Added emitting std::set (and refactored the stl emitters a bit)

include/yaml-cpp/stlemitter.h

@@ -8,32 +8,37 @@
 
 #include <vector>
 #include <list>
+#include <set>
 #include <map>
 
 namespace YAML
 {
-	template <typename T>
-	inline Emitter& operator << (Emitter& emitter, const std::vector <T>& v) {
-		typedef typename std::vector <T> vec;
+	template<typename Seq>
+	inline Emitter& EmitSeq(Emitter& emitter, const Seq& seq) {
 		emitter << BeginSeq;
-		for(typename vec::const_iterator it=v.begin();it!=v.end();++it)
+		for(typename Seq::const_iterator it=seq.begin();it!=seq.end();++it)
 			emitter << *it;
 		emitter << EndSeq;
 		return emitter;
+	}
+	
+	template<typename T>
+	inline Emitter& operator << (Emitter& emitter, const std::vector<T>& v) {
+		return EmitSeq(emitter, v);
 	}	
 
-	template <typename T>
-	inline Emitter& operator << (Emitter& emitter, const std::list <T>& v) {
-		typedef typename std::list <T> list;
-		emitter << BeginSeq;
-		for(typename list::const_iterator it=v.begin();it!=v.end();++it)
-			emitter << *it;
-		emitter << EndSeq;
-		return emitter;
+	template<typename T>
+	inline Emitter& operator << (Emitter& emitter, const std::list<T>& v) {
+		return EmitSeq(emitter, v);
+	}
+
+	template<typename T>
+	inline Emitter& operator << (Emitter& emitter, const std::set<T>& v) {
+		return EmitSeq(emitter, v);
 	}
 	
 	template <typename K, typename V>
-	inline Emitter& operator << (Emitter& emitter, const std::map <K, V>& m) {
+	inline Emitter& operator << (Emitter& emitter, const std::map<K, V>& m) {
 		typedef typename std::map <K, V> map;
 		emitter << BeginMap;
 		for(typename map::const_iterator it=m.begin();it!=m.end();++it)