log: ensure __LINE__ is evaluated in log var (8ce48f3b) · Commits · XRFLab109 / Allpix Squared

src/core/utils/log.h

+11 −7

Original line number	Diff line number	Diff line
		@@ -275,13 +275,17 @@ namespace allpix {
		*/
		#define LOG_ONCE(level) LOG_N(level, 1)

		///@{
		/**
		* @brief Generator for a local variable to hold the logging count of a message
		* @param Count Number of allowed counts
		* @return Local counter variable
		* @brief Macros to generate and retrieve line-specific local variables to hold the logging count of a message
		*
		* Note: the double concat macro is needed to ensure __LINE__ is evaluated, see https://stackoverflow.com/a/19666216/17555746
		*/
		#define GENERATE_LOG_VAR(Count) static std::atomic<int> local___FUNCTION__##Count##__LINE__(Count)
		#define GET_LOG_VARIABLE(Count) local___FUNCTION__##Count##__LINE__
		#define CONCAT_IMPL(x, y) x##y
		#define CONCAT(x, y) CONCAT_IMPL(x, y)
		#define GENERATE_LOG_VAR(Count) static std::atomic<int> CONCAT(local___FUNCTION__, __LINE__) {Count}
		#define GET_LOG_VARIABLE() CONCAT(local___FUNCTION__, __LINE__)
		///@}

		/**
		* @brief Create a logging stream if the reporting level is high enough and this message has not yet been logged more than
		@@ -291,11 +295,11 @@ namespace allpix {
		*/
		#define LOG_N(level, max_log_count) \
		GENERATE_LOG_VAR(max_log_count); \
		if(GET_LOG_VARIABLE(max_log_count) > 0) \
		if(GET_LOG_VARIABLE() > 0) \
		if(allpix::LogLevel::level <= allpix::Log::getReportingLevel() && !allpix::Log::getStreams().empty()) \
		allpix::Log().getStream( \
		allpix::LogLevel::level, __FILE_NAME__, std::string(static_cast<const char*>(__func__)), __LINE__) \
		<< std::string(--GET_LOG_VARIABLE(max_log_count) == 0 ? "[further messages suppressed] " : "")
		<< std::string(--GET_LOG_VARIABLE() == 0 ? "[further messages suppressed] " : "")

		/**
		* @brief Suppress a stream from writing any output