1 files changed, 41 insertions, 0 deletions
diff --git a/src/logger.hh b/src/logger.hh
new file mode 100644
index 0000000..5c1e599
--- /dev/null
+++ b/src/logger.hh
@@ -0,0 +1,41 @@
+#ifndef LOGGER_HH
+#define LOGGER_HH
+
+#include <memory>
+#include <string>
+#include <string_view>
+
+namespace logger {
+
+class Logger {
+ public:
+  virtual ~Logger() = default;
+
+  virtual void err(std::string_view message) = 0;
+  virtual void warn(std::string_view message) = 0;
+  virtual void info(std::string_view message) = 0;
+
+#if defined(NDEBUG)
+  void dbg(std::string_view) {}
+#else
+  virtual void dbg(std::string_view message) = 0;
+#endif
+
+ protected:
+  Logger() = default;
+  Logger(Logger const&) = delete;
+  Logger& operator=(Logger const&) = delete;
+};
+
+[[nodiscard]]
+std::unique_ptr<Logger> noop();
+
+[[nodiscard]]
+std::unique_ptr<Logger> syslog(std::string ident, bool verbose = false);
+
+[[nodiscard]]
+std::unique_ptr<Logger> stderr(bool verbose = false);
+
+}  // namespace logger
+
+#endif  // LOGGER_HH