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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 keyword.hpp
* \author Andrey Semashev
* \date 29.01.2012
*
* The header contains attribute keyword declaration.
*/
#ifndef BOOST_LOG_EXPRESSIONS_KEYWORD_HPP_INCLUDED_
#define BOOST_LOG_EXPRESSIONS_KEYWORD_HPP_INCLUDED_
#include <boost/ref.hpp>
#include <boost/proto/extends.hpp>
#include <boost/proto/make_expr.hpp>
#include <boost/phoenix/core/actor.hpp>
#include <boost/phoenix/core/domain.hpp>
#include <boost/phoenix/core/environment.hpp>
#include <boost/fusion/sequence/intrinsic/at.hpp>
#include <boost/preprocessor/cat.hpp>
#include <boost/log/detail/config.hpp>
#include <boost/log/detail/custom_terminal_spec.hpp>
#include <boost/log/expressions/keyword_fwd.hpp>
#include <boost/log/expressions/is_keyword_descriptor.hpp>
#include <boost/log/expressions/attr.hpp>
#include <boost/log/attributes/attribute_name.hpp>
#include <boost/log/attributes/value_extraction.hpp>
#include <boost/log/attributes/fallback_policy.hpp>
#include <boost/log/detail/header.hpp>
#ifdef BOOST_HAS_PRAGMA_ONCE
#pragma once
#endif
namespace boost {
BOOST_LOG_OPEN_NAMESPACE
namespace expressions {
/*!
* This class implements an expression template keyword. It is used to start template expressions involving attribute values.
*/
template< typename DescriptorT, template< typename > class ActorT >
struct attribute_keyword
{
//! Self type
typedef attribute_keyword this_type;
//! Attribute descriptor type
typedef DescriptorT descriptor_type;
BOOST_PROTO_BASIC_EXTENDS(typename proto::terminal< descriptor_type >::type, this_type, phoenix::phoenix_domain)
//! Attribute value type
typedef typename descriptor_type::value_type value_type;
//! Returns attribute name
static attribute_name get_name() { return descriptor_type::get_name(); }
//! Expression with cached attribute name
typedef attribute_actor<
value_type,
fallback_to_none,
descriptor_type,
ActorT
> or_none_result_type;
//! Generates an expression that extracts the attribute value or a default value
static or_none_result_type or_none()
{
typedef typename or_none_result_type::terminal_type result_terminal;
typename or_none_result_type::base_type act = {{ result_terminal(get_name()) }};
return or_none_result_type(act);
}
//! Expression with cached attribute name
typedef attribute_actor<
value_type,
fallback_to_throw,
descriptor_type,
ActorT
> or_throw_result_type;
//! Generates an expression that extracts the attribute value or throws an exception
static or_throw_result_type or_throw()
{
typedef typename or_throw_result_type::terminal_type result_terminal;
typename or_throw_result_type::base_type act = {{ result_terminal(get_name()) }};
return or_throw_result_type(act);
}
//! Generates an expression that extracts the attribute value or a default value
template< typename DefaultT >
static attribute_actor<
value_type,
fallback_to_default< DefaultT >,
descriptor_type,
ActorT
> or_default(DefaultT const& def_val)
{
typedef attribute_actor<
value_type,
fallback_to_default< DefaultT >,
descriptor_type,
ActorT
> or_default_result_type;
typedef typename or_default_result_type::terminal_type result_terminal;
typename or_default_result_type::base_type act = {{ result_terminal(get_name(), def_val) }};
return or_default_result_type(act);
}
};
} // namespace expressions
BOOST_LOG_CLOSE_NAMESPACE // namespace log
#ifndef BOOST_LOG_DOXYGEN_PASS
namespace proto {
namespace detail {
// This hack is needed in order to cache attribute name into the expression terminal when the template
// expression is constructed. The standard way through a custom domain doesn't work because phoenix::actor
// is bound to phoenix_domain.
template< typename DescriptorT, template< typename > class ActorT, typename DomainT >
struct protoify< boost::log::expressions::attribute_keyword< DescriptorT, ActorT >, DomainT >
{
typedef boost::log::expressions::attribute_keyword< DescriptorT, ActorT > keyword_type;
typedef typename keyword_type::or_none_result_type result_type;
result_type operator() (keyword_type const& keyword) const
{
return keyword.or_none();
}
};
template< typename DescriptorT, template< typename > class ActorT, typename DomainT >
struct protoify< boost::log::expressions::attribute_keyword< DescriptorT, ActorT >&, DomainT > :
public protoify< boost::log::expressions::attribute_keyword< DescriptorT, ActorT >, DomainT >
{
};
template< typename DescriptorT, template< typename > class ActorT, typename DomainT >
struct protoify< boost::log::expressions::attribute_keyword< DescriptorT, ActorT > const&, DomainT > :
public protoify< boost::log::expressions::attribute_keyword< DescriptorT, ActorT >, DomainT >
{
};
template< typename DescriptorT, template< typename > class ActorT, typename DomainT >
struct protoify< boost::reference_wrapper< boost::log::expressions::attribute_keyword< DescriptorT, ActorT > >, DomainT > :
public protoify< boost::log::expressions::attribute_keyword< DescriptorT, ActorT >, DomainT >
{
};
template< typename DescriptorT, template< typename > class ActorT, typename DomainT >
struct protoify< boost::reference_wrapper< boost::log::expressions::attribute_keyword< DescriptorT, ActorT > > const, DomainT > :
public protoify< boost::log::expressions::attribute_keyword< DescriptorT, ActorT >, DomainT >
{
};
template< typename DescriptorT, template< typename > class ActorT, typename DomainT >
struct protoify< boost::reference_wrapper< const boost::log::expressions::attribute_keyword< DescriptorT, ActorT > >, DomainT > :
public protoify< boost::log::expressions::attribute_keyword< DescriptorT, ActorT >, DomainT >
{
};
template< typename DescriptorT, template< typename > class ActorT, typename DomainT >
struct protoify< boost::reference_wrapper< const boost::log::expressions::attribute_keyword< DescriptorT, ActorT > > const, DomainT > :
public protoify< boost::log::expressions::attribute_keyword< DescriptorT, ActorT >, DomainT >
{
};
} // namespace detail
} // namespace proto
#endif // !defined(BOOST_LOG_DOXYGEN_PASS)
} // namespace boost
#ifndef BOOST_LOG_DOXYGEN_PASS
#define BOOST_LOG_ATTRIBUTE_KEYWORD_TYPE_IMPL(keyword_, name_, value_type_, tag_ns_)\
namespace tag_ns_\
{\
struct keyword_ :\
public ::boost::log::expressions::keyword_descriptor\
{\
typedef value_type_ value_type;\
static ::boost::log::attribute_name get_name() { return ::boost::log::attribute_name(name_); }\
};\
}\
typedef ::boost::log::expressions::attribute_keyword< tag_ns_::keyword_ > BOOST_PP_CAT(keyword_, _type);
#define BOOST_LOG_ATTRIBUTE_KEYWORD_IMPL(keyword_, name_, value_type_, tag_ns_)\
BOOST_LOG_ATTRIBUTE_KEYWORD_TYPE_IMPL(keyword_, name_, value_type_, tag_ns_)\
const BOOST_PP_CAT(keyword_, _type) keyword_ = {};
#endif // BOOST_LOG_DOXYGEN_PASS
/*!
* \brief The macro declares an attribute keyword type
*
* The macro should be used at a namespace scope. It expands into an attribute keyword type definition, including the
* \c tag namespace and the keyword tag type within which has the following layout:
*
* \code
* namespace tag
* {
* struct keyword_ :
* public boost::log::expressions::keyword_descriptor
* {
* typedef value_type_ value_type;
* static boost::log::attribute_name get_name();
* };
* }
*
* typedef boost::log::expressions::attribute_keyword< tag::keyword_ > keyword_type;
* \endcode
*
* The \c get_name method returns the attribute name.
*
* \note This macro only defines the type of the keyword. To also define the keyword object, use
* the \c BOOST_LOG_ATTRIBUTE_KEYWORD macro instead.
*
* \param keyword_ Keyword name
* \param name_ Attribute name string
* \param value_type_ Attribute value type
*/
#define BOOST_LOG_ATTRIBUTE_KEYWORD_TYPE(keyword_, name_, value_type_)\
BOOST_LOG_ATTRIBUTE_KEYWORD_TYPE_IMPL(keyword_, name_, value_type_, tag)
/*!
* \brief The macro declares an attribute keyword
*
* The macro provides definitions similar to \c BOOST_LOG_ATTRIBUTE_KEYWORD_TYPE and additionally
* defines the keyword object.
*
* \param keyword_ Keyword name
* \param name_ Attribute name string
* \param value_type_ Attribute value type
*/
#define BOOST_LOG_ATTRIBUTE_KEYWORD(keyword_, name_, value_type_)\
BOOST_LOG_ATTRIBUTE_KEYWORD_IMPL(keyword_, name_, value_type_, tag)
#include <boost/log/detail/footer.hpp>
#if defined(BOOST_LOG_TRIVIAL_HPP_INCLUDED_)
#include <boost/log/detail/trivial_keyword.hpp>
#endif
#endif // BOOST_LOG_EXPRESSIONS_KEYWORD_HPP_INCLUDED_
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