我将boost.log用于我的项目。 但是,当我尝试为接收器设置过滤器时,出现了编译错误。
代码很简单:
BOOST_LOG_ATTRIBUTE_KEYWORD(MyTag, "My_Tag", std::string);
BOOST_LOG_INLINE_GLOBAL_LOGGER_CTOR_ARGS(
my_logger
, boost::log::sources::channel_logger_mt< >
, (boost::log::keywords::channel = "default"))
typedef boost::log::sinks::synchronous_sink<
boost::log::sinks::text_ostream_backend > TextSink;
boost::shared_ptr< TextSink > logSink = boost::make_shared< TextSink >();
auto backSink = boost::make_shared<std::ofstream>("default.log");
!!! compilation error, no add_attribute in channel_logger !!!
my_logger::get().add_attribute("My_Tag"
, boost::log::attributes::constant<String>("My_Tag"));
logSink->set_filter(
boost::log::expressions::has_attr(MyTag)
!!! compilation error, invalid operand expression between attribute_actor and std::string !!!
&& boost::log::expressions::attr<std::string>("My_Tag")==std::string("My_Tag")
!!! compilation error, invalid operand expression between attribute_keyword<tag::MyTag> and char[7] !!!
&& MyTag=="My_Tag"
我也尝试定义过滤器功能,但出现以下错误:
bool my_filter(
boost::log::value_ref< std::string
!!! compilation error, no tag_attr in boost::log::expressions::tag !!!
, boost::log::expressions::tag::tag_attr > const& tag)
{
return level >= warning || tag == "IMPORTANT_MESSAGE";
}
顺便说一句,我也有以下错误,但是如果解决了所有其他编译错误,此错误将消失。
!!! no open_record in severity_logger_mt !!!
BOOST_LOG_SEV(slg, normal) << "A regular message";
完整代码:
#include <boost/phoenix/operator.hpp>
#include <boost/log/sources/channel_logger.hpp>
#include <boost/log/attributes.hpp>
#include <boost/log/attributes/attribute.hpp>
#include <boost/log/attributes/attribute_cast.hpp>
#include <boost/log/keywords/filter.hpp>
#include <boost/log/expressions/predicates.hpp>
#include <boost/log/expressions/attr_fwd.hpp>
#include <boost/log/expressions/attr.hpp>
#include <boost/log/expressions.hpp>
#include <boost/log/sinks.hpp>
BOOST_LOG_INLINE_GLOBAL_LOGGER_CTOR_ARGS(
my_channel_logger
, boost::log::sources::channel_logger_mt< >
, (boost::log::keywords::channel = "channel"))
BOOST_LOG_ATTRIBUTE_KEYWORD(MyTag, "My_Tag", std::string);
typedef boost::log::sinks::synchronous_sink<
boost::log::sinks::text_ostream_backend > TextSink;
static boost::shared_ptr< TextSink > logSink = boost::make_shared< TextSink >();
static auto backSink = boost::make_shared<std::ofstream>("output.log");
void func() {
!!! compilation error, no 'open_record' in channel_logger_mt !!!
BOOST_LOG_CHANNEL(my_channel_logger::get(), "channel")<<"channel log";
!!! compilation error, no add_attribute in channel_logger !!!
my_channel_logger::get().add_attribute("My_Tag"
, boost::log::attributes::constant<String>("My_Tag"));
}
no open_record in channel_logger_mt
的编译错误:
***.cpp:87:5: error: no member named 'open_record' in 'boost::log::v2_mt_nt6::sources::channel_logger_mt<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >'
channel_feature.hpp:236:41: note: expanded from macro 'BOOST_LOG_CHANNEL'
channel_feature.hpp:231:5: note: expanded from macro 'BOOST_LOG_STREAM_CHANNEL'
record_ostream.hpp:566:5: note: expanded from macro 'BOOST_LOG_STREAM_WITH_PARAMS'
record_ostream.hpp:555:50: note: expanded from macro 'BOOST_LOG_STREAM_WITH_PARAMS_INTERNAL'
no add_attribute in channel_logger_mt
的编译错误:
***.cpp:76:31: error: no member named 'add_attribute' in 'boost::log::v2_mt_nt6::sources::channel_logger_mt<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >'
答案 0 :(得分:1)
很可能您的代码中缺少#include
。
!!! compilation error, no add_attribute in channel_logger !!!
my_logger::get().add_attribute("My_Tag"
, boost::log::attributes::constant<String>("My_Tag"));
add_attribute
由basic_composite_logger
定义,channel_logger_mt
derives从中定义。您需要包括boost/log/sources/channel_logger.hpp
。
!!! compilation error, invalid operand expression between attribute_actor and std::string !!!
&& boost::log::expressions::attr<std::string>("My_Tag")==std::string("My_Tag")
!!! compilation error, invalid operand expression between attribute_keyword<tag::MyTag> and char[7] !!!
&& MyTag=="My_Tag"
很可能您缺少包含boost/phoenix/operator.hpp
的内容。或者,您可以包括boost/log/expressions.hpp
,它会自动为您包括它。
!!! no open_record in severity_logger_mt !!!
BOOST_LOG_SEV(slg, normal) << "A regular message";
与channel_logger_mt
相同。您需要包括boost/log/sources/severity_logger.hpp
。
请注意,对于文档中的每个组件,在本节的开头都有相关的Boost.Log标头列表。 Here是严重性记录器的示例。
2019年7月3日更新:
您的完整代码会编译,如果添加了以下内容:
#include <string>
#include <fstream>
#include <boost/smart_ptr/shared_ptr.hpp>
#include <boost/smart_ptr/make_shared_object.hpp>
#include <boost/log/sources/global_logger_storage.hpp>
#include <boost/log/sources/record_ostream.hpp>
我还必须删除“ !!!”行,并在std::string
属性中使用String
代替constant
。
通常,您必须为代码中使用的每个组件都包含一个标题。