升压set_filter不工作 [英] Boost set_filter is not working
问题描述
我学习的推动作用。下面的教程,我试图通过发送一个参考方法onlyWarnings设置在水槽的过滤器。
简介:
sink-> set_filter(安培; onlyWarnings);
在onlyWarnings:
设置[严重性]提取< INT>()//始终为0
我显然缺少我的code的东西,教程的一个重要组成部分。
标题:
的#ifndef ONEPRINT_LOGGER_H
#定义ONEPRINT_LOGGER_H#包括LT&;升压/日志/核心/ core.hpp>
#包括LT&;升压/日志/属性/ attribute_value_set.hpp>
#包括LT&;升压/日志/ trivial.hpp>
#包括LT&;升压/日志/来源/ severity_logger.hpp>
#包括LT&;升压/日志/工具/设置/ file.hpp>
#包括LT&;升压/日志/工具/设置/ console.hpp>
#包括LT&;升压/日志/工具/设置/ common_attributes.hpp>
#包括LT&;升压/日志/ sinks.hpp>
#包括LT&;升压/核心/ null_deleter.hpp>
#包括LT&;&iostream的GT;命名空间EXPR =提振::登录::前pressions;
命名空间来源=的boost ::登录::来源;
命名空间=下沉的boost ::登录::汇;
命名空间关键字=提振::登录::关键词;命名空间IDS { 枚举severity_level
{
正常,
警告,
错误,
危急
}; 类记录器{
上市:
记录仪();
〜记录仪();
无效的Logit(的std :: string信息); 保护:
汇的typedef :: asynchronous_sink<汇:: text_ostream_backend> asynchronousSink;
无效设置→();
};}
#ENDIF // ONEPRINT_LOGGER_H
CPP:
的#includeLogger.h一流的计数器;使用命名空间的ID;命名空间{//非成员方法
布尔onlyWarnings(常量的boost ::登录:: attribute_value_set&安培;集)
{
返回设置[严重性]提取<&诠释GT;()> 0;
} 无效severity_and_message(常量的boost ::登录:: record_view&放大器;查看,提振::登录:: formatting_ostream&放大器; OS)
{
OS<< 。view.attribute_values()[严重性]提取<&诠释GT;()<< :&所述;&下;
view.attribute_values()[消息]提取<标准::字符串>();
}
}记录仪记录仪::(){
设置→();
Logit模型(测试);
}记录仪::〜记录仪(){}无效记录仪::设置→()
{
提高:: shared_ptr的<提高::登录::核心>核心=提振::登录::核心::得到();
提高:: shared_ptr的<汇:: text_ostream_backend>后端=的boost :: make_shared<汇:: text_ostream_backend>(); 提高:: shared_ptr的<记录仪:: asynchronousSink>沉(新记录器:: asynchronousSink(后端));
提高:: shared_ptr的<的std :: ostream的>流{&放大器;的std ::堵塞,提振:: null_deleter {}};
sink-> locked_backend() - > add_stream(流); sink-> set_filter(安培; onlyWarnings);
sink-> set_formatter(安培; severity_and_message); 核心 - > add_sink(片);
}无效记录仪:: Logit模型(的std :: string信息){
BOOST_LOG_TRIVIAL(警告)LT;<味精; 来源:: severity_logger< severity_level> severityLogger;
BOOST_LOG_SEV(severityLogger,关键)LT;<味精;
}
您确定严重程度只是另一个属性?我建议你从开始工作的例子,像这样的:
的http://www.boost.org/doc/libs/1_56_0/libs/log/doc/html/log/tutorial/advanced_filtering.html
http://boost-log.sourceforge.net/库/日志/例子/ DOC / tutorial_filtering.cpp
你让他们工作,你开始自己的编码之前?
标签严重性记录仪有一个例子过滤器,看起来你很不同。
布尔my_filter(登录:: value_ref< severity_level,标签::严重程度和GT;常量和放大器;水平,
记录:: value_ref<标准::字符串,标签:: tag_attr>常量和放大器;标签)
{
返回级> = ||警告标签==IMPORTANT_MESSAGE
}
也许尝试更多的东西,如:
布尔my_filter(登录:: value_ref< severity_level,标签::严重程度和GT;常量和放大器;电平)
{
返回级> =警告;
}
I'm learning Boost. Following a tutorial, I try to set a filter on a sink by sending a reference to the method onlyWarnings.
Brief:
sink->set_filter(&onlyWarnings);
In onlyWarnings:
set["Severity"].extract<int>() // is always 0
I'm obviously missing something in my code and an important part of the tutorial.
HEADER:
#ifndef ONEPRINT_LOGGER_H
#define ONEPRINT_LOGGER_H
#include <boost/log/core/core.hpp>
#include <boost/log/attributes/attribute_value_set.hpp>
#include <boost/log/trivial.hpp>
#include <boost/log/sources/severity_logger.hpp>
#include <boost/log/utility/setup/file.hpp>
#include <boost/log/utility/setup/console.hpp>
#include <boost/log/utility/setup/common_attributes.hpp>
#include <boost/log/sinks.hpp>
#include <boost/core/null_deleter.hpp>
#include <iostream>
namespace expr = boost::log::expressions;
namespace sources = boost::log::sources;
namespace sinks = boost::log::sinks;
namespace keywords = boost::log::keywords;
namespace ids {
enum severity_level
{
normal,
warning,
error,
critical
};
class Logger {
public:
Logger();
~Logger();
void logIt(std::string msg);
protected:
typedef sinks::asynchronous_sink<sinks::text_ostream_backend> asynchronousSink;
void setupLogging();
};
}
#endif //ONEPRINT_LOGGER_H
CPP:
#include "Logger.h"
class counter;
using namespace ids;
namespace { // NON-MEMBER METHODS
bool onlyWarnings(const boost::log::attribute_value_set& set)
{
return set["Severity"].extract<int>() > 0;
}
void severity_and_message(const boost::log::record_view &view, boost::log::formatting_ostream &os)
{
os << view.attribute_values()["Severity"].extract<int>() << ": " <<
view.attribute_values()["Message"].extract<std::string>();
}
}
Logger::Logger() {
setupLogging();
logIt("Testing");
}
Logger::~Logger() {
}
void Logger::setupLogging()
{
boost::shared_ptr< boost::log::core > core = boost::log::core::get();
boost::shared_ptr<sinks::text_ostream_backend> backend = boost::make_shared<sinks::text_ostream_backend>();
boost::shared_ptr<Logger::asynchronousSink> sink(new Logger::asynchronousSink(backend));
boost::shared_ptr<std::ostream> stream{&std::clog, boost::null_deleter{}};
sink->locked_backend()->add_stream(stream);
sink->set_filter(&onlyWarnings);
sink->set_formatter(&severity_and_message);
core->add_sink(sink);
}
void Logger::logIt(std::string msg) {
BOOST_LOG_TRIVIAL(warning) << msg;
sources::severity_logger<severity_level> severityLogger;
BOOST_LOG_SEV(severityLogger, critical) << msg;
}
Are you sure that severity is just another attribute? I would recommend that you start from a working example, like this one:
http://www.boost.org/doc/libs/1_56_0/libs/log/doc/html/log/tutorial/advanced_filtering.html
http://boost-log.sourceforge.net/libs/log/example/doc/tutorial_filtering.cpp
Did you get them working before you started your own coding? The tag-severity logger has an example filter that looks very different from yours.
bool my_filter(logging::value_ref< severity_level, tag::severity > const& level,
logging::value_ref< std::string, tag::tag_attr > const& tag)
{
return level >= warning || tag == "IMPORTANT_MESSAGE";
}
Perhaps try something more like:
bool my_filter(logging::value_ref< severity_level, tag::severity > const& level)
{
return level >= warning ;
}
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