RPC protocol implementation WIP.

c++/src/capnp/object.c++

@@ -36,6 +36,9 @@ kj::Own<const ClientHook> ObjectPointer::Reader::getPipelinedCap(
 
   for (auto& op: ops) {
     switch (op.type) {
+      case PipelineOp::Type::NOOP:
+        break;
+
       case PipelineOp::Type::GET_POINTER_FIELD:
         pointer = pointer.getStruct(nullptr).getPointerField(op.pointerIndex * POINTERS);
         break;

c++/src/capnp/object.h

@@ -47,6 +47,8 @@ struct PipelineOp {
   // Corresponds to rpc.capnp's PromisedAnswer.Op.
 
   enum Type {
+    NOOP,  // for convenience
+
     GET_POINTER_FIELD
 
     // There may be other types in the future...

c++/src/capnp/pointer-helpers.h

@@ -55,6 +55,13 @@ struct PointerHelpers<T, Kind::STRUCT> {
   static inline Orphan<T> disown(PointerBuilder builder) {
     return Orphan<T>(builder.disown());
   }
+
+  static inline _::StructReader getInternalReader(const typename T::Reader& reader) {
+    // TODO(cleanup):  This is used by RpcSystem::Connect, but perhaps it should be used more
+    //   broadly so that we can reduce the number of friends declared by every Reader type.
+
+    return reader._reader;
+  }
 };
 
 template <typename T>