-#define DEFINE_BUFFER(classname, chartype, strdupfunc) \
-class WXDLLIMPEXP_BASE classname \
-{ \
-public: \
- classname(const chartype *str) \
- : m_str(str ? strdupfunc(str) : NULL) \
- { \
- } \
- \
- classname(size_t len) \
- : m_str((chartype *)malloc((len + 1)*sizeof(chartype))) \
- { \
- m_str[len] = (chartype)0; \
- } \
- \
- /* no need to check for NULL, free() does it */ \
- ~classname() { free(m_str); } \
- \
- /* \
- WARNING: \
- \
- the copy ctor and assignment operators change the passed in object \
- even although it is declared as "const", so: \
- \
- a) it shouldn't be really const \
- b) you shouldn't use it afterwards (or know that it was reset) \
- \
- This is very ugly but is unfortunately needed to make the normal use\
- of classname buffer objects possible and is very similar to what \
- std::auto_ptr<> does (as if it were an excuse...) \
- */ \
- \
- /* \
- because of the remark above, release() is declared const even if it \
- isn't really const \
- */ \
- chartype *release() const \
- { \
- chartype *p = m_str; \
- ((classname *)this)->m_str = NULL; \
- return p; \
- } \
- \
- classname(const classname& src) \
- : m_str(src.release()) \
- { \
- } \
- \
- classname& operator=(const chartype *str) \
- { \
- free(m_str); \
- m_str = str ? strdupfunc(str) : NULL; \
- return *this; \
- } \
- \
- classname& operator=(const classname& src) \
- { \
- free(m_str); \
- m_str = src.release(); \
- \
- return *this; \
- } \
- \
- chartype *data() { return m_str; } \
- const chartype *data() const { return m_str; } \
- operator const chartype *() const { return m_str; } \
- chartype operator[](size_t n) const { return m_str[n]; } \
- \
-private: \
- chartype *m_str; \
-}
-
-DEFINE_BUFFER(wxCharBuffer, char, wxStrdupA);
+// helpers used by wxCharTypeBuffer
+namespace wxPrivate
+{
+
+struct UntypedBufferData
+{
+ enum Kind
+ {
+ Owned,
+ NonOwned
+ };
+
+ UntypedBufferData(void *str, Kind kind = Owned)
+ : m_str(str), m_ref(1), m_owned(kind == Owned) {}
+
+ ~UntypedBufferData()
+ {
+ if ( m_owned )
+ free(m_str);
+ }
+
+ void *m_str;
+
+ // "short" to have sizeof(Data)=8 on 32bit archs
+ unsigned short m_ref;
+
+ bool m_owned;
+};
+
+// this has to be defined inside the DLL (and not e.g. as a static variable
+// inside an inline function) as otherwise MSVC gives link errors when the
+// functions are effectively inlined (i.e. in non-debug build)
+//
+// NB: this is defined in string.cpp and not the (non-existent) buffer.cpp
+extern WXDLLIMPEXP_DATA_BASE(UntypedBufferData * const) untypedNullDataPtr;
+
+} // namespace wxPrivate
+
+template <typename T>
+class wxCharTypeBuffer
+{
+public:
+ typedef T CharType;
+
+ wxCharTypeBuffer(const CharType *str = NULL)
+ {
+ if ( str )
+ m_data = new Data(wxStrdup(str));
+ else
+ m_data = GetNullData();
+ }
+
+ wxCharTypeBuffer(size_t len)
+ {
+ m_data = new Data((CharType *)malloc((len + 1)*sizeof(CharType)));
+ m_data->Get()[len] = (CharType)0;
+ }
+
+ static const wxCharTypeBuffer CreateNonOwned(const CharType *str)
+ {
+ wxCharTypeBuffer buf;
+ if ( str )
+ buf.m_data = new Data(const_cast<CharType*>(str), Data::NonOwned);
+ return buf;
+ }
+
+ ~wxCharTypeBuffer()
+ {
+ DecRef();
+ }
+
+ // NB: this method is only const for backward compatibility. It used to
+ // be needed for auto_ptr-like semantics of the copy ctor, but now
+ // that ref-counting is used, it's not really needed.
+ CharType *release() const
+ {
+ if ( m_data == GetNullData() )
+ return NULL;
+
+ wxASSERT_MSG( m_data->m_owned, _T("can't release non-owned buffer") );
+ wxASSERT_MSG( m_data->m_ref == 1, _T("can't release shared buffer") );
+
+ 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();
+ }
+
+private:
+ Data *m_data;
+};
+
+WXDLLIMPEXP_TEMPLATE_INSTANCE_BASE( wxCharTypeBuffer<char> )
+
+class wxCharBuffer : public wxCharTypeBuffer<char>
+{
+public:
+ typedef wxCharTypeBuffer<char> wxCharTypeBufferBase;
+
+ wxCharBuffer(const wxCharTypeBufferBase& buf)
+ : wxCharTypeBufferBase(buf) {}
+
+ wxCharBuffer(const CharType *str = NULL) : wxCharTypeBufferBase(str) {}
+ wxCharBuffer(size_t len) : wxCharTypeBufferBase(len) {}
+
+ wxCharBuffer(const wxCStrData& cstr);
+};
projects / wxWidgets.git / blobdiff