+ CharType * const p = m_data->Get();
+
+ wxCharTypeBuffer *self = const_cast<wxCharTypeBuffer*>(this);
+ self->m_data->Set(NULL);
+ self->DecRef();
+
+ return p;
+ }
+
+ void reset()
+ {
+ DecRef();
+ }
+
+ wxCharTypeBuffer(const wxCharTypeBuffer& src)
+ {
+ m_data = src.m_data;
+ IncRef();
+ }
+
+ wxCharTypeBuffer& operator=(const CharType *str)
+ {
+ DecRef();
+
+ if ( str )
+ m_data = new Data(wxStrdup(str));
+ return *this;
+ }
+
+ wxCharTypeBuffer& operator=(const wxCharTypeBuffer& src)
+ {
+ if ( &src == this )
+ return *this;
+
+ DecRef();
+ m_data = src.m_data;
+ IncRef();
+
+ return *this;
+ }
+
+ bool extend(size_t len)
+ {
+ wxASSERT_MSG( m_data->m_owned, _T("cannot extend non-owned buffer") );
+ wxASSERT_MSG( m_data->m_ref == 1, _T("can't extend shared buffer") );
+
+ CharType *str =
+ (CharType *)realloc(data(), (len + 1) * sizeof(CharType));
+ if ( !str )
+ return false;
+
+ if ( m_data == GetNullData() )
+ {
+ m_data = new Data(str);
+ }
+ else
+ {
+ m_data->Set(str);
+ m_data->m_owned = true;
+ }
+
+ return true;
+ }
+
+ CharType *data() { return m_data->Get(); }
+ const CharType *data() const { return m_data->Get(); }
+ operator const CharType *() const { return data(); }
+ CharType operator[](size_t n) const { return data()[n]; }
+
+private:
+ // reference-counted data
+ struct Data : public wxPrivate::UntypedBufferData
+ {
+ Data(CharType *str, Kind kind = Owned)
+ : wxPrivate::UntypedBufferData(str, kind)
+ {
+ }
+
+ CharType *Get() const { return static_cast<CharType *>(m_str); }
+ void Set(CharType *str) { m_str = str; }
+ };
+
+ // placeholder for NULL string, to simplify this code
+ static Data *GetNullData()
+ {
+ return static_cast<Data *>(wxPrivate::untypedNullDataPtr);
+ }
+
+ void IncRef()
+ {
+ if ( m_data == GetNullData() ) // exception, not ref-counted
+ return;
+ m_data->m_ref++;
+ }
+
+ void DecRef()
+ {
+ if ( m_data == GetNullData() ) // exception, not ref-counted
+ return;
+ if ( --m_data->m_ref == 0 )
+ delete m_data;
+ m_data = GetNullData();
+ }