added to StrBase a special constructor that doesn't allocation a buffer.

added PtrString classes
added removeNode to HashList and HashTable.
added findNode to HashTable

qse/include/qse/cmn/HashList.hpp

@@ -581,8 +581,24 @@ public:
 		Node* np = this->heterofind_node<MT,MEQUALER> (datum, hc);
 		if (np)
 		{
-			qse_size_t head, tail;
+			this->remove_node (np, hc);
+			return 0;
+		}
 
+		return -1;
+	}
+
+	void removeNode (Node* np)
+	{
+		T& datum = np->value;
+		qse_size_t hc = this->_hasher(datum) % this->node_capacity;
+		this->remove_node (np, hc);
+	}
+
+private:
+	void remove_node (Node* np, qse_size_t hc)
+	{
+		qse_size_t head, tail;
 		head = hc << 1; tail = head + 1;
 
 		if (this->nodes[head] == this->nodes[tail])
@@ -600,12 +616,9 @@ public:
 		}
 
 		this->datum_list->remove (np);
-			return 0;
-		}
-
-		return -1;
 	}
 
+public:
 	void clear (bool clear_mpool = false)
 	{
 		for (qse_size_t i = 0; i < (this->node_capacity << 1); i++) 

qse/include/qse/cmn/HashTable.hpp

@@ -290,6 +290,16 @@ public:
 		return this->pair_list.clear (clear_mpool);
 	}
 
+	void removeNode (PairNode* node)
+	{
+		this->pair_list.removeNode (node);
+	}
+
+	PairNode* findNode (const K& key)
+	{
+		return this->pair_list.findNode (key);
+	}
+
 	Iterator getIterator (qse_size_t index = 0)
 	{
 		return this->pair_list.getIterator (index);

qse/include/qse/cmn/StrBase.hpp

@@ -27,7 +27,6 @@
 #ifndef _QSE_CMN_STRBASE_HPP_
 #define _QSE_CMN_STRBASE_HPP_
 
-
 #include <qse/Hashable.hpp>
 #include <qse/Growable.hpp>
 #include <qse/RefCounted.hpp>
@@ -182,6 +181,42 @@ public:
 		this->ref_item ();
 	}
 
+	StrBase (int capacity): Mmged(QSE_NULL)
+	{
+		if (capacity <= -1)
+		{
+			// this is a special constructor to instanatiate a string with no buffer.
+			// it is intended to be followed by truncate() for actual buffer allocation.
+			// all other functions except the destructor and the truncation() function 
+			// are not aware of this special condition.
+			//
+			// String x(0);
+			// try { x.truncate(10); } catch (...) { return -1; }
+			// x.append ("xxx");
+			// 
+			this->_item = QSE_NULL;
+		}
+		else
+		{
+			this->_item = new(this->getMmgr()) StringItem (this->getMmgr(), this->round_capacity(capacity), (const CHAR_TYPE*)QSE_NULL, 0);
+			this->ref_item ();
+		}
+	}
+	StrBase (Mmgr* mmgr, int capacity): Mmged(mmgr)
+	{
+		if (capacity <= -1) 
+		{
+			// this is a special constructor to instanatiate a string with no buffer.
+			// it is intended to be followed by truncate() for actual buffer allocation.
+			this->_item = QSE_NULL;
+		}
+		else
+		{
+			this->_item = new(this->getMmgr()) StringItem (this->getMmgr(), this->round_capacity(capacity), (const CHAR_TYPE*)QSE_NULL, 0);
+			this->ref_item ();
+		}
+	}
+
 	StrBase (qse_size_t capacity): Mmged(QSE_NULL)
 	{
 		this->_item = new(this->getMmgr()) StringItem (this->getMmgr(), this->round_capacity(capacity), (const CHAR_TYPE*)QSE_NULL, 0);
@@ -240,7 +275,7 @@ public:
 
 	~StrBase () 
 	{
-		this->deref_item ();
+		if (this->_item) this->deref_item ();
 	}
 
 	SelfType& operator= (const SelfType& str)
@@ -360,9 +395,14 @@ public:
 		return this->_item->buffer;
 	}
 
+	const CHAR_TYPE* getData() const
+	{
+		return this->_item->buffer;
+	}
+
 	qse_size_t getHashCode () const
 	{
-		// keep this in sync with getHashCode of BasePtrString<CHAR_TYPE>
+		// keep this in sync with getHashCode() of PtrStrBase<CHAR_TYPE>
 		return Hashable::getHashCode (
 			this->_item->buffer, this->_item->size * QSE_SIZEOF(CHAR_TYPE));
 	}
@@ -439,7 +479,8 @@ public:
 		// you can call truncate twice. for instance,
 		//    str.truncate (1000).
 		//    str.truncate (100).
-
+		if (this->_item)
+		{
 			StringItem* old_item = QSE_NULL;
 
 			if (this->_item->isShared()) 
@@ -467,6 +508,17 @@ public:
 			this->_item->size = new_size;
 			if (old_item) this->deref_item (old_item);
 		}
+		else
+		{
+			// this is the only function that supports some use-cases
+			// of a string object created with no buffer at all.
+			// read comments in the special constructor
+			this->_item = new(this->getMmgr()) StringItem (this->getMmgr(), this->round_capacity(new_size), (const CHAR_TYPE*)QSE_NULL, 0);
+			this->ref_item ();
+			this->_item->buffer[new_size] = NULL_CHAR;
+			this->_item->size = new_size;
+		}
+	}
 
 	//
 	// TODO: comparison, hash, trim, case-converting, etc
@@ -992,7 +1044,6 @@ protected:
 	OPSET _opset;
 	RESIZER _resizer;
 
-
 private:
 	qse_size_t adjust_desired_capacity (qse_size_t new_desired_capacity)
 	{
@@ -1003,6 +1054,76 @@ private:
 
 };
 
+
+template <typename CHAR_TYPE, CHAR_TYPE NULL_CHAR, typename OPSET, typename RESIZER = StrBaseResizer>
+class PtrStrBase
+{
+public:
+	typedef PtrStrBase<CHAR_TYPE,NULL_CHAR,OPSET,RESIZER> ThisType;
+	typedef StrBase<CHAR_TYPE,NULL_CHAR,OPSET,RESIZER> StringType;
+
+	PtrStrBase (): ptr (QSE_NULL), len (0) {}
+
+	PtrStrBase (const CHAR_TYPE* ptr): ptr (ptr)
+	{
+		this->len = this->_opset.getLength (ptr);
+	}
+
+	PtrStrBase (const CHAR_TYPE* ptr, qse_size_t len): ptr (ptr), len (len)
+	{
+		// do nothing
+	}
+
+	qse_size_t getHashCode () const
+	{
+		// keep this in sync with hashCode of StringType(StrBase)
+		return Hashable::getHashCode (this->ptr, this->len * QSE_SIZEOF(CHAR_TYPE));
+	}
+
+	bool operator== (const ThisType& ps) const
+	{
+		if (this->len != ps.len) return false;
+		return this->_opset.compare (this->ptr, ps.ptr, this->len) == 0;
+	}
+
+	bool operator!= (const ThisType& ps) const
+	{
+		return !this->operator== (ps);
+	}
+
+	bool operator== (const StringType& s) const
+	{
+		if (this->len != s.getLength()) return false;
+		return this->_opset.compare (this->ptr, s.getBuffer(), this->len) == 0;
+	}
+
+	bool operator!= (const StringType& s) const
+	{
+		return !this->operator== (s);
+	}
+
+	operator const CHAR_TYPE* () const
+	{
+		return this->ptr;
+	}
+
+	const CHAR_TYPE* getData() const
+	{
+		return this->ptr;
+	}
+
+	qse_size_t getLength() const
+	{
+		return this->len;
+	}
+
+protected:
+	const CHAR_TYPE* ptr;
+	qse_size_t       len;
+
+	OPSET _opset;
+};
+
 /////////////////////////////////
 QSE_END_NAMESPACE(QSE)
 /////////////////////////////////

qse/include/qse/cmn/String.hpp

@@ -181,11 +181,14 @@ struct MbStringOpset
 
 class WcString: public StrBase<qse_wchar_t, QSE_WT('\0'), WcStringOpset> 
 {
-public:
+private:
 	typedef StrBase<qse_wchar_t, QSE_WT('\0'), WcStringOpset> ParentType;
 
+public:
 	WcString (): ParentType() {}
 	WcString (Mmgr* mmgr): ParentType(mmgr) {}
+	WcString (int capacity): ParentType(capacity) {}
+	WcString (Mmgr* mmgr, int capacity): ParentType(mmgr, capacity) {}
 	WcString (qse_size_t capacity): ParentType(capacity) {}
 	WcString (Mmgr* mmgr, qse_size_t capacity): ParentType(mmgr, capacity) {}
 	WcString (const qse_wchar_t* str): ParentType(str) {}
@@ -207,11 +210,14 @@ public:
 
 class MbString: public StrBase<qse_mchar_t, QSE_MT('\0'), MbStringOpset>
 {
-public:
+private:
 	typedef StrBase<qse_mchar_t, QSE_MT('\0'), MbStringOpset> ParentType;
 
+public:
 	MbString (): ParentType() {}
 	MbString (Mmgr* mmgr): ParentType(mmgr) {}
+	MbString (int capacity): ParentType(capacity) {}
+	MbString (Mmgr* mmgr, int capacity): ParentType(mmgr, capacity) {}
 	MbString (qse_size_t capacity): ParentType(capacity) {}
 	MbString (Mmgr* mmgr, qse_size_t capacity): ParentType(mmgr, capacity) {}
 	MbString (const qse_mchar_t* str): ParentType(str) {}
@@ -231,10 +237,38 @@ public:
 	int formatv (const qse_mchar_t* fmt, va_list ap);
 };
 
+
+
+class WcPtrString: public PtrStrBase<qse_wchar_t, QSE_MT('\0'), WcStringOpset>
+{
+private:
+	typedef PtrStrBase<qse_wchar_t, QSE_MT('\0'), WcStringOpset> ParentType;
+
+public:
+	WcPtrString () {}
+	WcPtrString (const qse_wchar_t* ptr): ParentType(ptr) {}
+	WcPtrString (const qse_wchar_t* ptr, qse_size_t len): ParentType(ptr, len) {}
+};
+
+class MbPtrString: public PtrStrBase<qse_mchar_t, QSE_MT('\0'), MbStringOpset>
+{
+private:
+	typedef PtrStrBase<qse_mchar_t, QSE_MT('\0'), MbStringOpset> ParentType;
+
+public:
+	MbPtrString () {}
+	MbPtrString (const qse_mchar_t* ptr): ParentType(ptr) {}
+	MbPtrString (const qse_mchar_t* ptr, qse_size_t len): ParentType(ptr, len) {}
+};
+
+
+
 #if defined(QSE_CHAR_IS_MCHAR)
 	typedef MbString String;
+	typedef MbPtrString PtrString;
 #else
 	typedef WcString String;
+	typedef WcPtrString PtrString;
 #endif
 
 /////////////////////////////////