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uobject.h

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00001 /*
00002 ******************************************************************************
00003 *
00004 *   Copyright (C) 2002, International Business Machines
00005 *   Corporation and others.  All Rights Reserved.
00006 *
00007 ******************************************************************************
00008 *   file name:  uobject.h
00009 *   encoding:   US-ASCII
00010 *   tab size:   8 (not used)
00011 *   indentation:4
00012 *
00013 *   created on: 2002jun26
00014 *   created by: Markus W. Scherer
00015 */
00016 
00017 #ifndef __UOBJECT_H__
00018 #define __UOBJECT_H__
00019 
00020 #include "unicode/utypes.h"
00021 
00022 U_NAMESPACE_BEGIN
00023 
00037 #ifndef U_OVERRIDE_CXX_ALLOCATION
00038 #define U_OVERRIDE_CXX_ALLOCATION 1
00039 #endif
00040 
00063 class U_COMMON_API UObject {
00064 public:
00070     virtual inline ~UObject() {}
00071 
00072 
00073 #if U_OVERRIDE_CXX_ALLOCATION
00074 
00082     void *operator new(size_t size);
00083     void *operator new[](size_t size);
00084 
00093     void operator delete(void *p);
00094     void operator delete[](void *p);
00095 #endif
00096 
00102     virtual inline UClassID getDynamicClassID() const = 0;
00103 
00104 protected:
00105     // the following functions are protected to prevent instantiation and
00106     // direct use of UObject itself
00107 
00108     // default constructor
00109     // commented out because UObject is abstract (see getDynamicClassID)
00110     // inline UObject() {}
00111 
00112     // copy constructor
00113     // commented out because UObject is abstract (see getDynamicClassID)
00114     // inline UObject(const UObject &other) {}
00115 
00116 #if U_ICU_VERSION_MAJOR_NUM>2 || (U_ICU_VERSION_MAJOR_NUM==2 && U_ICU_VERSION_MINOR_NUM>2)
00117     // TODO post ICU 2.2
00118     // some or all of the following "boilerplate" functions may be made public
00119     // in a future ICU4C release when all subclasses implement them
00120 
00121     // assignment operator
00122     // (not virtual, see "Taligent's Guide to Designing Programs" pp.73..74)
00123     // commented out because the implementation is the same as a compiler's default
00124     // UObject &operator=(const UObject &other) { return *this; }
00125 
00126     // comparison operators
00127     virtual inline UBool operator==(const UObject &other) const { return this==&other; }
00128     inline UBool operator!=(const UObject &other) const { return !operator==(other); }
00129 
00130     // clone() commented out from the base class:
00131     // some compilers do not support co-variant return types
00132     // (i.e., subclasses would have to return UObject * as well, instead of SubClass *)
00133     // virtual UObject *clone() const;
00134 #endif
00135 };
00136 
00137 U_NAMESPACE_END
00138 
00139 #endif

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