/////////////////////////////////////////////////////////////////////////////
-// Name: variant.h
+// Name: wx/variant.h
// Purpose: wxVariant class, container for any type
// Author: Julian Smart
// Modified by:
// Created: 10/09/98
// RCS-ID: $Id$
-// Copyright: (c)
-// Licence: wxWidgets licence
+// Copyright: (c) Julian Smart
+// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifndef _WX_VARIANT_H_
#define _WX_VARIANT_H_
-#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
-#pragma interface "variant.h"
-#endif
-
#include "wx/defs.h"
+
+#if wxUSE_VARIANT
+
#include "wx/object.h"
#include "wx/string.h"
#include "wx/arrstr.h"
#include "wx/list.h"
+#include "wx/cpp.h"
#if wxUSE_DATETIME
#include "wx/datetime.h"
#endif // wxUSE_DATETIME
-#if wxUSE_ODBC
- #include "wx/db.h" // will #include sqltypes.h
-#endif //ODBC
-
#include "wx/iosfwrap.h"
/*
* to allow it to store any type of data.
* Derive from this to provide custom data handling.
*
+ * NB: To prevent addition of extra vtbl pointer to wxVariantData,
+ * we don't multiple-inherit from wxObjectRefData. Instead,
+ * we simply replicate the wxObject ref-counting scheme.
+ *
+ * NB: When you construct a wxVariantData, it will have refcount
+ * of one. Refcount will not be further increased when
+ * it is passed to wxVariant. This simulates old common
+ * scenario where wxVariant took ownership of wxVariantData
+ * passed to it.
+ * If you create wxVariantData for other reasons than passing
+ * it to wxVariant, technically you are not required to call
+ * DecRef() before deleting it.
+ *
* TODO: in order to replace wxPropertyValue, we would need
* to consider adding constructors that take pointers to C++ variables,
* or removing that functionality from the wxProperty library.
* overloading wxVariant with unnecessary functionality.
*/
-class WXDLLIMPEXP_BASE wxVariantData: public wxObject
+class WXDLLIMPEXP_BASE wxVariantData
{
-DECLARE_ABSTRACT_CLASS(wxVariantData)
+ friend class wxVariant;
public:
+ wxVariantData() : m_count(1) { }
-// Construction & destruction
- wxVariantData() {};
-
-// Override these to provide common functionality
- // Copy to data
- virtual void Copy(wxVariantData& data) = 0;
+ // Override these to provide common functionality
virtual bool Eq(wxVariantData& data) const = 0;
+
#if wxUSE_STD_IOSTREAM
- virtual bool Write(wxSTD ostream& str) const = 0;
+ virtual bool Write(wxSTD ostream& WXUNUSED(str)) const { return false; }
#endif
- virtual bool Write(wxString& str) const = 0;
+ virtual bool Write(wxString& WXUNUSED(str)) const { return false; }
#if wxUSE_STD_IOSTREAM
- virtual bool Read(wxSTD istream& str) = 0;
+ virtual bool Read(wxSTD istream& WXUNUSED(str)) { return false; }
#endif
- virtual bool Read(wxString& str) = 0;
+ virtual bool Read(wxString& WXUNUSED(str)) { return false; }
// What type is it? Return a string name.
virtual wxString GetType() const = 0;
// If it based on wxObject return the ClassInfo.
virtual wxClassInfo* GetValueClassInfo() { return NULL; }
+
+ // Implement this to make wxVariant::AllocExcusive work. Returns
+ // a copy of the data.
+ virtual wxVariantData* Clone() const { return NULL; }
+
+ void IncRef() { m_count++; }
+ void DecRef()
+ {
+ if ( --m_count == 0 )
+ delete this;
+ }
+
+ int GetRefCount() const { return m_count; }
+
+protected:
+ // Protected dtor should make some incompatible code
+ // break more louder. That is, they should do data->DecRef()
+ // instead of delete data.
+ virtual ~wxVariantData() { }
+
+private:
+ int m_count;
};
/*
* wxVariant can store any kind of data, but has some basic types
* built in.
- * NOTE: this eventually should have a reference-counting implementation.
- * PLEASE, if you change it to ref-counting, make sure it doesn't involve bloating
- * this class too much.
*/
+class WXDLLIMPEXP_FWD_BASE wxVariant;
+
+WX_DECLARE_LIST_WITH_DECL(wxVariant, wxVariantList, class WXDLLIMPEXP_BASE);
+
class WXDLLIMPEXP_BASE wxVariant: public wxObject
{
-DECLARE_DYNAMIC_CLASS(wxVariant)
public:
-
-// Construction & destruction
wxVariant();
- wxVariant(double val, const wxString& name = wxEmptyString);
- wxVariant(long val, const wxString& name = wxEmptyString);
-#ifdef HAVE_BOOL
- wxVariant(bool val, const wxString& name = wxEmptyString);
-#endif
- wxVariant(char val, const wxString& name = wxEmptyString);
- wxVariant(const wxString& val, const wxString& name = wxEmptyString);
- wxVariant(const wxChar* val, const wxString& name = wxEmptyString); // Necessary or VC++ assumes bool!
- wxVariant(const wxStringList& val, const wxString& name = wxEmptyString);
- wxVariant(const wxList& val, const wxString& name = wxEmptyString); // List of variants
- wxVariant(void* ptr, const wxString& name = wxEmptyString); // void* (general purpose)
- wxVariant(wxObject* ptr, const wxString& name = wxEmptyString); //wxObject
- wxVariant(wxVariantData* data, const wxString& name = wxEmptyString); // User-defined data
-//TODO: Need to document
-#if wxUSE_DATETIME
- wxVariant(const wxDateTime& val, const wxString& name = wxEmptyString); // Date
-#endif // wxUSE_DATETIME
- wxVariant(const wxArrayString& val, const wxString& name = wxEmptyString); // String array
-#if wxUSE_ODBC
- wxVariant(const DATE_STRUCT* valptr, const wxString& name = wxEmptyString); // DateTime
- wxVariant(const TIME_STRUCT* valptr, const wxString& name = wxEmptyString); // DateTime
- wxVariant(const TIMESTAMP_STRUCT* valptr, const wxString& name = wxEmptyString); // DateTime
-#endif
-//TODO: End of Need to document
-
+
wxVariant(const wxVariant& variant);
- ~wxVariant();
+ wxVariant(wxVariantData* data, const wxString& name = wxEmptyString);
+ virtual ~wxVariant();
-// Generic operators
- // Assignment
+ // generic assignment
void operator= (const wxVariant& variant);
-//TODO: Need to document
-#if wxUSE_DATETIME
- bool operator== (const wxDateTime& value) const;
- bool operator!= (const wxDateTime& value) const;
- void operator= (const wxDateTime& value) ;
-#endif // wxUSE_DATETIME
-
- bool operator== (const wxArrayString& value) const;
- bool operator!= (const wxArrayString& value) const;
- void operator= (const wxArrayString& value) ;
-#if wxUSE_ODBC
- void operator= (const DATE_STRUCT* value) ;
- void operator= (const TIME_STRUCT* value) ;
- void operator= (const TIMESTAMP_STRUCT* value) ;
-#endif
-//TODO: End of Need to document
-
// Assignment using data, e.g.
// myVariant = new wxStringVariantData("hello");
void operator= (wxVariantData* variantData);
+
bool operator== (const wxVariant& variant) const;
bool operator!= (const wxVariant& variant) const;
-// Specific operators
- bool operator== (double value) const;
- bool operator!= (double value) const;
- void operator= (double value) ;
- bool operator== (long value) const;
- bool operator!= (long value) const;
- void operator= (long value) ;
- bool operator== (char value) const;
- bool operator!= (char value) const;
- void operator= (char value) ;
-#ifdef HAVE_BOOL
- bool operator== (bool value) const;
- bool operator!= (bool value) const;
- void operator= (bool value) ;
-#endif
- bool operator== (const wxString& value) const;
- bool operator!= (const wxString& value) const;
- void operator= (const wxString& value) ;
- void operator= (const wxChar* value) ; // Necessary or VC++ assumes bool!
- bool operator== (const wxStringList& value) const;
- bool operator!= (const wxStringList& value) const;
- void operator= (const wxStringList& value) ;
- bool operator== (const wxList& value) const;
- bool operator!= (const wxList& value) const;
- void operator= (const wxList& value) ;
- bool operator== (void* value) const;
- bool operator!= (void* value) const;
- void operator= (void* value) ;
-
- // Treat a list variant as an array
- wxVariant operator[] (size_t idx) const;
- wxVariant& operator[] (size_t idx) ;
-
- // Implicit conversion to a wxString
- inline operator wxString () const { return MakeString(); }
- wxString MakeString() const;
-
- // Other implicit conversions
- inline operator double () const { return GetDouble(); }
- inline operator char () const { return GetChar(); }
- inline operator long () const { return GetLong(); }
- inline operator bool () const { return GetBool(); }
- inline operator void* () const { return GetVoidPtr(); }
- // No implicit conversion to wxObject, as that would really
- // confuse people between conversion to our contained data
- // and downcasting to see our base type.
-//TODO: Need to document
-#if wxUSE_DATETIME
- inline operator wxDateTime () const { return GetDateTime(); }
-#endif // wxUSE_DATETIME
-//TODO: End of Need to document
-
-// Accessors
// Sets/gets name
inline void SetName(const wxString& name) { m_name = name; }
inline const wxString& GetName() const { return m_name; }
// Tests whether there is data
- inline bool IsNull() const { return (m_data == (wxVariantData*) NULL); }
+ bool IsNull() const;
+ // For compatibility with wxWidgets <= 2.6, this doesn't increase
+ // reference count.
wxVariantData* GetData() const { return m_data; }
void SetData(wxVariantData* data) ;
+ // make a 'clone' of the object
+ void Ref(const wxVariant& clone);
+
+ // destroy a reference
+ void UnRef();
+
+ // ensure that the data is exclusive to this variant, and not shared
+ bool Unshare();
+
+ // Make NULL (i.e. delete the data)
+ void MakeNull();
+
+ // Delete data and name
+ void Clear();
+
// Returns a string representing the type of the variant,
// e.g. "string", "bool", "stringlist", "list", "double", "long"
wxString GetType() const;
bool IsType(const wxString& type) const;
bool IsValueKindOf(const wxClassInfo* type) const;
- // Return the number of elements in a list
- int GetCount() const;
-
-// Value accessors
- double GetReal() const ;
- inline double GetDouble() const { return GetReal(); };
- long GetInteger() const ;
- inline long GetLong() const { return GetInteger(); };
- char GetChar() const ;
+ // write contents to a string (e.g. for debugging)
+ wxString MakeString() const;
+
+ // double
+ wxVariant(double val, const wxString& name = wxEmptyString);
+ bool operator== (double value) const;
+ bool operator!= (double value) const;
+ void operator= (double value) ;
+ inline operator double () const { return GetDouble(); }
+ inline double GetReal() const { return GetDouble(); }
+ double GetDouble() const;
+
+ // long
+ wxVariant(long val, const wxString& name = wxEmptyString);
+ wxVariant(int val, const wxString& name = wxEmptyString);
+ wxVariant(short val, const wxString& name = wxEmptyString);
+ bool operator== (long value) const;
+ bool operator!= (long value) const;
+ void operator= (long value) ;
+ inline operator long () const { return GetLong(); }
+ inline long GetInteger() const { return GetLong(); }
+ long GetLong() const;
+
+ // bool
+ wxVariant(bool val, const wxString& name = wxEmptyString);
+ bool operator== (bool value) const;
+ bool operator!= (bool value) const;
+ void operator= (bool value) ;
+ inline operator bool () const { return GetBool(); }
bool GetBool() const ;
- wxString GetString() const ;
- wxList& GetList() const ;
- wxStringList& GetStringList() const ;
- void* GetVoidPtr() const ;
- wxObject* GetWxObjectPtr() ;
-//TODO: Need to document
+ // wxDateTime
#if wxUSE_DATETIME
- wxDateTime GetDateTime() const ;
-#endif // wxUSE_DATETIME
+ wxVariant(const wxDateTime& val, const wxString& name = wxEmptyString);
+ bool operator== (const wxDateTime& value) const;
+ bool operator!= (const wxDateTime& value) const;
+ void operator= (const wxDateTime& value) ;
+ inline operator wxDateTime () const { return GetDateTime(); }
+ wxDateTime GetDateTime() const;
+#endif
+
+ // wxString
+ wxVariant(const wxString& val, const wxString& name = wxEmptyString);
+ // these overloads are necessary to prevent the compiler from using bool
+ // version instead of wxString one:
+ wxVariant(const char* val, const wxString& name = wxEmptyString);
+ wxVariant(const wchar_t* val, const wxString& name = wxEmptyString);
+ wxVariant(const wxCStrData& val, const wxString& name = wxEmptyString);
+ wxVariant(const wxCharBuffer& val, const wxString& name = wxEmptyString);
+ wxVariant(const wxWCharBuffer& val, const wxString& name = wxEmptyString);
+
+ bool operator== (const wxString& value) const;
+ bool operator!= (const wxString& value) const;
+ wxVariant& operator=(const wxString& value);
+ // these overloads are necessary to prevent the compiler from using bool
+ // version instead of wxString one:
+ wxVariant& operator=(const char* value)
+ { return *this = wxString(value); }
+ wxVariant& operator=(const wchar_t* value)
+ { return *this = wxString(value); }
+ wxVariant& operator=(const wxCStrData& value)
+ { return *this = value.AsString(); }
+ template<typename T>
+ wxVariant& operator=(const wxCharTypeBuffer<T>& value)
+ { return *this = value.data(); }
+
+ inline operator wxString () const { return MakeString(); }
+ wxString GetString() const;
+
+ // wxUniChar
+ wxVariant(const wxUniChar& val, const wxString& name = wxEmptyString);
+ wxVariant(const wxUniCharRef& val, const wxString& name = wxEmptyString);
+ wxVariant(char val, const wxString& name = wxEmptyString);
+ wxVariant(wchar_t val, const wxString& name = wxEmptyString);
+ bool operator==(const wxUniChar& value) const;
+ bool operator==(const wxUniCharRef& value) const { return *this == wxUniChar(value); }
+ bool operator==(char value) const { return *this == wxUniChar(value); }
+ bool operator==(wchar_t value) const { return *this == wxUniChar(value); }
+ bool operator!=(const wxUniChar& value) const { return !(*this == value); }
+ bool operator!=(const wxUniCharRef& value) const { return !(*this == value); }
+ bool operator!=(char value) const { return !(*this == value); }
+ bool operator!=(wchar_t value) const { return !(*this == value); }
+ wxVariant& operator=(const wxUniChar& value);
+ wxVariant& operator=(const wxUniCharRef& value) { return *this = wxUniChar(value); }
+ wxVariant& operator=(char value) { return *this = wxUniChar(value); }
+ wxVariant& operator=(wchar_t value) { return *this = wxUniChar(value); }
+ operator wxUniChar() const { return GetChar(); }
+ operator char() const { return GetChar(); }
+ operator wchar_t() const { return GetChar(); }
+ wxUniChar GetChar() const;
+
+ // wxArrayString
+ wxVariant(const wxArrayString& val, const wxString& name = wxEmptyString);
+ bool operator== (const wxArrayString& value) const;
+ bool operator!= (const wxArrayString& value) const;
+ void operator= (const wxArrayString& value);
+ operator wxArrayString () const { return GetArrayString(); }
wxArrayString GetArrayString() const;
-//TODO: End of Need to document
-// Operations
- // Make NULL (i.e. delete the data)
- void MakeNull();
+ // void*
+ wxVariant(void* ptr, const wxString& name = wxEmptyString);
+ bool operator== (void* value) const;
+ bool operator!= (void* value) const;
+ void operator= (void* value);
+ operator void* () const { return GetVoidPtr(); }
+ void* GetVoidPtr() const;
+
+ // wxObject*
+ wxVariant(wxObject* ptr, const wxString& name = wxEmptyString);
+ bool operator== (wxObject* value) const;
+ bool operator!= (wxObject* value) const;
+ void operator= (wxObject* value);
+ wxObject* GetWxObjectPtr() const;
+
+
+ // ------------------------------
+ // list operations
+ // ------------------------------
+
+ wxVariant(const wxVariantList& val, const wxString& name = wxEmptyString); // List of variants
+ bool operator== (const wxVariantList& value) const;
+ bool operator!= (const wxVariantList& value) const;
+ void operator= (const wxVariantList& value) ;
+ // Treat a list variant as an array
+ wxVariant operator[] (size_t idx) const;
+ wxVariant& operator[] (size_t idx) ;
+ wxVariantList& GetList() const ;
+
+ // Return the number of elements in a list
+ size_t GetCount() const;
// Make empty list
void NullList();
// Insert at front of list
void Insert(const wxVariant& value);
- // Returns TRUE if the variant is a member of the list
+ // Returns true if the variant is a member of the list
bool Member(const wxVariant& value) const;
// Deletes the nth element of the list
- bool Delete(int item);
+ bool Delete(size_t item);
// Clear list
void ClearList();
-// Implementation
public:
-// Type conversion
+ // Type conversion
bool Convert(long* value) const;
bool Convert(bool* value) const;
bool Convert(double* value) const;
bool Convert(wxString* value) const;
+ bool Convert(wxUniChar* value) const;
bool Convert(char* value) const;
-//TODO: Need to document
+ bool Convert(wchar_t* value) const;
#if wxUSE_DATETIME
bool Convert(wxDateTime* value) const;
#endif // wxUSE_DATETIME
-//TODO: End of Need to document
// Attributes
protected:
wxVariantData* m_data;
wxString m_name;
+
+private:
+ DECLARE_DYNAMIC_CLASS(wxVariant)
};
-//Since we want type safety wxVariant we need to fetch and dynamic_cast
-//in a seemingly safe way so the compiler can check, so we define
-//a dynamic_cast /wxDynamicCast analogue.
+#define DECLARE_VARIANT_OBJECT(classname) \
+ DECLARE_VARIANT_OBJECT_EXPORTED(classname, wxEMPTY_PARAMETER_VALUE)
+
+#define DECLARE_VARIANT_OBJECT_EXPORTED(classname,expdecl) \
+expdecl classname& operator << ( classname &object, const wxVariant &variant ); \
+expdecl wxVariant& operator << ( wxVariant &variant, const classname &object );
+
+#define IMPLEMENT_VARIANT_OBJECT(classname) \
+ IMPLEMENT_VARIANT_OBJECT_EXPORTED(classname, wxEMPTY_PARAMETER_VALUE)
+
+#define IMPLEMENT_VARIANT_OBJECT_EXPORTED_NO_EQ(classname,expdecl) \
+class classname##VariantData: public wxVariantData \
+{ \
+public:\
+ classname##VariantData() {} \
+ classname##VariantData( const classname &value ) { m_value = value; } \
+\
+ classname &GetValue() { return m_value; } \
+\
+ virtual bool Eq(wxVariantData& data) const; \
+\
+ virtual wxString GetType() const; \
+ virtual wxClassInfo* GetValueClassInfo(); \
+\
+ virtual wxVariantData* Clone() const { return new classname##VariantData(m_value); } \
+\
+protected:\
+ classname m_value; \
+};\
+\
+wxString classname##VariantData::GetType() const\
+{\
+ return m_value.GetClassInfo()->GetClassName();\
+}\
+\
+wxClassInfo* classname##VariantData::GetValueClassInfo()\
+{\
+ return m_value.GetClassInfo();\
+}\
+\
+expdecl classname& operator << ( classname &value, const wxVariant &variant )\
+{\
+ wxASSERT( variant.GetType() == #classname );\
+ \
+ classname##VariantData *data = (classname##VariantData*) variant.GetData();\
+ value = data->GetValue();\
+ return value;\
+}\
+\
+expdecl wxVariant& operator << ( wxVariant &variant, const classname &value )\
+{\
+ classname##VariantData *data = new classname##VariantData( value );\
+ variant.SetData( data );\
+ return variant;\
+}
+
+// implements a wxVariantData-derived class using for the Eq() method the
+// operator== which must have been provided by "classname"
+#define IMPLEMENT_VARIANT_OBJECT_EXPORTED(classname,expdecl) \
+IMPLEMENT_VARIANT_OBJECT_EXPORTED_NO_EQ(classname,wxEMPTY_PARAMETER_VALUE expdecl) \
+\
+bool classname##VariantData::Eq(wxVariantData& data) const \
+{\
+ wxASSERT( GetType() == data.GetType() );\
+\
+ classname##VariantData & otherData = (classname##VariantData &) data;\
+\
+ return otherData.m_value == m_value;\
+}\
+
+
+// implements a wxVariantData-derived class using for the Eq() method a shallow
+// comparison (through wxObject::IsSameAs function)
+#define IMPLEMENT_VARIANT_OBJECT_SHALLOWCMP(classname) \
+ IMPLEMENT_VARIANT_OBJECT_EXPORTED_SHALLOWCMP(classname, wxEMPTY_PARAMETER_VALUE)
+#define IMPLEMENT_VARIANT_OBJECT_EXPORTED_SHALLOWCMP(classname,expdecl) \
+IMPLEMENT_VARIANT_OBJECT_EXPORTED_NO_EQ(classname,wxEMPTY_PARAMETER_VALUE expdecl) \
+\
+bool classname##VariantData::Eq(wxVariantData& data) const \
+{\
+ wxASSERT( GetType() == data.GetType() );\
+\
+ classname##VariantData & otherData = (classname##VariantData &) data;\
+\
+ return (otherData.m_value.IsSameAs(m_value));\
+}\
+
+
+// Since we want type safety wxVariant we need to fetch and dynamic_cast
+// in a seemingly safe way so the compiler can check, so we define
+// a dynamic_cast /wxDynamicCast analogue.
#define wxGetVariantCast(var,classname) \
- ((classname*)(var.IsValueKindOf(&classname::ms_classInfo) ?\
- var.GetWxObjectPtr() : NULL));
+ ((classname*)(var.IsValueKindOf(&classname::ms_classInfo) ?\
+ var.GetWxObjectPtr() : NULL));
+
+// Replacement for using wxDynamicCast on a wxVariantData object
+#define wxDynamicCastVariantData(data, classname) dynamic_cast<classname*>(data)
extern wxVariant WXDLLIMPEXP_BASE wxNullVariant;
-#endif
- // _WX_VARIANT_H_
+#endif // wxUSE_VARIANT
+
+#endif // _WX_VARIANT_H_
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