Add Error struct and error defining macro

src/FileSystem/Error/Error.hpp

@@ -0,0 +1,32 @@
+#pragma once
+
+#include <string>
+#include <utility>
+
+struct Error {
+  virtual ~Error() = default;
+  Error() = default;
+  Error(const Error &) = default;
+  Error(Error &&) = default;
+  auto operator=(const Error &) -> Error & = delete;
+  auto operator=(Error &&) -> Error & = delete;
+
+  explicit Error(std::string in_message) : message(std::move(in_message)) {}
+  [[nodiscard]] auto get_error_type() const noexcept -> std::string { // NOLINT (bugprone-exception-escape)
+    return "Error";
+  }
+
+  [[nodiscard]] auto what() const noexcept -> std::string { return get_error_type() + ": " + message; }
+
+private:
+  std::string message;
+};
+
+#define DEFINE_ERROR_TYPE(name) /* NOLINT (cppcoreguidelines-macro-usage) */                                           \
+  struct name##Err : public Error {                                                                                    \
+    explicit name##Err(std::string in_message) : Error(std::move(in_message)) {}                                       \
+    [[nodiscard]] auto get_error_type() const noexcept /* NOLINT (bugprone-exception-escape) */                        \
+        -> std::string {                                                                                               \
+      return #name;                                                                                                    \
+    }                                                                                                                  \
+  };