Method unsupported

cpp/fory/util/error.h:158–160

Creates an unsupported operation error.

  /// Creates an unsupported operation error.
  static Error unsupported(const std::string &msg) {
    return Error(ErrorCode::Unsupported, msg);
  }

  /// Creates a not allowed operation error.
  static Error not_allowed(const std::string &msg) {