X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/77ffb5937e89927b621128789401db8921fe580f..7258d99573521263607fcc95632cd54a174bea91:/include/wx/variant.h diff --git a/include/wx/variant.h b/include/wx/variant.h index fc517d7175..89cb6c437d 100644 --- a/include/wx/variant.h +++ b/include/wx/variant.h @@ -1,35 +1,31 @@ ///////////////////////////////////////////////////////////////////////////// -// 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" /* @@ -37,6 +33,19 @@ * 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. @@ -46,165 +55,106 @@ * 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; @@ -212,32 +162,138 @@ public: 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 +#ifdef HAVE_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 ; +#endif - 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 + wxVariant& operator=(const wxCharTypeBuffer& 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(); @@ -248,44 +304,138 @@ public: // 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(data) extern wxVariant WXDLLIMPEXP_BASE wxNullVariant; -#endif - // _WX_VARIANT_H_ +#endif // wxUSE_VARIANT + +#endif // _WX_VARIANT_H_