How do I roll log files and control sizes in C++?

Rolling log files is a technique used in software development to manage log file sizes and maintain organization. In C++, you can implement rolling log files by creating a logging mechanism that checks the size of the log file and rolls over when it reaches a specified limit.

Here’s a simple example of how to roll log files and control their sizes in C++:


        #include 
        #include 
        #include 
        #include 
        #include 

        class Logger {
        private:
            std::string filename;
            size_t max_size;
            size_t current_size;

        public:
            Logger(const std::string& name, size_t size) : filename(name), max_size(size), current_size(0) {
                std::ifstream file(filename, std::ifstream::ate);
                current_size = file.tellg();
            }

            void log(const std::string& message) {
                if (current_size >= max_size) {
                    roll_log();
                }
                std::ofstream log_file(filename, std::ios::app);
                log_file << get_current_time() << ": " << message << std::endl;
                current_size += message.size() + 18; // Approx for timestamp
            }

            void roll_log() {
                std::string new_filename = filename + "." + get_current_time_suffix();
                std::rename(filename.c_str(), new_filename.c_str());
                std::ofstream log_file(filename, std::ios::trunc);
                current_size = 0;
            }

            std::string get_current_time() {
                std::time_t t = std::time(nullptr);
                char buf[100];
                std::strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", std::localtime(&t));
                return buf;
            }

            std::string get_current_time_suffix() {
                std::time_t t = std::time(nullptr);
                char buf[20];
                std::strftime(buf, sizeof(buf), "%Y%m%d%H%M%S", std::localtime(&t));
                return buf;
            }
        };

        int main() {
            Logger logger("logfile.txt", 1024); // Set max size to 1024 bytes
            logger.log("This is a log message.");
            return 0;
        }

How do I roll log files and control sizes in C++?

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How do I roll log files and control sizes in C++?

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