event_logger.h

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class NOVTABLE event_logger : public service_base {
    FB2K_MAKE_SERVICE_INTERFACE(event_logger, service_base);
public:
    enum {
        severity_status,
        severity_warning,
        severity_error
    };
    void log_status(const char * line) {log_entry(line, severity_status);}
    void log_warning(const char * line) {log_entry(line, severity_warning);}
    void log_error(const char * line) {log_entry(line, severity_error);}
    
    virtual void log_entry(const char * line, unsigned severity) = 0;
};

class event_logger_fallback : public event_logger {
public:
    void log_entry(const char * line, unsigned) {console::print(line);}
};