Lots of work on debugging diff xmit

luprex/core/cpp/util.hpp

@@ -31,6 +31,7 @@ enum MessageType {
 
 using StringVec = std::vector<std::string>;
 using StringPair = std::pair<std::string, std::string>;
+using StringSet = std::set<std::string>;
 using LuaSourceVec = std::vector<StringPair>;
 using LuaSourcePtr = std::unique_ptr<LuaSourceVec>;
 using HashValue = std::pair<uint64_t, uint64_t>;
@@ -127,6 +128,12 @@ class hex32 {};
 class hex16 {};
 class hex8 {};
 
+class NullStreamBuffer : public std::streambuf
+{
+public:
+  int overflow(int c) { return c; }
+};
+
 } // namespace util
 
 std::ostream &operator<<(std::ostream &oss, const util::hex64 &v);