不正确的 Boost Log 时间戳格式答案

【问题标题】：incorrect Boost Log timestamp format不正确的 Boost Log 时间戳格式
【发布时间】：2013-09-13 08:21:37
【问题描述】：

我正在使用 Boost 1.54 Log，并通过以下方式初始化我的日志记录：

namespace logging = boost::log;
namespace src = boost::log::sources;
namespace expr = boost::log::expressions;
namespace sinks = boost::log::sinks;
namespace attrs = boost::log::attributes;
namespace keywords = boost::log::keywords;

BOOST_LOG_ATTRIBUTE_KEYWORD(line_id, "LineID", unsigned int)
BOOST_LOG_ATTRIBUTE_KEYWORD(severity, "Severity", severity_level)
BOOST_LOG_ATTRIBUTE_KEYWORD(tag_attr, "Tag", std::string)
BOOST_LOG_ATTRIBUTE_KEYWORD(timestamp, "TimeStamp", boost::posix_time::ptime)

logging::add_common_attributes();
boost::shared_ptr<logging::core> core = logging::core::get();

// setup console log
logging::add_console_log (
    std::clog,
    keywords::filter = severity >= debug,
    keywords::format = (
        expr::stream << expr::format_date_time(timestamp, "%Y-%m-%d %H:%M:%S") <<
            line_id << " [" << severity << "] " << expr::smessage
    )
);

这是生成输出的示例：

2013-09-13 10:17:471 [warn] You are running in debug mode - assertions are enabled.
2013-09-13 10:17:472 [info] loading data completed
2013-09-13 10:17:473 [debug] applying xxx completed
2013-09-13 10:17:474 [debug] computing xxx completed
2013-09-13 10:17:475 [debug] xxx completed
2013-09-13 10:17:476 [info] xxx completed
2013-09-13 10:17:477 [debug] xxx completed
2013-09-13 10:17:478 [debug] computing xxx completed
2013-09-13 10:17:479 [info] testing xxx completed
2013-09-13 10:17:4710 [info] xxx
2013-09-13 10:17:4711 [debug] xxx completed

时间戳的输出秒数完全不正确，但根据 Boost Log 文档%S 是正确的秒数格式设置。这会是一个错误吗？

【问题讨论】：

请添加包含的标题以让其他人使用 MWE。我偶然发现了namespace definition not allowedBOOST_LOG_ATTRIBUTE_KEYWORD(line_id, "LineID", unsigned int)

标签： c++ logging boost boost-log

【解决方案1】：

时间和line_id 之间没有空格，所以它们一起运行。

【讨论】：

【解决方案2】：

否则用以下代码替换keywords::format：

 /*< log record format >*/
    keywords::format =
    (
        expr::stream
        //<< std::hex   //To print the LineID in Hexadecimal format
        << std::setw(8) << std::setfill('0') 
        << expr::attr< unsigned int >("LineID")
        << "\t"
        << expr::format_date_time<boost::posix_time::ptime>("TimeStamp","%H:%M:%S.%f")
        << "\t: <" << logging::trivial::severity
        << "> \t" << expr::smessage
    )

【讨论】：