+
+void operator<<(LexicalConverter &conv, TrackChain::Direction dir)
+{
+ switch(dir)
+ {
+ case TrackChain::UNSPECIFIED: conv.result("UNSPECIFIED"); return;
+ case TrackChain::UP: conv.result("UP"); return;
+ case TrackChain::DOWN: conv.result("DOWN"); return;
+ default: throw lexical_error(format("conversion of Direction(%d) to string", static_cast<int>(dir)));
+ }
+}
+
+void operator>>(const LexicalConverter &conv, TrackChain::Direction &dir)
+{
+ const string &str = conv.get();
+ if(str=="UNSPECIFIED")
+ dir = TrackChain::UNSPECIFIED;
+ else if(str=="UP")
+ dir = TrackChain::UP;
+ else if(str=="DOWN")
+ dir = TrackChain::DOWN;
+ else
+ throw lexical_error(format("conversion of '%s' to Direction", str));
+}
+