null logger

Author: andiwand

src/odr/logger.cpp

@@ -10,6 +10,16 @@ namespace odr {
 
 namespace {
 
+class NullLogger : public Logger {
+public:
+  [[nodiscard]] bool will_log(LogLevel) const override { return false; }
+
+  void log_impl(LogLevel, const std::string &,
+                const std::source_location &) override {
+    // Do nothing
+  }
+};
+
 class StdioLogger : public Logger {
 public:
   StdioLogger(std::string name, LogLevel level, LogFormat format,
@@ -84,6 +94,11 @@ std::string_view level_to_string(LogLevel level) {
 
 } // namespace
 
+Logger &Logger::null() {
+  static NullLogger null_logger;
+  return null_logger;
+}
+
 std::unique_ptr<Logger>
 Logger::create_stdio(const std::string &name, LogLevel level,
                      const LogFormat &format,

src/odr/logger.hpp

@@ -40,6 +40,7 @@ struct LogFormat {
 
 class Logger {
 public:
+  static Logger &null();
   static std::unique_ptr<Logger>
   create_stdio(const std::string &name, LogLevel level,
                const LogFormat &format = LogFormat(),