@@ -473,7 +473,7 @@ Status ClientGenerator::GenerateCc() {
473473 CcPrint (R"""(
474474 std::shared_ptr<$connection_class_name$> connection, Options opts)
475475 : connection_(std::move(connection)),
476- options_(internal::MergeOptions (std::move(opts),
476+ options_($merge_options_fn$ (std::move(opts),
477477 connection_->options())) {}
478478$client_class_name$::~$client_class_name$() = default;
479479)""" );
@@ -488,7 +488,7 @@ std::unique_ptr<::google::cloud::AsyncStreamingReadWriteRpc<
488488 $response_type$>>
489489$client_class_name$::Async$method_name$(Options opts) {
490490 internal::OptionsSpan span(
491- internal::MergeOptions (std::move(opts), options_));
491+ $merge_options_fn$ (std::move(opts), options_));
492492 return connection_->Async$method_name$();
493493}
494494)""" );
@@ -513,7 +513,7 @@ std::unique_ptr<::google::cloud::AsyncStreamingReadWriteRpc<
513513 {" \n $return_type$\n " },
514514 // clang-format off
515515 {method_string},
516- {" internal::OptionsSpan span(internal::MergeOptions ("
516+ {" internal::OptionsSpan span($merge_options_fn$ ("
517517 " std::move(opts), options_));\n " },
518518 {" $request_type$ request;\n " },
519519 {method_request_string},
@@ -529,7 +529,7 @@ std::unique_ptr<::google::cloud::AsyncStreamingReadWriteRpc<
529529 " \n future<Status>\n " ,
530530 " \n future<StatusOr<$longrunning_deduced_response_type$>>\n " },
531531 {method_string},
532- {" internal::OptionsSpan span(internal::MergeOptions ("
532+ {" internal::OptionsSpan span($merge_options_fn$ ("
533533 " std::move(opts), options_));\n " },
534534 {" $request_type$ request;\n " },
535535 {method_request_string},
@@ -541,7 +541,7 @@ std::unique_ptr<::google::cloud::AsyncStreamingReadWriteRpc<
541541 " \n Status\n " ,
542542 " \n StatusOr<$longrunning_operation_type$>\n " },
543543 {start_method_string},
544- {" internal::OptionsSpan span(internal::MergeOptions ("
544+ {" internal::OptionsSpan span($merge_options_fn$ ("
545545 " std::move(opts), options_));\n " },
546546 {" $request_type$ request;\n " },
547547 {method_request_string},
@@ -554,7 +554,7 @@ std::unique_ptr<::google::cloud::AsyncStreamingReadWriteRpc<
554554 // clang-format off
555555 {" \n StreamRange<$range_output_type$>\n " },
556556 {method_string},
557- {" internal::OptionsSpan span(internal::MergeOptions ("
557+ {" internal::OptionsSpan span($merge_options_fn$ ("
558558 " std::move(opts), options_));\n " },
559559 {" $request_type$ request;\n " },
560560 {method_request_string},
@@ -567,7 +567,7 @@ std::unique_ptr<::google::cloud::AsyncStreamingReadWriteRpc<
567567 // clang-format off
568568 {" \n StreamRange<$response_type$>\n " },
569569 {method_string},
570- {" internal::OptionsSpan span(internal::MergeOptions ("
570+ {" internal::OptionsSpan span($merge_options_fn$ ("
571571 " std::move(opts), options_));\n " },
572572 {" $request_type$ request;\n " },
573573 {method_request_string},
@@ -591,7 +591,7 @@ std::unique_ptr<::google::cloud::AsyncStreamingReadWriteRpc<
591591 " Options opts) {\n "
592592 " internal::CheckExpectedOptions<$service_name$"
593593 " BackoffPolicyOption>(opts, __func__);\n "
594- " internal::OptionsSpan span(internal::MergeOptions ("
594+ " internal::OptionsSpan span($merge_options_fn$ ("
595595 " std::move(opts), options_));\n " },
596596 {" " },
597597 {ProtoNameToCppName (
@@ -644,7 +644,7 @@ std::unique_ptr<::google::cloud::AsyncStreamingReadWriteRpc<
644644 // clang-format off
645645 {" $client_class_name$::$method_name$($request_type$ const& request"
646646 " , Options opts) {\n "
647- " internal::OptionsSpan span(internal::MergeOptions ("
647+ " internal::OptionsSpan span($merge_options_fn$ ("
648648 " std::move(opts), options_));\n "
649649 " return connection_->$method_name$(request);\n "
650650 " }\n " } // clang-format on
@@ -659,7 +659,7 @@ std::unique_ptr<::google::cloud::AsyncStreamingReadWriteRpc<
659659 " \n future<StatusOr<$longrunning_deduced_response_type$>>\n " },
660660 {" $client_class_name$::$method_name$($request_type$ const& request"
661661 " , Options opts) {\n "
662- " internal::OptionsSpan span(internal::MergeOptions ("
662+ " internal::OptionsSpan span($merge_options_fn$ ("
663663 " std::move(opts), options_));\n "
664664 " return connection_->$method_name$(request);\n "
665665 " }\n " },
@@ -671,7 +671,7 @@ std::unique_ptr<::google::cloud::AsyncStreamingReadWriteRpc<
671671 {" $client_class_name$::$method_name$(NoAwaitTag"
672672 " , $request_type$ const& request"
673673 " , Options opts) {\n "
674- " internal::OptionsSpan span(internal::MergeOptions ("
674+ " internal::OptionsSpan span($merge_options_fn$ ("
675675 " std::move(opts), options_));\n "
676676 " return connection_->$method_name$(NoAwaitTag{}, request);\n "
677677 " }\n " },
@@ -682,7 +682,7 @@ std::unique_ptr<::google::cloud::AsyncStreamingReadWriteRpc<
682682 " \n future<StatusOr<$longrunning_deduced_response_type$>>\n " },
683683 {" $client_class_name$::$method_name$("
684684 " $longrunning_operation_type$ const& operation, Options opts) {\n "
685- " internal::OptionsSpan span(internal::MergeOptions ("
685+ " internal::OptionsSpan span($merge_options_fn$ ("
686686 " std::move(opts), options_));\n "
687687 " return connection_->$method_name$(operation);\n " },
688688 {" }\n " } // clang-format on
@@ -694,7 +694,7 @@ std::unique_ptr<::google::cloud::AsyncStreamingReadWriteRpc<
694694 {" \n StreamRange<$range_output_type$>\n "
695695 " $client_class_name$::$method_name$($request_type$ request"
696696 " , Options opts) {\n "
697- " internal::OptionsSpan span(internal::MergeOptions ("
697+ " internal::OptionsSpan span($merge_options_fn$ ("
698698 " std::move(opts), options_));\n "
699699 " return connection_->$method_name$(std::move(request));\n "
700700 " }\n " } // clang-format on
@@ -706,7 +706,7 @@ std::unique_ptr<::google::cloud::AsyncStreamingReadWriteRpc<
706706 {" \n StreamRange<$response_type$>\n "
707707 " $client_class_name$::$method_name$($request_type$ const& request"
708708 " , Options opts) {\n "
709- " internal::OptionsSpan span(internal::MergeOptions ("
709+ " internal::OptionsSpan span($merge_options_fn$ ("
710710 " std::move(opts), options_));\n "
711711 " return connection_->$method_name$(request);\n "
712712 " }\n " } // clang-format on
@@ -733,7 +733,7 @@ std::unique_ptr<::google::cloud::AsyncStreamingReadWriteRpc<
733733 {" \n future<$return_type$>\n " },
734734 // clang-format off
735735 {method_string},
736- {" internal::OptionsSpan span(internal::MergeOptions ("
736+ {" internal::OptionsSpan span($merge_options_fn$ ("
737737 " std::move(opts), options_));\n " },
738738 {" $request_type$ request;\n " },
739739 {method_request_string},
@@ -752,7 +752,7 @@ std::unique_ptr<::google::cloud::AsyncStreamingReadWriteRpc<
752752 // clang-format off
753753 {" $client_class_name$::Async$method_name$($request_type$ const& request"
754754 " , Options opts) {\n "
755- " internal::OptionsSpan span(internal::MergeOptions ("
755+ " internal::OptionsSpan span($merge_options_fn$ ("
756756 " std::move(opts), options_));\n "
757757 " return connection_->Async$method_name$(request);\n "
758758 " }\n " } // clang-format on
@@ -768,7 +768,7 @@ std::unique_ptr<::google::cloud::AsyncStreamingReadWriteRpc<
768768 method.return_type (), R"""( $client_class_name$::)""" , method.name (),
769769 absl::StrReplaceAll (method.parameters (), {{" = {}" , " " }}),
770770 absl::StrFormat (R"""( {
771- internal::OptionsSpan span(internal::MergeOptions (std::move(opts), options_));
771+ internal::OptionsSpan span($merge_options_fn$ (std::move(opts), options_));
772772 return connection_->%s(request);
773773}
774774)""" ,
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