--- /dev/null
+
+#ifndef UPB_STDCPP_H_
+#define UPB_STDCPP_H_
+
+#include "upb/sink.h"
+
+#include "upb/port_def.inc"
+
+namespace upb {
+
+template <class T>
+class FillStringHandler {
+ public:
+ static void SetHandler(upb_byteshandler* handler) {
+ upb_byteshandler_setstartstr(handler, &FillStringHandler::StartString,
+ NULL);
+ upb_byteshandler_setstring(handler, &FillStringHandler::StringBuf, NULL);
+ }
+
+ private:
+ // TODO(haberman): add UpbBind/UpbMakeHandler support to BytesHandler so these
+ // can be prettier callbacks.
+ static void* StartString(void *c, const void *hd, size_t size) {
+ UPB_UNUSED(hd);
+ UPB_UNUSED(size);
+
+ T* str = static_cast<T*>(c);
+ str->clear();
+ return c;
+ }
+
+ static size_t StringBuf(void* c, const void* hd, const char* buf, size_t n,
+ const upb_bufhandle* h) {
+ UPB_UNUSED(hd);
+ UPB_UNUSED(h);
+
+ T* str = static_cast<T*>(c);
+ try {
+ str->append(buf, n);
+ return n;
+ } catch (const std::exception&) {
+ return 0;
+ }
+ }
+};
+
+class StringSink {
+ public:
+ template <class T>
+ explicit StringSink(T* target) {
+ // TODO(haberman): we need to avoid rebuilding a new handler every time,
+ // but with class globals disallowed for google3 C++ this is tricky.
+ upb_byteshandler_init(&handler_);
+ FillStringHandler<T>::SetHandler(&handler_);
+ input_.Reset(&handler_, target);
+ }
+
+ BytesSink input() { return input_; }
+
+ private:
+ upb_byteshandler handler_;
+ BytesSink input_;
+};
+
+} // namespace upb
+
+#include "upb/port_undef.inc"
+
+#endif // UPB_STDCPP_H_