include/wx/any.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/any.h
   3 // Purpose:     wxAny class
   4 // Author:      Jaakko Salli
   5 // Modified by:
   6 // Created:     07/05/2009
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) wxWidgets team
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_ANY_H_
  13 #define _WX_ANY_H_
  14
  15 #include "wx/defs.h"
  16
  17 #if wxUSE_ANY
  18
  19 #include "wx/string.h"
  20 #include "wx/meta/movable.h"
  21 #include "wx/meta/if.h"
  22 #include "wx/typeinfo.h"
  23
  24
  25 // Size of the wxAny value buffer.
  26 enum
  27 {
  28     WX_ANY_VALUE_BUFFER_SIZE = 16
  29 };
  30
  31 union wxAnyValueBuffer
  32 {
  33     union Alignment
  34     {
  35     #if wxHAS_INT64
  36         wxInt64 m_int64;
  37     #endif
  38         long double m_longDouble;
  39         void ( *m_funcPtr )(void);
  40         void ( wxAnyValueBuffer::*m_mFuncPtr )(void);
  41     } m_alignment;
  42
  43     void*   m_ptr;
  44     wxByte  m_buffer[WX_ANY_VALUE_BUFFER_SIZE];
  45 };
  46
  47 //
  48 // wxAnyValueType is base class for value type functionality for C++ data
  49 // types used with wxAny. Usually the default template (wxAnyValueTypeImpl<>)
  50 // will create a satisfactory wxAnyValueType implementation for a data type.
  51 //
  52 class WXDLLIMPEXP_BASE wxAnyValueType
  53 {
  54     WX_DECLARE_ABSTRACT_TYPEINFO(wxAnyValueType)
  55 public:
  56     /**
  57         Default constructor.
  58     */
  59     wxAnyValueType();
  60
  61     /**
  62         Destructor.
  63     */
  64     virtual ~wxAnyValueType()
  65     {
  66     }
  67
  68     /**
  69         This function is used for internal type matching.
  70     */
  71     virtual bool IsSameType(const wxAnyValueType* otherType) const = 0;
  72
  73     /**
  74         This function is called every time the data in wxAny
  75         buffer needs to be freed.
  76     */
  77     virtual void DeleteValue(wxAnyValueBuffer& buf) const = 0;
  78
  79     /**
  80         Implement this for buffer-to-buffer copy.
  81
  82         @param src
  83             This is the source data buffer.
  84
  85         @param dst
  86             This is the destination data buffer that is in either
  87             uninitialized or freed state.
  88     */
  89     virtual void CopyBuffer(const wxAnyValueBuffer& src,
  90                             wxAnyValueBuffer& dst) const = 0;
  91
  92     /**
  93         Convert value into buffer of different type. Return false if
  94         not possible.
  95     */
  96     virtual bool ConvertValue(const wxAnyValueBuffer& src,
  97                               wxAnyValueType* dstType,
  98                               wxAnyValueBuffer& dst) const = 0;
  99
 100     /**
 101         Use this template function for checking if wxAnyValueType represents
 102         a specific C++ data type.
 103
 104         @remarks This template function does not work on some older compilers
 105                 (such as Visual C++ 6.0). For full compiler ccompatibility
 106                 please use wxANY_VALUE_TYPE_CHECK_TYPE(valueTypePtr, T) macro
 107                 instead.
 108
 109         @see wxAny::CheckType()
 110     */
 111     // FIXME-VC6: remove this hack when VC6 is no longer supported
 112     template <typename T>
 113     bool CheckType(T* reserved = NULL);
 114 private:
 115 };
 116
 117 //
 118 // This method of checking the type is compatible with VC6
 119 #define wxANY_VALUE_TYPE_CHECK_TYPE(valueTypePtr, T) \
 120     wxAnyValueTypeImpl<T>::IsSameClass(valueTypePtr)
 121
 122
 123 /**
 124     Helper macro for defining user value types.
 125
 126     Even though C++ RTTI would be fully available to use, we'd have to to
 127     facilitate sub-type system which allows, for instance, wxAny with
 128     signed short '15' to be treated equal to wxAny with signed long long '15'.
 129     Having sm_instance is important here.
 130 */
 131 #define WX_DECLARE_ANY_VALUE_TYPE(CLS) \
 132     friend class wxAny; \
 133     WX_DECLARE_TYPEINFO_INLINE(CLS) \
 134 public: \
 135     static bool IsSameClass(const wxAnyValueType* otherType) \
 136     { \
 137         return wxTypeId(*sm_instance) == wxTypeId(*otherType); \
 138     } \
 139     virtual bool IsSameType(const wxAnyValueType* otherType) const \
 140     { \
 141         return IsSameClass(otherType); \
 142     } \
 143 private: \
 144     static CLS* sm_instance; \
 145 public: \
 146     static wxAnyValueType* GetInstance() \
 147     { \
 148         return sm_instance; \
 149     }
 150
 151
 152 #define WX_IMPLEMENT_ANY_VALUE_TYPE(CLS) \
 153     CLS* CLS::sm_instance = new CLS();
 154
 155
 156 #ifdef __VISUALC6__
 157     // "non dll-interface class 'xxx' used as base interface
 158     #pragma warning (push)
 159     #pragma warning (disable:4275)
 160 #endif
 161
 162 /**
 163     Following are helper classes for the wxAnyValueTypeImplBase.
 164 */
 165 namespace wxPrivate
 166 {
 167
 168 template<typename T>
 169 class wxAnyValueTypeOpsMovable
 170 {
 171 public:
 172     static void DeleteValue(wxAnyValueBuffer& buf)
 173     {
 174         wxUnusedVar(buf);
 175     }
 176
 177     static void SetValue(const T& value,
 178                          wxAnyValueBuffer& buf)
 179     {
 180         memcpy(buf.m_buffer, &value, sizeof(T));
 181     }
 182
 183     static const T& GetValue(const wxAnyValueBuffer& buf)
 184     {
 185         // Breaking this code into two lines should supress
 186         // GCC's 'type-punned pointer will break strict-aliasing rules'
 187         // warning.
 188         const T* value = reinterpret_cast<const T*>(&buf.m_buffer[0]);
 189         return *value;
 190     }
 191 };
 192
 193
 194 template<typename T>
 195 class wxAnyValueTypeOpsGeneric
 196 {
 197 public:
 198     template<typename T2>
 199     class DataHolder
 200     {
 201     public:
 202         DataHolder(const T2& value)
 203         {
 204             m_value = value;
 205         }
 206         virtual ~DataHolder() { }
 207
 208         T2   m_value;
 209     private:
 210         wxDECLARE_NO_COPY_CLASS(DataHolder);
 211     };
 212
 213     static void DeleteValue(wxAnyValueBuffer& buf)
 214     {
 215         DataHolder<T>* holder = static_cast<DataHolder<T>*>(buf.m_ptr);
 216         delete holder;
 217     }
 218
 219     static void SetValue(const T& value,
 220                          wxAnyValueBuffer& buf)
 221     {
 222         DataHolder<T>* holder = new DataHolder<T>(value);
 223         buf.m_ptr = holder;
 224     }
 225
 226     static const T& GetValue(const wxAnyValueBuffer& buf)
 227     {
 228         DataHolder<T>* holder = static_cast<DataHolder<T>*>(buf.m_ptr);
 229         return holder->m_value;
 230     }
 231 };
 232
 233 } // namespace wxPrivate
 234
 235
 236 /**
 237     Intermediate template for the generic value type implementation.
 238     We can derive from this same value type for multiple actual types
 239     (for instance, we can have wxAnyValueTypeImplInt for all signed
 240     integer types), and also easily implement specialized templates
 241     with specific dynamic type conversion.
 242 */
 243 template<typename T>
 244 class wxAnyValueTypeImplBase : public wxAnyValueType
 245 {
 246     typedef typename wxIf< wxIsMovable<T>::value &&
 247                                 sizeof(T) <= WX_ANY_VALUE_BUFFER_SIZE,
 248                            wxPrivate::wxAnyValueTypeOpsMovable<T>,
 249                            wxPrivate::wxAnyValueTypeOpsGeneric<T> >::value
 250             Ops;
 251
 252 public:
 253     wxAnyValueTypeImplBase() : wxAnyValueType() { }
 254     virtual ~wxAnyValueTypeImplBase() { }
 255
 256     virtual void DeleteValue(wxAnyValueBuffer& buf) const
 257     {
 258         Ops::DeleteValue(buf);
 259     }
 260
 261     virtual void CopyBuffer(const wxAnyValueBuffer& src,
 262                             wxAnyValueBuffer& dst) const
 263     {
 264         Ops::SetValue(Ops::GetValue(src), dst);
 265     }
 266
 267     /**
 268         It is important to reimplement this in any specialized template
 269         classes that inherit from wxAnyValueTypeImplBase.
 270     */
 271     static void SetValue(const T& value,
 272                          wxAnyValueBuffer& buf)
 273     {
 274         Ops::SetValue(value, buf);
 275     }
 276
 277     /**
 278         It is important to reimplement this in any specialized template
 279         classes that inherit from wxAnyValueTypeImplBase.
 280     */
 281     static const T& GetValue(const wxAnyValueBuffer& buf)
 282     {
 283         return Ops::GetValue(buf);
 284     }
 285 };
 286
 287
 288 /*
 289     Generic value type template. Note that bulk of the implementation
 290     resides in wxAnyValueTypeImplBase.
 291 */
 292 template<typename T>
 293 class wxAnyValueTypeImpl : public wxAnyValueTypeImplBase<T>
 294 {
 295     WX_DECLARE_ANY_VALUE_TYPE(wxAnyValueTypeImpl<T>)
 296 public:
 297     wxAnyValueTypeImpl() : wxAnyValueTypeImplBase<T>() { }
 298     virtual ~wxAnyValueTypeImpl() { }
 299
 300     virtual bool ConvertValue(const wxAnyValueBuffer& src,
 301                               wxAnyValueType* dstType,
 302                               wxAnyValueBuffer& dst) const
 303     {
 304         wxUnusedVar(src);
 305         wxUnusedVar(dstType);
 306         wxUnusedVar(dst);
 307         return false;
 308     }
 309 };
 310
 311 template<typename T>
 312 wxAnyValueTypeImpl<T>* wxAnyValueTypeImpl<T>::sm_instance =
 313     new wxAnyValueTypeImpl<T>();
 314
 315
 316 //
 317 // Helper macro for using same base value type implementation for multiple
 318 // actual C++ data types.
 319 //
 320 #define WX_ANY_DEFINE_SUB_TYPE(T, CLSTYPE) \
 321 template<> \
 322 class wxAnyValueTypeImpl<T> : public wxAnyValueTypeImpl##CLSTYPE \
 323 { \
 324     typedef wxAnyBase##CLSTYPE##Type UseDataType; \
 325 public: \
 326     wxAnyValueTypeImpl() : wxAnyValueTypeImpl##CLSTYPE() { } \
 327     virtual ~wxAnyValueTypeImpl() { } \
 328     static void SetValue(const T& value, wxAnyValueBuffer& buf) \
 329     { \
 330         void* voidPtr = reinterpret_cast<void*>(&buf.m_buffer[0]); \
 331         UseDataType* dptr = reinterpret_cast<UseDataType*>(voidPtr); \
 332         *dptr = static_cast<UseDataType>(value); \
 333     } \
 334     static T GetValue(const wxAnyValueBuffer& buf) \
 335     { \
 336         const void* voidPtr = \
 337             reinterpret_cast<const void*>(&buf.m_buffer[0]); \
 338         const UseDataType* sptr = \
 339             reinterpret_cast<const UseDataType*>(voidPtr); \
 340         return static_cast<T>(*sptr); \
 341     } \
 342 };
 343
 344
 345 //
 346 //  Integer value types
 347 //
 348
 349 #ifdef wxLongLong_t
 350     typedef wxLongLong_t wxAnyBaseIntType;
 351     typedef wxULongLong_t wxAnyBaseUintType;
 352 #else
 353     typedef long wxAnyBaseIntType;
 354     typedef unsigned long wxAnyBaseUintType;
 355 #endif
 356
 357
 358 class WXDLLIMPEXP_BASE wxAnyValueTypeImplInt :
 359     public wxAnyValueTypeImplBase<wxAnyBaseIntType>
 360 {
 361     WX_DECLARE_ANY_VALUE_TYPE(wxAnyValueTypeImplInt)
 362 public:
 363     wxAnyValueTypeImplInt() :
 364         wxAnyValueTypeImplBase<wxAnyBaseIntType>() { }
 365     virtual ~wxAnyValueTypeImplInt() { }
 366
 367     virtual bool ConvertValue(const wxAnyValueBuffer& src,
 368                               wxAnyValueType* dstType,
 369                               wxAnyValueBuffer& dst) const;
 370 };
 371
 372
 373 class WXDLLIMPEXP_BASE wxAnyValueTypeImplUint :
 374     public wxAnyValueTypeImplBase<wxAnyBaseUintType>
 375 {
 376     WX_DECLARE_ANY_VALUE_TYPE(wxAnyValueTypeImplUint)
 377 public:
 378     wxAnyValueTypeImplUint() :
 379         wxAnyValueTypeImplBase<wxAnyBaseUintType>() { }
 380     virtual ~wxAnyValueTypeImplUint() { }
 381
 382     virtual bool ConvertValue(const wxAnyValueBuffer& src,
 383                               wxAnyValueType* dstType,
 384                               wxAnyValueBuffer& dst) const;
 385 };
 386
 387
 388 WX_ANY_DEFINE_SUB_TYPE(signed long, Int)
 389 WX_ANY_DEFINE_SUB_TYPE(signed int, Int)
 390 WX_ANY_DEFINE_SUB_TYPE(signed short, Int)
 391 WX_ANY_DEFINE_SUB_TYPE(signed char, Int)
 392 #ifdef wxLongLong_t
 393 WX_ANY_DEFINE_SUB_TYPE(wxLongLong_t, Int)
 394 #endif
 395
 396 WX_ANY_DEFINE_SUB_TYPE(unsigned long, Uint)
 397 WX_ANY_DEFINE_SUB_TYPE(unsigned int, Uint)
 398 WX_ANY_DEFINE_SUB_TYPE(unsigned short, Uint)
 399 WX_ANY_DEFINE_SUB_TYPE(unsigned char, Uint)
 400 #ifdef wxLongLong_t
 401 WX_ANY_DEFINE_SUB_TYPE(wxULongLong_t, Uint)
 402 #endif
 403
 404
 405 //
 406 // String value type
 407 //
 408 class WXDLLIMPEXP_BASE wxAnyValueTypeImplString :
 409     public wxAnyValueTypeImplBase<wxString>
 410 {
 411     WX_DECLARE_ANY_VALUE_TYPE(wxAnyValueTypeImplString)
 412 public:
 413     wxAnyValueTypeImplString() :
 414         wxAnyValueTypeImplBase<wxString>() { }
 415     virtual ~wxAnyValueTypeImplString() { }
 416
 417     /**
 418         Convert value into buffer of different type. Return false if
 419         not possible.
 420     */
 421     virtual bool ConvertValue(const wxAnyValueBuffer& src,
 422                               wxAnyValueType* dstType,
 423                               wxAnyValueBuffer& dst) const;
 424
 425 };
 426
 427 template<>
 428 class wxAnyValueTypeImpl<wxString> : public wxAnyValueTypeImplString
 429 {
 430 public:
 431     wxAnyValueTypeImpl() : wxAnyValueTypeImplString() { }
 432     virtual ~wxAnyValueTypeImpl() { }
 433 };
 434
 435
 436 //
 437 // Bool value type
 438 //
 439 template<>
 440 class WXDLLIMPEXP_BASE wxAnyValueTypeImpl<bool> :
 441     public wxAnyValueTypeImplBase<bool>
 442 {
 443     WX_DECLARE_ANY_VALUE_TYPE(wxAnyValueTypeImpl<bool>)
 444 public:
 445     wxAnyValueTypeImpl() :
 446         wxAnyValueTypeImplBase<bool>() { }
 447     virtual ~wxAnyValueTypeImpl() { }
 448
 449     virtual bool ConvertValue(const wxAnyValueBuffer& src,
 450                               wxAnyValueType* dstType,
 451                               wxAnyValueBuffer& dst) const;
 452 };
 453
 454 //
 455 // Floating point value type
 456 //
 457 class WXDLLIMPEXP_BASE wxAnyValueTypeImplDouble :
 458     public wxAnyValueTypeImplBase<double>
 459 {
 460     WX_DECLARE_ANY_VALUE_TYPE(wxAnyValueTypeImplDouble)
 461 public:
 462     wxAnyValueTypeImplDouble() :
 463         wxAnyValueTypeImplBase<double>() { }
 464     virtual ~wxAnyValueTypeImplDouble() { }
 465
 466     virtual bool ConvertValue(const wxAnyValueBuffer& src,
 467                               wxAnyValueType* dstType,
 468                               wxAnyValueBuffer& dst) const;
 469 };
 470
 471 // WX_ANY_DEFINE_SUB_TYPE requires this
 472 typedef double wxAnyBaseDoubleType;
 473
 474 WX_ANY_DEFINE_SUB_TYPE(float, Double)
 475 WX_ANY_DEFINE_SUB_TYPE(double, Double)
 476
 477
 478 //
 479 // Defines a dummy wxAnyValueTypeImpl<> with given export
 480 // declaration. This is needed if a class is used with
 481 // wxAny in both user shared library and application.
 482 //
 483 #define wxDECLARE_ANY_TYPE(CLS, DECL) \
 484 template<> \
 485 class DECL wxAnyValueTypeImpl<CLS> : \
 486     public wxAnyValueTypeImplBase<CLS> \
 487 { \
 488     WX_DECLARE_ANY_VALUE_TYPE(wxAnyValueTypeImpl<CLS>) \
 489 public: \
 490     wxAnyValueTypeImpl() : \
 491         wxAnyValueTypeImplBase<CLS>() { } \
 492     virtual ~wxAnyValueTypeImpl() { } \
 493  \
 494     virtual bool ConvertValue(const wxAnyValueBuffer& src, \
 495                               wxAnyValueType* dstType, \
 496                               wxAnyValueBuffer& dst) const \
 497     { \
 498         wxUnusedVar(src); \
 499         wxUnusedVar(dstType); \
 500         wxUnusedVar(dst); \
 501         return false; \
 502     } \
 503 };
 504
 505
 506 // Make sure some of wx's own types get the right wxAnyValueType export
 507 // (this is needed only for types that are referred to from wxBase.
 508 // currently we may not use any of these types from there, but let's
 509 // use the macro on at least one to make sure it compiles since we can't
 510 // really test it properly in unittests since a separate DLL would
 511 // be needed).
 512 #if wxUSE_DATETIME
 513     #include "wx/datetime.h"
 514     wxDECLARE_ANY_TYPE(wxDateTime, WXDLLIMPEXP_BASE)
 515 #endif
 516
 517 //#include "wx/object.h"
 518 //wxDECLARE_ANY_TYPE(wxObject*, WXDLLIMPEXP_BASE)
 519
 520 //#include "wx/arrstr.h"
 521 //wxDECLARE_ANY_TYPE(wxArrayString, WXDLLIMPEXP_BASE)
 522
 523
 524
 525 #ifdef __VISUALC6__
 526     // Re-enable useless VC6 warnings
 527     #pragma warning (pop)
 528 #endif
 529
 530
 531 /*
 532     Let's define a discrete Null value so we don't have to really
 533     ever check if wxAny.m_type pointer is NULL or not. This is an
 534     optimization, mostly. Implementation of this value type is
 535     "hidden" in the source file.
 536 */
 537 extern WXDLLIMPEXP_DATA_BASE(wxAnyValueType*) wxAnyNullValueType;
 538
 539
 540 //
 541 // We need to implement custom signed/unsigned int equals operators
 542 // for signed/unsigned (eg. wxAny(128UL) == 128L) comparisons to work.
 543 #define WXANY_IMPLEMENT_INT_EQ_OP(TS, TUS) \
 544 bool operator==(TS value) const \
 545 { \
 546     if ( wxAnyValueTypeImpl<TS>::IsSameClass(m_type) ) \
 547         return (value == static_cast<TS> \
 548                 (wxAnyValueTypeImpl<TS>::GetValue(m_buffer))); \
 549     if ( wxAnyValueTypeImpl<TUS>::IsSameClass(m_type) ) \
 550         return (value == static_cast<TS> \
 551                 (wxAnyValueTypeImpl<TUS>::GetValue(m_buffer))); \
 552     return false; \
 553 } \
 554 bool operator==(TUS value) const \
 555 { \
 556     if ( wxAnyValueTypeImpl<TUS>::IsSameClass(m_type) ) \
 557         return (value == static_cast<TUS> \
 558                 (wxAnyValueTypeImpl<TUS>::GetValue(m_buffer))); \
 559     if ( wxAnyValueTypeImpl<TS>::IsSameClass(m_type) ) \
 560         return (value == static_cast<TUS> \
 561                 (wxAnyValueTypeImpl<TS>::GetValue(m_buffer))); \
 562     return false; \
 563 }
 564
 565
 566 //
 567 // The wxAny class represents a container for any type. A variant's value
 568 // can be changed at run time, possibly to a different type of value.
 569 //
 570 // As standard, wxAny can store value of almost any type, in a fairly
 571 // optimal manner even.
 572 //
 573 class wxAny
 574 {
 575 public:
 576     /**
 577         Default constructor.
 578     */
 579     wxAny()
 580     {
 581         m_type = wxAnyNullValueType;
 582     }
 583
 584     /**
 585         Destructor.
 586     */
 587     ~wxAny()
 588     {
 589         m_type->DeleteValue(m_buffer);
 590     }
 591
 592     //@{
 593     /**
 594         Various constructors.
 595     */
 596     wxAny(const char* value)
 597     {
 598         m_type = wxAnyNullValueType;
 599         Assign(wxString(value));
 600     }
 601     wxAny(const wchar_t* value)
 602     {
 603         m_type = wxAnyNullValueType;
 604         Assign(wxString(value));
 605     }
 606
 607     wxAny(const wxAny& any)
 608     {
 609         m_type = wxAnyNullValueType;
 610         AssignAny(any);
 611     }
 612
 613     template<typename T>
 614     wxAny(const T& value)
 615     {
 616         m_type = wxAnyValueTypeImpl<T>::sm_instance;
 617         wxAnyValueTypeImpl<T>::SetValue(value, m_buffer);
 618     }
 619     //@}
 620
 621     /**
 622         Use this template function for checking if this wxAny holds
 623         a specific C++ data type.
 624
 625         @remarks This template function does not work on some older compilers
 626                 (such as Visual C++ 6.0). For full compiler ccompatibility
 627                 please use wxANY_CHECK_TYPE(any, T) macro instead.
 628
 629         @see wxAnyValueType::CheckType()
 630     */
 631     // FIXME-VC6: remove this hack when VC6 is no longer supported
 632     template <typename T>
 633     bool CheckType(T* = NULL)
 634     {
 635         return m_type->CheckType<T>();
 636     }
 637
 638     /**
 639         Returns the value type as wxAnyValueType instance.
 640
 641         @remarks You cannot reliably test whether two wxAnys are of
 642                  same value type by simply comparing return values
 643                  of wxAny::GetType(). Instead use
 644                  wxAnyValueType::CheckType<T>() template function.
 645     */
 646     const wxAnyValueType* GetType() const
 647     {
 648         return m_type;
 649     }
 650
 651     /**
 652         Tests if wxAny is null (that is, whether there is data).
 653     */
 654     bool IsNull() const
 655     {
 656         return (m_type == wxAnyNullValueType);
 657     }
 658
 659     /**
 660         Makes wxAny null (that is, clears it).
 661     */
 662     void MakeNull()
 663     {
 664         m_type->DeleteValue(m_buffer);
 665         m_type = wxAnyNullValueType;
 666     }
 667
 668     //@{
 669     /**
 670         Assignment operators.
 671     */
 672     wxAny& operator=(const wxAny &any)
 673     {
 674         if (this != &any)
 675             AssignAny(any);
 676         return *this;
 677     }
 678
 679     template<typename T>
 680     wxAny& operator=(const T &value)
 681     {
 682         m_type->DeleteValue(m_buffer);
 683         m_type = wxAnyValueTypeImpl<T>::sm_instance;
 684         wxAnyValueTypeImpl<T>::SetValue(value, m_buffer);
 685         return *this;
 686     }
 687
 688     wxAny& operator=(const char* value)
 689         { Assign(wxString(value)); return *this; }
 690     wxAny& operator=(const wchar_t* value)
 691         { Assign(wxString(value)); return *this; }
 692     //@}
 693
 694     //@{
 695     /**
 696         Equality operators.
 697     */
 698     bool operator==(const wxString& value) const
 699     {
 700         if ( !wxAnyValueTypeImpl<wxString>::IsSameClass(m_type) )
 701             return false;
 702
 703         return value ==
 704             static_cast<wxString>
 705                 (wxAnyValueTypeImpl<wxString>::GetValue(m_buffer));
 706     }
 707
 708     bool operator==(const char* value) const
 709         { return (*this) == wxString(value); }
 710     bool operator==(const wchar_t* value) const
 711         { return (*this) == wxString(value); }
 712
 713     //
 714     // We need to implement custom signed/unsigned int equals operators
 715     // for signed/unsigned (eg. wxAny(128UL) == 128L) comparisons to work.
 716     WXANY_IMPLEMENT_INT_EQ_OP(signed char, unsigned char)
 717     WXANY_IMPLEMENT_INT_EQ_OP(signed short, unsigned short)
 718     WXANY_IMPLEMENT_INT_EQ_OP(signed int, unsigned int)
 719     WXANY_IMPLEMENT_INT_EQ_OP(signed long, unsigned long)
 720 #ifdef wxLongLong_t
 721     WXANY_IMPLEMENT_INT_EQ_OP(wxLongLong_t, wxULongLong_t)
 722 #endif
 723
 724     bool operator==(float value) const
 725     {
 726         if ( !wxAnyValueTypeImpl<float>::IsSameClass(m_type) )
 727             return false;
 728
 729         return value ==
 730             static_cast<float>
 731                 (wxAnyValueTypeImpl<float>::GetValue(m_buffer));
 732     }
 733
 734     bool operator==(double value) const
 735     {
 736         if ( !wxAnyValueTypeImpl<double>::IsSameClass(m_type) )
 737             return false;
 738
 739         return value ==
 740             static_cast<double>
 741                 (wxAnyValueTypeImpl<double>::GetValue(m_buffer));
 742     }
 743
 744     bool operator==(bool value) const
 745     {
 746         if ( !wxAnyValueTypeImpl<bool>::IsSameClass(m_type) )
 747             return false;
 748
 749         return value == (wxAnyValueTypeImpl<bool>::GetValue(m_buffer));
 750     }
 751
 752     //@}
 753
 754     //@{
 755     /**
 756         Inequality operators (implement as template).
 757     */
 758     template<typename T>
 759     bool operator!=(const T& value) const
 760         { return !((*this) == value); }
 761     //@}
 762
 763     /**
 764         This template function converts wxAny into given type. No dynamic
 765         conversion is performed, so if the type is incorrect an assertion
 766         failure will occur in debug builds, and a bogus value is returned
 767         in release ones.
 768
 769         @remarks This template function does not work on some older compilers
 770                 (such as Visual C++ 6.0). For full compiler compatibility
 771                 please use wxANY_AS(any, T) macro instead.
 772     */
 773     // FIXME-VC6: remove this hack when VC6 is no longer supported
 774     template<typename T>
 775     T As(T* = NULL) const
 776     {
 777         if ( !wxAnyValueTypeImpl<T>::IsSameClass(m_type) )
 778         {
 779             wxFAIL_MSG("Incorrect or non-convertible data type");
 780         }
 781
 782         return static_cast<T>(wxAnyValueTypeImpl<T>::GetValue(m_buffer));
 783     }
 784
 785     /**
 786         Template function that etrieves and converts the value of this
 787         variant to the type that T* value is.
 788
 789         @return Returns @true if conversion was succesfull.
 790     */
 791     template<typename T>
 792     bool GetAs(T* value) const
 793     {
 794         if ( !wxAnyValueTypeImpl<T>::IsSameClass(m_type) )
 795         {
 796             wxAnyValueType* otherType =
 797                 wxAnyValueTypeImpl<T>::sm_instance;
 798             wxAnyValueBuffer temp_buf;
 799
 800             if ( !m_type->ConvertValue(m_buffer, otherType, temp_buf) )
 801                 return false;
 802
 803             *value =
 804                 static_cast<T>(wxAnyValueTypeImpl<T>::GetValue(temp_buf));
 805             otherType->DeleteValue(temp_buf);
 806
 807             return true;
 808         }
 809         *value = static_cast<T>(wxAnyValueTypeImpl<T>::GetValue(m_buffer));
 810         return true;
 811     }
 812
 813 private:
 814     // Assignment functions
 815     void AssignAny(const wxAny& any)
 816     {
 817         // Must delete value - CopyBuffer() never does that
 818         m_type->DeleteValue(m_buffer);
 819
 820         wxAnyValueType* newType = any.m_type;
 821
 822         if ( !newType->IsSameType(m_type) )
 823             m_type = newType;
 824
 825         newType->CopyBuffer(any.m_buffer, m_buffer);
 826     }
 827
 828     template<typename T>
 829     void Assign(const T &value)
 830     {
 831         m_type->DeleteValue(m_buffer);
 832         m_type = wxAnyValueTypeImpl<T>::sm_instance;
 833         wxAnyValueTypeImpl<T>::SetValue(value, m_buffer);
 834     }
 835
 836     // Data
 837     wxAnyValueBuffer    m_buffer;
 838     wxAnyValueType*     m_type;
 839 };
 840
 841
 842 //
 843 // This method of checking the type is compatible with VC6
 844 #define wxANY_CHECK_TYPE(any, T) \
 845     wxANY_VALUE_TYPE_CHECK_TYPE(any.GetType(), T)
 846
 847
 848 //
 849 // This method of getting the value is compatible with VC6
 850 #define wxANY_AS(any, T) \
 851     any.As(static_cast<T*>(NULL))
 852
 853
 854 template<typename T>
 855 inline bool wxAnyValueType::CheckType(T* reserved)
 856 {
 857     wxUnusedVar(reserved);
 858     return wxAnyValueTypeImpl<T>::IsSameClass(this);
 859 }
 860
 861
 862
 863 #endif // wxUSE_ANY
 864
 865 #endif // _WX_ANY_H_