Method Evaluate

codelab/solutions/exercise4.cc:134–149

  }

  absl::StatusOr<bool> Evaluate(const CheckedExpr& expr,
                                const AttributeContext& context) {
    Activation activation;
    CEL_RETURN_IF_ERROR(BindProtoToActivation(&context, &arena_, &activation));
    CEL_ASSIGN_OR_RETURN(auto plan, builder_->CreateExpression(&expr));
    CEL_ASSIGN_OR_RETURN(CelValue result, plan->Evaluate(activation, &arena_));

    if (bool value; result.GetValue(&value)) {
      return value;
    } else if (const CelError* value; result.GetValue(&value)) {
      return *value;
    } else {
      return absl::InvalidArgumentError(
          absl::StrCat("unexpected return type: ", result.DebugString()));
    }
  }

 private:
  google::protobuf::Arena arena_;