尝试基本boost.log示例,但失败
我将boost.log v2集成到我的项目中。该平台是带VS2017的Windows 10。该程序被编译为目标X64。
#include <boost/thread/mutex.hpp>
#include <boost/core/null_deleter.hpp>
#include <boost/log/common.hpp>
#include <boost/log/core.hpp>
#include <boost/log/trivial.hpp>
#include <boost/log/attributes.hpp>
#include <boost/log/exceptions.hpp>
#include <boost/log/sources/record_ostream.hpp>
#include <boost/log/sinks.hpp>
void test(){
boost::log::sources::severity_logger<severity_level> slg1;
slg1.open_record(); // this is ok
slg1.open_record(normal); // this line failed at next code
}
template< typename BaseT, typename LevelT = int >
class basic_severity_logger : public BaseT
{
template< typename ArgsT >
record open_record_unlocked(ArgsT const& args)
{
// !!! error at here !!!
// because "normal" is an enum variable that doesn't support "operator[]"
m_SeverityAttr.set_value(args[keywords::severity | m_DefaultSeverity]);
return base_type::open_record_unlocked(args);
}
};
实际上,我不知道basic_severity_logger
是如何称呼的?
// logger with multithread supported
boost::log::sources::severity_logger_mt<severity_level> slg;
slg.open_record(); // failed with "no member named 'open_record' in severity_logger_mt<...>"
slg.open_record(DEBUG); // failed with "no member named 'open_record' in severity_logger_mt<...>"
当前,该代码在Compling Step中失败,尚未达到链接阶段。
我尝试过BOOST-1.64,BOOST-1.68和BOOST-1.70,问题仍然相同
有人可以帮我吗?
代码第一部分的错误mesage
D:librariesboostboost_1_70_0boost/log/sources/severity_feature.hpp(252): error C2676: binary “[”:“const ArgsT”does not define this operator or a conversion to a type acceptable to the predefined operator
with
[
ArgsT=severity_level
]
谢谢大家,伙计们。我知道如何解决它,但是我还不知道为什么。
修改代码如下:
boost::log::sources::severity_logger<boost::log::trivial::severity_level> slg1;
slg1.open_record();
BOOST_LOG_SEV(slg1, boost::log::trivial::trace) << "A regular message";
slg1.open_record(boost::log::keywords::severity=boost::log::trivial::trace);
boost::log::sources::severity_logger_mt<boost::log::trivial::severity_level> slg;
slg.open_record();
slg.open_record(boost::log::keywords::severity=boost::log::trivial::trace);
关键是使用的参数boost::log::keywords::severity
slg1.open_record(boost::log::keywords::severity=boost::log::trivial::trace);
有人告诉我它如何工作?boost::log::keywords::severity
是功能对象还是其他对象?