120 lines
3.8 KiB
C++
120 lines
3.8 KiB
C++
/*
|
|
******************************************************************************
|
|
*
|
|
* Copyright (C) 2002, International Business Machines
|
|
* Corporation and others. All Rights Reserved.
|
|
*
|
|
******************************************************************************
|
|
* file name: uobject.h
|
|
* encoding: US-ASCII
|
|
* tab size: 8 (not used)
|
|
* indentation:4
|
|
*
|
|
* created on: 2002jun26
|
|
* created by: Markus W. Scherer
|
|
*/
|
|
|
|
#ifndef __UOBJECT_H__
|
|
#define __UOBJECT_H__
|
|
|
|
#include "unicode/utypes.h"
|
|
|
|
U_NAMESPACE_BEGIN
|
|
|
|
/**
|
|
* \file
|
|
* \brief C++ API: Common ICU base class UObject.
|
|
*/
|
|
|
|
/* TODO undefine this symbol except for tests! See uobject.cpp */
|
|
// #define U_CPP_MEMORY_TEST
|
|
|
|
/**
|
|
* UObject is the common ICU base class.
|
|
* All other ICU C++ classes are derived from UObject (starting with ICU 2.2).
|
|
*
|
|
* This is primarily to make it possible and simple to override the
|
|
* C++ memory management by adding new/delete operators to this base class.
|
|
* ICU itself will not declare and implement these new/delete operators, but
|
|
* users of ICU can modify the ICU code for the base class.
|
|
*
|
|
* UObject contains pure virtual methods to allow derived classes like Format
|
|
* (which used to be base classes themselves before UObject was introduced)
|
|
* to have pure virtual methods.
|
|
*
|
|
* It is likely that a future ICU release will split UObject to
|
|
* separate out a new "more base" class for only the
|
|
* memory management customization, with UObject subclassing that new
|
|
* class and adding virtual methods for "boilerplate" functions.
|
|
* This will simplify the maintenance of ICU.
|
|
*
|
|
* @draft ICU 2.2
|
|
*/
|
|
class U_COMMON_API UObject {
|
|
public:
|
|
/**
|
|
* Destructor.
|
|
*
|
|
* @draft ICU 2.2
|
|
*/
|
|
virtual inline ~UObject() {}
|
|
|
|
// possible overrides for ICU4C C++ memory management,
|
|
// not provided by ICU itself;
|
|
// simple, non-class types are allocated using the macros in common/cmemory.h
|
|
// (uprv_malloc(), uprv_free(), uprv_realloc());
|
|
// they or something else could be used here to implement C++ new/delete
|
|
// for ICU4C C++ classes
|
|
#ifdef U_CPP_MEMORY_TEST
|
|
void *operator new(size_t size);
|
|
void *operator new[](size_t size);
|
|
void operator delete(void *p);
|
|
void operator delete[](void *p);
|
|
void operator delete(void *p, size_t size);
|
|
void operator delete[](void *p, size_t size);
|
|
#endif
|
|
|
|
/**
|
|
* ICU4C "poor man's RTTI", returns a UClassID for the actual ICU class.
|
|
*
|
|
* @draft ICU 2.2
|
|
*/
|
|
virtual inline UClassID getDynamicClassID() const = 0;
|
|
|
|
protected:
|
|
// the following functions are protected to prevent instantiation and
|
|
// direct use of UObject itself
|
|
|
|
// default constructor
|
|
// commented out because UObject is abstract (see getDynamicClassID)
|
|
// inline UObject() {}
|
|
|
|
// copy constructor
|
|
// commented out because UObject is abstract (see getDynamicClassID)
|
|
// inline UObject(const UObject &other) {}
|
|
|
|
#if U_ICU_VERSION_MAJOR_NUM>2 || (U_ICU_VERSION_MAJOR_NUM==2 && U_ICU_VERSION_MINOR_NUM>2)
|
|
// TODO post ICU 2.2
|
|
// some or all of the following "boilerplate" functions may be made public
|
|
// in a future ICU4C release when all subclasses implement them
|
|
|
|
// assignment operator
|
|
// (not virtual, see "Taligent's Guide to Designing Programs" pp.73..74)
|
|
// commented out because the implementation is the same as a compiler's default
|
|
// UObject &operator=(const UObject &other) { return *this; }
|
|
|
|
// comparison operators
|
|
virtual inline UBool operator==(const UObject &other) const { return this==&other; }
|
|
inline UBool operator!=(const UObject &other) const { return !operator==(other); }
|
|
|
|
// clone() commented out from the base class:
|
|
// some compilers do not support co-variant return types
|
|
// (i.e., subclasses would have to return UObject& as well, instead of SubClass&)
|
|
// virtual UObject *clone() const;
|
|
#endif
|
|
};
|
|
|
|
U_NAMESPACE_END
|
|
|
|
#endif
|