initial matador ng commit

source/core/object/error_code.cpp

@@ -0,0 +1,37 @@
+#include "matador/object/error_code.hpp"
+
+namespace matador::object {
+
+const char * object_category_impl::name() const noexcept {
+  return "sql";
+}
+
+std::string object_category_impl::message(const int ev) const {
+  switch (static_cast<error_code>(ev)) {
+    case error_code::OK:
+      return "OK";
+    case error_code::NodeNotFound:
+      return "Node not found";
+    case error_code::NodeAlreadyExists:
+      return "Node already exists";
+    case error_code::Failure:
+      return "Failure";
+    default:
+      return "Unknown error";
+  }
+}
+
+const std::error_category & object_category() {
+  static object_category_impl instance;
+  return instance;
+}
+
+std::error_code make_error_code(error_code e) {
+  return {static_cast<int>(e), object_category()};
+}
+
+std::error_condition make_error_condition(error_code e) {
+  return {static_cast<int>(e), object_category()};
+}
+
+}