add PISet::const_iterator, now can iterate ranged-for PISet by T, not by PIPair<T, bool>

libs/main/containers/pimap.h

@@ -610,7 +610,7 @@ public:
 		return ret;
 	}
 
-private:
+protected:
 	struct MapIndex {
 		MapIndex(const Key & k = Key(), size_t i = 0): key(k), index(i) {}
 		MapIndex(Key && k, size_t i = 0): key(std::move(k)), index(i) {}
@@ -627,6 +627,10 @@ private:
 	template<typename P, typename Key1, typename T1>
 	friend PIBinaryStream<P> & operator<<(PIBinaryStream<P> & s, const PIDeque<typename PIMap<Key1, T1>::MapIndex> & v);
 
+	PIVector<T> pim_content;
+	PIDeque<MapIndex> pim_index;
+
+private:
 	inline ssize_t _binarySearch(ssize_t first, ssize_t last, const Key & key, bool & found) const {
 		ssize_t mid = 0;
 		while (first <= last) {
@@ -678,10 +682,6 @@ private:
 	inline T & _value(ssize_t index) { return pim_content[pim_index[index].index]; }
 
 	inline const T & _value(ssize_t index) const { return pim_content[pim_index[index].index]; }
-
-
-	PIVector<T> pim_content;
-	PIDeque<MapIndex> pim_index;
 };