added logging module and a sandbox project

include/matador/logger/file_sink.hpp

@@ -0,0 +1,90 @@
+#ifndef MATADOR_FILE_SINK_HPP
+#define MATADOR_FILE_SINK_HPP
+
+#include "matador/logger/basic_file_sink.hpp"
+
+#include <string>
+#include <stdexcept>
+
+namespace matador::logger {
+
+/**
+ * @brief A file sink writing the log message to one file
+ *
+ * The log sink writes all log messages to one single
+ * file identified by a given path.
+ *
+ * Note because there is no limit, the file grows infinitely.
+ */
+class file_sink final : public basic_file_sink
+{
+public:
+  /**
+   * Creates a file_sink with the given path.
+   * If the path doesn't exist, it is created.
+   *
+   * @param path The log file to write to
+   */
+  explicit file_sink(const std::string &path);
+
+  /**
+   * Creates a file_sink with the given path.
+   * If the path doesn't exist, it is created.
+   *
+   * @param path The log file to write to
+   */
+  explicit file_sink(const char *path);
+
+  /**
+   * Destroys the file_sink
+   */
+  ~file_sink() override;
+
+  /**
+   * Returns the path to the log file.
+   *
+   * @return The path to the log file
+   */
+  std::string path() const;
+
+private:
+  std::string path_;
+};
+
+/**
+ * @brief Log sink writing to stdout
+ *
+ * This log sink writes all messages to stdout.
+ */
+class stdout_sink final : public basic_file_sink
+{
+public:
+  stdout_sink();
+  ~stdout_sink() override = default;
+
+  /**
+   * Do nothing on close
+   */
+  void close() override {}
+};
+
+/**
+ * @brief Log sink writing to stderr
+ *
+ * This log sink writes all messages to stderr.
+ */
+class stderr_sink final : public basic_file_sink
+{
+public:
+  stderr_sink();
+  ~stderr_sink() override = default;
+
+  /**
+   * Do nothing on close
+   */
+  void close() override {}
+};
+
+}
+
+#endif //MATADOR_FILE_SINK_HPP