <boost/log/attributes/attribute_value_impl.hpp>
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#include <boost/log/expressions/keyword_fwd.hpp>
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#include <boost/log/sources/record_ostream.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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#ifdef _MSC_VER
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#pragma warning(push)
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// 'boost::log::v2s_mt_nt6::add_value_manip<RefT>::m_value' : reference member is initialized to a temporary that doesn't persist after the constructor exits
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// This is intentional since the manipulator can be used with a temporary, which will be used before the streaming expression ends and it is destroyed.
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#pragma warning(disable: 4413)
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// returning address of local variable or temporary
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// This warning refers to add_value_manip<RefT>::get_value() when RefT is an rvalue reference. We store the reference in the manipulator and we intend to return it as is.
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#pragma warning(disable: 4172)
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#endif
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namespace boost {
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BOOST_LOG_OPEN_NAMESPACE
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//! Attribute value manipulator
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template< typename RefT >
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class add_value_manip
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{
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public:
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//! Stored reference type
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typedef RefT reference_type;
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//! Attribute value type
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typedef typename remove_cv< typename remove_reference< reference_type >::type >::type value_type;
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private:
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// The stored reference type is an lvalue reference since apparently different compilers (GCC and MSVC) have different quirks when rvalue references are stored as members.
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// Additionally, MSVC (at least 11.0) has a bug which causes a dangling reference to be stored in the manipulator, if a scalar rvalue is passed to the add_value generator.
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// To work around this problem we save the value inside the manipulator in this case.
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typedef typename remove_reference< reference_type >::type& lvalue_reference_type;
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typedef typename conditional<
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is_scalar< value_type >::value,
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value_type,
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lvalue_reference_type
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>::type stored_type;
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typedef typename conditional<
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is_scalar< value_type >::value,
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value_type,
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reference_type
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>::type get_value_result_type;
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private:
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//! Attribute value
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stored_type m_value;
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//! Attribute name
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attribute_name m_name;
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public:
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//! Initializing constructor
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add_value_manip(attribute_name const& name, reference_type value) : m_value(static_cast< lvalue_reference_type >(value)), m_name(name)
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{
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}
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//! Returns attribute name
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attribute_name get_name() const { return m_name; }
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//! Returns attribute value
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get_value_result_type get_value() const { return static_cast< get_value_result_type >(m_value); }
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};
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//! The operator attaches an attribute value to the log record
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template< typename CharT, typename RefT >
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inline basic_record_ostream< CharT >& operator<< (basic_record_ostream< CharT >& strm, add_value_manip< RefT > const& manip)
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{
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typedef typename aux::make_embedded_string_type< typename add_value_manip< RefT >::value_type >::type value_type;
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attribute_value value(new attributes::attribute_value_impl< value_type >(manip.get_value()));
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strm.get_record().attribute_values().insert(manip.get_name(), value);
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return strm;
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}
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//! The function creates a manipulator that attaches an attribute value to a log record
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#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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template< typename T >
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inline add_value_manip< T&& > add_value(attribute_name const& name, T&& value)
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{
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return add_value_manip< T&& >(name, static_cast< T&& >(value));
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}
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//! \overload
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template< typename DescriptorT, template< typename > class ActorT >
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inline add_value_manip< typename DescriptorT::value_type&& >
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add_value(expressions::attribute_keyword< DescriptorT, ActorT > const&, typename DescriptorT::value_type&& value)
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{
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typedef typename DescriptorT::value_type value_type;
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return add_value_manip< value_type&& >(DescriptorT::get_name(), static_cast< value_type&& >(value));
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}
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//! \overload
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template< typename DescriptorT, template< typename > class ActorT >
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inline add_value_manip< typename DescriptorT::value_type& >
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add_value(expressions::attribute_keyword< DescriptorT, ActorT > const&, typename DescriptorT::value_type& value)
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{
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return add_value_manip< typename DescriptorT::value_type& >(DescriptorT::get_name(), value);
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}
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//! \overload
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template< typename DescriptorT, template< typename > class ActorT >
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inline add_value_manip< typename DescriptorT::value_type const& >
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add_value(expressions::attribute_keyword< DescriptorT, ActorT > const&, typename DescriptorT::value_type const& value)
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{
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return add_value_manip< typename DescriptorT::value_type const& >(DescriptorT::get_name(), value);
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}
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#else // !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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template< typename T >
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inline add_value_manip< T const& > add_value(attribute_name const& name, T const& value)
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{
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return add_value_manip< T const& >(name, value);
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}
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template< typename DescriptorT, template< typename > class ActorT >
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inline add_value_manip< typename DescriptorT::value_type const& >
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add_value(expressions::attribute_keyword< DescriptorT, ActorT > const&, typename DescriptorT::value_type const& value)
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{
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return add_value_manip< typename DescriptorT::value_type const& >(DescriptorT::get_name(), value);
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}
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#endif // !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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BOOST_LOG_CLOSE_NAMESPACE // namespace log
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} // namespace boost
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#ifdef _MSC_VER
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#pragma warning(pop)
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#endif
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#include <boost/log/detail/footer.hpp>
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#endif // BOOST_LOG_UTILITY_MANIPULATORS_ADD_VALUE_HPP_INCLUDED_
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