Add a C++ client for presents.

It provides code generators for streamables, services and receivers, but not DObject.  It uses
Apple's CFNetwork for its sockets and builds with XCode, so it's limited to OS X and iOS. It should
be straightforward to replace both to make it cross-platform.



git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@6264 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/cpp/presents/box/BoxedFloat.h

@@ -0,0 +1,24 @@
+#pragma once
+// Generated by running python boxer.py in this directory
+
+#include "presents/Streamable.h"
+#include "presents/streamers/StreamableStreamer.h"
+
+namespace presents { namespace box {
+    class BoxedFloat : public Streamable{
+    public:
+        DECLARE_STREAMABLE();
+
+        float value;
+
+        static Shared<BoxedFloat> createShared (float value)
+        {
+            Shared<BoxedFloat> shared(new BoxedFloat);
+            shared->value = value;
+            return shared;
+        }
+
+        virtual void readObject(ObjectInputStream& in);
+        virtual void writeObject(ObjectOutputStream& out) const;
+    };
+}}