As Horus pointed out, you can use attributes to log file and line numbers. However it is best to avoid using multi-statements macros to avoid problems with expressions like this:
if (something)
LOG_FILE_LINE(debug) << "It's true"; // Only the first statement is conditional!
You can do better creating a macro that leverages the underlying behavior of the Boost Log library. For example, BOOST_LOG_SEV is:
#define BOOST_LOG_SEV(logger, lvl) BOOST_LOG_STREAM_SEV(logger, lvl)
#define BOOST_LOG_STREAM_SEV(logger, lvl)
BOOST_LOG_STREAM_WITH_PARAMS((logger), (::boost::log::keywords::severity = (lvl)))
Using BOOST_LOG_STREAM_WITH_PARAMS you can set and get more attributes, like this:
// New macro that includes severity, filename and line number
#define CUSTOM_LOG(logger, sev)
BOOST_LOG_STREAM_WITH_PARAMS(
(logger),
(set_get_attrib("File", path_to_filename(__FILE__)))
(set_get_attrib("Line", __LINE__))
(::boost::log::keywords::severity = (boost::log::trivial::sev))
)
// Set attribute and return the new value
template<typename ValueType>
ValueType set_get_attrib(const char* name, ValueType value) {
auto attr = logging::attribute_cast<attrs::mutable_constant<ValueType>>(logging::core::get()->get_thread_attributes()[name]);
attr.set(value);
return attr.get();
}
// Convert file path to only the filename
std::string path_to_filename(std::string path) {
return path.substr(path.find_last_of("/")+1);
}
The complete source code is:
#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/expressions.hpp>
#include <boost/log/utility/setup/common_attributes.hpp>
#include <boost/log/attributes/mutable_constant.hpp>
#include <boost/date_time/posix_time/posix_time_types.hpp>
#include <boost/log/support/date_time.hpp>
#include <boost/log/attributes/mutable_constant.hpp>
namespace logging = boost::log;
namespace attrs = boost::log::attributes;
namespace expr = boost::log::expressions;
namespace src = boost::log::sources;
namespace keywords = boost::log::keywords;
// New macro that includes severity, filename and line number
#define CUSTOM_LOG(logger, sev)
BOOST_LOG_STREAM_WITH_PARAMS(
(logger),
(set_get_attrib("File", path_to_filename(__FILE__)))
(set_get_attrib("Line", __LINE__))
(::boost::log::keywords::severity = (boost::log::trivial::sev))
)
// Set attribute and return the new value
template<typename ValueType>
ValueType set_get_attrib(const char* name, ValueType value) {
auto attr = logging::attribute_cast<attrs::mutable_constant<ValueType>>(logging::core::get()->get_thread_attributes()[name]);
attr.set(value);
return attr.get();
}
// Convert file path to only the filename
std::string path_to_filename(std::string path) {
return path.substr(path.find_last_of("/")+1);
}
void init() {
// New attributes that hold filename and line number
logging::core::get()->add_thread_attribute("File", attrs::mutable_constant<std::string>(""));
logging::core::get()->add_thread_attribute("Line", attrs::mutable_constant<int>(0));
logging::add_file_log (
keywords::file_name = "sample.log",
keywords::format = (
expr::stream
<< expr::format_date_time<boost::posix_time::ptime>("TimeStamp", "%Y-%m-%d_%H:%M:%S.%f")
<< ": <" << boost::log::trivial::severity << "> "
<< '[' << expr::attr<std::string>("File")
<< ':' << expr::attr<int>("Line") << "] "
<< expr::smessage
)
);
logging::add_common_attributes();
}
int main(int argc, char* argv[]) {
init();
src::severity_logger<logging::trivial::severity_level> lg;
CUSTOM_LOG(lg, debug) << "A regular message";
return 0;
}
This generate a log like this:
2015-10-15_15:25:12.743153: <debug> [main.cpp:61] A regular message
