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				@@ -60,8 +60,6 @@ using std::make_pair; 
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				 using std::map; 
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				 using std::pair; 
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				 using std::replace; 
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				-using std::string; 
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				-using std::strlen; 
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				 using std::vector; 
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				 namespace grpc_python_generator { 
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				@@ -72,14 +70,14 @@ namespace { 
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				 // Converts an initializer list of the form { key0, value0, key1, value1, ... } 
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				 // into a map of key* to value*. Is merely a readability helper for later code. 
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				-map<string, string> ListToDict(const initializer_list<string>& values) { 
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				+map<std::string, std::string> ListToDict(const initializer_list<std::string>& values) { 
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				   assert(values.size() % 2 == 0); 
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				-  map<string, string> value_map; 
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				+  map<std::string, std::string> value_map; 
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				   auto value_iter = values.begin(); 
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				   for (unsigned i = 0; i < values.size()/2; ++i) { 
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				-    string key = *value_iter; 
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				+    std::string key = *value_iter; 
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				     ++value_iter; 
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				-    string value = *value_iter; 
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				+    std::string value = *value_iter; 
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				     value_map[key] = value; 
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				     ++value_iter; 
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				   } 
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				@@ -113,8 +111,8 @@ class IndentScope { 
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				 bool PrintServicer(const ServiceDescriptor* service, 
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				                    Printer* out) { 
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				-  string doc = "<fill me in later!>"; 
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				-  map<string, string> dict = ListToDict({ 
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				+  std::string doc = "<fill me in later!>"; 
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				+  map<std::string, std::string> dict = ListToDict({ 
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				         "Service", service->name(), 
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				         "Documentation", doc, 
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				       }); 
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				@@ -125,7 +123,7 @@ bool PrintServicer(const ServiceDescriptor* service, 
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				     out->Print("__metaclass__ = abc.ABCMeta\n"); 
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				     for (int i = 0; i < service->method_count(); ++i) { 
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				       auto meth = service->method(i); 
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				-      string arg_name = meth->client_streaming() ? 
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				+      std::string arg_name = meth->client_streaming() ? 
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				           "request_iterator" : "request"; 
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				       out->Print("@abc.abstractmethod\n"); 
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				       out->Print("def $Method$(self, $ArgName$, context):\n", 
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				@@ -140,8 +138,8 @@ bool PrintServicer(const ServiceDescriptor* service, 
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				 } 
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				 bool PrintServer(const ServiceDescriptor* service, Printer* out) { 
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				-  string doc = "<fill me in later!>"; 
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				-  map<string, string> dict = ListToDict({ 
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				+  std::string doc = "<fill me in later!>"; 
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				+  map<std::string, std::string> dict = ListToDict({ 
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				         "Service", service->name(), 
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				         "Documentation", doc, 
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				       }); 
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				@@ -169,8 +167,8 @@ bool PrintServer(const ServiceDescriptor* service, Printer* out) { 
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				 bool PrintStub(const ServiceDescriptor* service, 
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				                Printer* out) { 
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				-  string doc = "<fill me in later!>"; 
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				-  map<string, string> dict = ListToDict({ 
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				+  std::string doc = "<fill me in later!>"; 
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				+  map<std::string, std::string> dict = ListToDict({ 
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				         "Service", service->name(), 
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				         "Documentation", doc, 
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				       }); 
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				@@ -181,7 +179,7 @@ bool PrintStub(const ServiceDescriptor* service, 
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				     out->Print("__metaclass__ = abc.ABCMeta\n"); 
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				     for (int i = 0; i < service->method_count(); ++i) { 
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				       const MethodDescriptor* meth = service->method(i); 
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				-      string arg_name = meth->client_streaming() ? 
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				+      std::string arg_name = meth->client_streaming() ? 
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				           "request_iterator" : "request"; 
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				       auto methdict = ListToDict({"Method", meth->name(), "ArgName", arg_name}); 
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				       out->Print("@abc.abstractmethod\n"); 
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				@@ -198,29 +196,29 @@ bool PrintStub(const ServiceDescriptor* service, 
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				 // TODO(protobuf team): Export `ModuleName` from protobuf's 
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				 // `src/google/protobuf/compiler/python/python_generator.cc` file. 
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				-string ModuleName(const string& filename) { 
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				-  string basename = StripProto(filename); 
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				+std::string ModuleName(const std::string& filename) { 
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				+  std::string basename = StripProto(filename); 
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				   basename = StringReplace(basename, "-", "_"); 
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				   basename = StringReplace(basename, "/", "."); 
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				   return basename + "_pb2"; 
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				 } 
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				 bool GetModuleAndMessagePath(const Descriptor* type, 
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				-                             pair<string, string>* out) { 
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				+                             pair<std::string, std::string>* out) { 
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				   const Descriptor* path_elem_type = type; 
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				   vector<const Descriptor*> message_path; 
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				   do { 
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				     message_path.push_back(path_elem_type); 
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				     path_elem_type = path_elem_type->containing_type(); 
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				   } while (path_elem_type != nullptr); 
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				-  string file_name = type->file()->name(); 
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				+  std::string file_name = type->file()->name(); 
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				   static const int proto_suffix_length = strlen(".proto"); 
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				   if (!(file_name.size() > static_cast<size_t>(proto_suffix_length) && 
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				         file_name.find_last_of(".proto") == file_name.size() - 1)) { 
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				     return false; 
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				   } 
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				-  string module = ModuleName(file_name); 
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				-  string message_type; 
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				+  std::string module = ModuleName(file_name); 
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				+  std::string message_type; 
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				   for (auto path_iter = message_path.rbegin(); 
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				        path_iter != message_path.rend(); ++path_iter) { 
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				     message_type += (*path_iter)->name() + "."; 
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				@@ -237,21 +235,21 @@ bool PrintServerFactory(const ServiceDescriptor* service, Printer* out) { 
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				              "Service", service->name()); 
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				   { 
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				     IndentScope raii_create_server_indent(out); 
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				-    map<string, string> method_description_constructors; 
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				-    map<string, pair<string, string>> input_message_modules_and_classes; 
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				-    map<string, pair<string, string>> output_message_modules_and_classes; 
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				+    map<std::string, std::string> method_description_constructors; 
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				+    map<std::string, pair<std::string, std::string>> input_message_modules_and_classes; 
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				+    map<std::string, pair<std::string, std::string>> output_message_modules_and_classes; 
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				     for (int i = 0; i < service->method_count(); ++i) { 
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				       const MethodDescriptor* method = service->method(i); 
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				-      const string method_description_constructor = 
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				-          string(method->client_streaming() ? "stream_" : "unary_") + 
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				-          string(method->server_streaming() ? "stream_" : "unary_") + 
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				+      const std::string method_description_constructor = 
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				+          std::string(method->client_streaming() ? "stream_" : "unary_") + 
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				+          std::string(method->server_streaming() ? "stream_" : "unary_") + 
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				           "service_description"; 
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				-      pair<string, string> input_message_module_and_class; 
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				+      pair<std::string, std::string> input_message_module_and_class; 
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				       if (!GetModuleAndMessagePath(method->input_type(), 
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				                                    &input_message_module_and_class)) { 
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				         return false; 
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				       } 
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				-      pair<string, string> output_message_module_and_class; 
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				+      pair<std::string, std::string> output_message_module_and_class; 
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				       if (!GetModuleAndMessagePath(method->output_type(), 
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				                                    &output_message_module_and_class)) { 
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				         return false; 
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				@@ -272,7 +270,7 @@ bool PrintServerFactory(const ServiceDescriptor* service, Printer* out) { 
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				     for (auto& name_and_description_constructor : 
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				          method_description_constructors) { 
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				       IndentScope raii_descriptions_indent(out); 
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				-      const string method_name = name_and_description_constructor.first; 
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				+      const std::string method_name = name_and_description_constructor.first; 
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				       auto input_message_module_and_class = 
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				           input_message_modules_and_classes.find(method_name); 
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				       auto output_message_module_and_class = 
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				@@ -306,27 +304,27 @@ bool PrintServerFactory(const ServiceDescriptor* service, Printer* out) { 
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				 } 
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				 bool PrintStubFactory(const ServiceDescriptor* service, Printer* out) { 
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				-  map<string, string> dict = ListToDict({ 
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				+  map<std::string, std::string> dict = ListToDict({ 
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				         "Service", service->name(), 
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				       }); 
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				   out->Print(dict, "def early_adopter_create_$Service$_stub(host, port):\n"); 
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				   { 
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				     IndentScope raii_create_server_indent(out); 
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				-    map<string, string> method_description_constructors; 
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				-    map<string, pair<string, string>> input_message_modules_and_classes; 
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				-    map<string, pair<string, string>> output_message_modules_and_classes; 
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				+    map<std::string, std::string> method_description_constructors; 
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				+    map<std::string, pair<std::string, std::string>> input_message_modules_and_classes; 
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				+    map<std::string, pair<std::string, std::string>> output_message_modules_and_classes; 
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				     for (int i = 0; i < service->method_count(); ++i) { 
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				       const MethodDescriptor* method = service->method(i); 
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				-      const string method_description_constructor = 
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				-          string(method->client_streaming() ? "stream_" : "unary_") + 
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				-          string(method->server_streaming() ? "stream_" : "unary_") + 
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				+      const std::string method_description_constructor = 
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				+          std::string(method->client_streaming() ? "stream_" : "unary_") + 
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				+          std::string(method->server_streaming() ? "stream_" : "unary_") + 
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				           "invocation_description"; 
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				-      pair<string, string> input_message_module_and_class; 
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				+      pair<std::string, std::string> input_message_module_and_class; 
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				       if (!GetModuleAndMessagePath(method->input_type(), 
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				                                    &input_message_module_and_class)) { 
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				         return false; 
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				       } 
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				-      pair<string, string> output_message_module_and_class; 
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				+      pair<std::string, std::string> output_message_module_and_class; 
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				       if (!GetModuleAndMessagePath(method->output_type(), 
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				                                    &output_message_module_and_class)) { 
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				         return false; 
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				@@ -347,7 +345,7 @@ bool PrintStubFactory(const ServiceDescriptor* service, Printer* out) { 
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				     for (auto& name_and_description_constructor : 
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				          method_description_constructors) { 
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				       IndentScope raii_descriptions_indent(out); 
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				-      const string method_name = name_and_description_constructor.first; 
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				+      const std::string method_name = name_and_description_constructor.first; 
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				       auto input_message_module_and_class = 
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				           input_message_modules_and_classes.find(method_name); 
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				       auto output_message_module_and_class = 
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				@@ -385,8 +383,8 @@ bool PrintPreamble(const FileDescriptor* file, Printer* out) { 
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				 }  // namespace 
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				-pair<bool, string> GetServices(const FileDescriptor* file) { 
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				-  string output; 
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				+pair<bool, std::string> GetServices(const FileDescriptor* file) { 
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				+  std::string output; 
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				   { 
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				     // Scope the output stream so it closes and finalizes output to the string. 
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				     StringOutputStream output_stream(&output); 
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