Use range-based fors in src/cpp/{client,server}

src/cpp/client/secure_credentials.cc

@@ -262,11 +262,9 @@ std::shared_ptr<ChannelCredentials> AltsCredentials(
   grpc::GrpcLibraryCodegen init;  // To call grpc_init().
   grpc_alts_credentials_options* c_options =
       grpc_alts_credentials_client_options_create();
-  for (auto service_account = options.target_service_accounts.begin();
-       service_account != options.target_service_accounts.end();
-       service_account++) {
+  for (const auto& service_account : options.target_service_accounts) {
     grpc_alts_credentials_client_options_add_target_service_account(
-        c_options, service_account->c_str());
+        c_options, service_account.c_str());
   }
   grpc_channel_credentials* c_creds = grpc_alts_credentials_create(c_options);
   grpc_alts_credentials_options_destroy(c_options);
@@ -439,9 +437,9 @@ int MetadataCredentialsPluginWrapper::GetMetadata(
 namespace {
 
 void UnrefMetadata(const std::vector<grpc_metadata>& md) {
-  for (auto it = md.begin(); it != md.end(); ++it) {
-    grpc_slice_unref(it->key);
-    grpc_slice_unref(it->value);
+  for (const auto& metadatum : md) {
+    grpc_slice_unref(metadatum.key);
+    grpc_slice_unref(metadatum.value);
   }
 }
 
@@ -461,10 +459,10 @@ void MetadataCredentialsPluginWrapper::InvokePlugin(
   Status status = plugin_->GetMetadata(context.service_url, context.method_name,
                                        cpp_channel_auth_context, &metadata);
   std::vector<grpc_metadata> md;
-  for (auto it = metadata.begin(); it != metadata.end(); ++it) {
+  for (auto& metadatum : metadata) {
     grpc_metadata md_entry;
-    md_entry.key = SliceFromCopiedString(it->first);
-    md_entry.value = SliceFromCopiedString(it->second);
+    md_entry.key = SliceFromCopiedString(metadatum.first);
+    md_entry.value = SliceFromCopiedString(metadatum.second);
     md_entry.flags = 0;
     md.push_back(md_entry);
   }

src/cpp/server/secure_server_credentials.cc

@@ -69,20 +69,18 @@ void AuthMetadataProcessorAyncWrapper::InvokeProcessor(
                                       &response_metadata);
 
   std::vector<grpc_metadata> consumed_md;
-  for (auto it = consumed_metadata.begin(); it != consumed_metadata.end();
-       ++it) {
+  for (const auto& consumed : consumed_metadata) {
     grpc_metadata md_entry;
-    md_entry.key = SliceReferencingString(it->first);
-    md_entry.value = SliceReferencingString(it->second);
+    md_entry.key = SliceReferencingString(consumed.first);
+    md_entry.value = SliceReferencingString(consumed.second);
     md_entry.flags = 0;
     consumed_md.push_back(md_entry);
   }
   std::vector<grpc_metadata> response_md;
-  for (auto it = response_metadata.begin(); it != response_metadata.end();
-       ++it) {
+  for (const auto& response : response_metadata) {
     grpc_metadata md_entry;
-    md_entry.key = SliceReferencingString(it->first);
-    md_entry.value = SliceReferencingString(it->second);
+    md_entry.key = SliceReferencingString(response.first);
+    md_entry.value = SliceReferencingString(response.second);
     md_entry.flags = 0;
     response_md.push_back(md_entry);
   }
@@ -113,10 +111,9 @@ void SecureServerCredentials::SetAuthMetadataProcessor(
 std::shared_ptr<ServerCredentials> SslServerCredentials(
     const grpc::SslServerCredentialsOptions& options) {
   std::vector<grpc_ssl_pem_key_cert_pair> pem_key_cert_pairs;
-  for (auto key_cert_pair = options.pem_key_cert_pairs.begin();
-       key_cert_pair != options.pem_key_cert_pairs.end(); key_cert_pair++) {
-    grpc_ssl_pem_key_cert_pair p = {key_cert_pair->private_key.c_str(),
-                                    key_cert_pair->cert_chain.c_str()};
+  for (const auto& key_cert_pair : options.pem_key_cert_pairs) {
+    grpc_ssl_pem_key_cert_pair p = {key_cert_pair.private_key.c_str(),
+                                    key_cert_pair.cert_chain.c_str()};
     pem_key_cert_pairs.push_back(p);
   }
   grpc_server_credentials* c_creds = grpc_ssl_server_credentials_create_ex(

src/cpp/server/server_builder.cc

@@ -269,8 +269,8 @@ std::unique_ptr<grpc::Server> ServerBuilder::BuildAndStart() {
                       std::vector<std::unique_ptr<ServerCompletionQueue>>>());
 
   bool has_frequently_polled_cqs = false;
-  for (auto it = cqs_.begin(); it != cqs_.end(); ++it) {
-    if ((*it)->IsFrequentlyPolled()) {
+  for (const auto& cq : cqs_) {
+    if (cq->IsFrequentlyPolled()) {
       has_frequently_polled_cqs = true;
       break;
     }
@@ -278,8 +278,8 @@ std::unique_ptr<grpc::Server> ServerBuilder::BuildAndStart() {
 
   // == Determine if the server has any callback methods ==
   bool has_callback_methods = false;
-  for (auto it = services_.begin(); it != services_.end(); ++it) {
-    if ((*it)->service->has_callback_methods()) {
+  for (const auto& service : services_) {
+    if (service->service->has_callback_methods()) {
       has_callback_methods = true;
       has_frequently_polled_cqs = true;
       break;
@@ -382,15 +382,15 @@ std::unique_ptr<grpc::Server> ServerBuilder::BuildAndStart() {
   }
 
   bool added_port = false;
-  for (auto port = ports_.begin(); port != ports_.end(); port++) {
-    int r = server->AddListeningPort(port->addr, port->creds.get());
+  for (auto& port : ports_) {
+    int r = server->AddListeningPort(port.addr, port.creds.get());
     if (!r) {
       if (added_port) server->Shutdown();
       return nullptr;
     }
     added_port = true;
-    if (port->selected_port != nullptr) {
-      *port->selected_port = r;
+    if (port.selected_port != nullptr) {
+      *port.selected_port = r;
     }
   }
 

src/cpp/server/server_cc.cc

@@ -1083,16 +1083,14 @@ bool Server::RegisterService(const grpc::string* host, grpc::Service* service) {
 
   const char* method_name = nullptr;
 
-  for (auto it = service->methods_.begin(); it != service->methods_.end();
-       ++it) {
-    if (it->get() == nullptr) {  // Handled by generic service if any.
+  for (const auto& method : service->methods_) {
+    if (method.get() == nullptr) {  // Handled by generic service if any.
       continue;
     }
 
-    grpc::internal::RpcServiceMethod* method = it->get();
     void* method_registration_tag = grpc_server_register_method(
         server_, method->name(), host ? host->c_str() : nullptr,
-        PayloadHandlingForMethod(method), 0);
+        PayloadHandlingForMethod(method.get()), 0);
     if (method_registration_tag == nullptr) {
       gpr_log(GPR_DEBUG, "Attempt to register %s multiple times",
               method->name());
@@ -1104,7 +1102,7 @@ bool Server::RegisterService(const grpc::string* host, grpc::Service* service) {
     } else if (method->api_type() ==
                grpc::internal::RpcServiceMethod::ApiType::SYNC) {
       for (const auto& value : sync_req_mgrs_) {
-        value->AddSyncMethod(method, method_registration_tag);
+        value->AddSyncMethod(method.get(), method_registration_tag);
       }
     } else {
       // a callback method. Register at least some callback requests
@@ -1113,8 +1111,8 @@ bool Server::RegisterService(const grpc::string* host, grpc::Service* service) {
       // TODO(vjpai): Register these dynamically based on need
       for (int i = 0; i < DEFAULT_CALLBACK_REQS_PER_METHOD; i++) {
         callback_reqs_to_start_.push_back(
-            new CallbackRequest<grpc::ServerContext>(this, method_index, method,
-                                                     method_registration_tag));
+            new CallbackRequest<grpc::ServerContext>(
+                this, method_index, method.get(), method_registration_tag));
       }
       // Enqueue it so that it will be Request'ed later after all request
       // matchers are created at core server startup