Boost记录器的深拷贝

如何解决Boost记录器的深拷贝

如何制作 boost::log::sources::severity_channel_logger_mt 对象的深层副本？

我需要具有指定通道的新记录器实例以及来自源记录器的所有属性的副本。

using namespace boost::log;
using Logger = sources::severity_channel_logger_mt<trivial::severity_level,std::string>;

Logger orig {keywords::channel = "LL"};
orig.add_attribute("tid",attributes::constant<std::string>("TT"));

// This constructor does not affect orig but does not inherit attributes
Logger l0 {orig,keywords::channel = "L0"};
l0.add_attribute("attr",attributes::constant<std::string>("0A"));

// copy constructor affects orig
Logger l1 {orig};
l1.channel("L1"); // Bad. It right sets l1 channel but affects the orig's channel
l1.add_attribute("attr",attributes::constant<std::string>("1B"));

Boost 版本是 1.66