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-// © 2016 and later: Unicode, Inc. and others.
-// License & terms of use: http://www.unicode.org/copyright.html
-/*
-******************************************************************************
-*
-* Copyright (C) 2002-2012, International Business Machines
-* Corporation and others. All Rights Reserved.
-*
-******************************************************************************
-* file name: uobject.h
-* encoding: UTF-8
-* 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"
-
-/**
- * \file
- * \brief C++ API: Common ICU base class UObject.
- */
-
-/**
- * \def U_NO_THROW
- * Define this to define the throw() specification so
- * certain functions do not throw any exceptions
- *
- * UMemory operator new methods should have the throw() specification
- * appended to them, so that the compiler adds the additional NULL check
- * before calling constructors. Without, if <code>operator new</code> returns NULL the
- * constructor is still called, and if the constructor references member
- * data, (which it typically does), the result is a segmentation violation.
- *
- * @stable ICU 4.2
- */
-#ifndef U_NO_THROW
-#define U_NO_THROW throw()
-#endif
-
-/*===========================================================================*/
-/* UClassID-based RTTI */
-/*===========================================================================*/
-
-/**
- * UClassID is used to identify classes without using the compiler's RTTI.
- * This was used before C++ compilers consistently supported RTTI.
- * ICU 4.6 requires compiler RTTI to be turned on.
- *
- * Each class hierarchy which needs
- * to implement polymorphic clone() or operator==() defines two methods,
- * described in detail below. UClassID values can be compared using
- * operator==(). Nothing else should be done with them.
- *
- * \par
- * In class hierarchies that implement "poor man's RTTI",
- * each concrete subclass implements getDynamicClassID() in the same way:
- *
- * \code
- * class Derived {
- * public:
- * virtual UClassID getDynamicClassID() const
- * { return Derived::getStaticClassID(); }
- * }
- * \endcode
- *
- * Each concrete class implements getStaticClassID() as well, which allows
- * clients to test for a specific type.
- *
- * \code
- * class Derived {
- * public:
- * static UClassID U_EXPORT2 getStaticClassID();
- * private:
- * static char fgClassID;
- * }
- *
- * // In Derived.cpp:
- * UClassID Derived::getStaticClassID()
- * { return (UClassID)&Derived::fgClassID; }
- * char Derived::fgClassID = 0; // Value is irrelevant
- * \endcode
- * @stable ICU 2.0
- */
-typedef void* UClassID;
-
-U_NAMESPACE_BEGIN
-
-/**
- * UMemory is the common ICU base class.
- * All other ICU C++ classes are derived from UMemory (starting with ICU 2.4).
- *
- * This is primarily to make it possible and simple to override the
- * C++ memory management by adding new/delete operators to this base class.
- *
- * To override ALL ICU memory management, including that from plain C code,
- * replace the allocation functions declared in cmemory.h
- *
- * UMemory does not contain any virtual functions.
- * Common "boilerplate" functions are defined in UObject.
- *
- * @stable ICU 2.4
- */
-class U_COMMON_API UMemory {
-public:
-
-/* test versions for debugging shaper heap memory problems */
-#ifdef SHAPER_MEMORY_DEBUG
- static void * NewArray(int size, int count);
- static void * GrowArray(void * array, int newSize );
- static void FreeArray(void * array );
-#endif
-
-#if U_OVERRIDE_CXX_ALLOCATION
- /**
- * Override for ICU4C C++ memory management.
- * 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
- * @stable ICU 2.4
- */
- static void * U_EXPORT2 operator new(size_t size) U_NO_THROW;
-
- /**
- * Override for ICU4C C++ memory management.
- * See new().
- * @stable ICU 2.4
- */
- static void * U_EXPORT2 operator new[](size_t size) U_NO_THROW;
-
- /**
- * Override for ICU4C C++ memory management.
- * 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
- * @stable ICU 2.4
- */
- static void U_EXPORT2 operator delete(void *p) U_NO_THROW;
-
- /**
- * Override for ICU4C C++ memory management.
- * See delete().
- * @stable ICU 2.4
- */
- static void U_EXPORT2 operator delete[](void *p) U_NO_THROW;
-
-#if U_HAVE_PLACEMENT_NEW
- /**
- * Override for ICU4C C++ memory management for STL.
- * See new().
- * @stable ICU 2.6
- */
- static inline void * U_EXPORT2 operator new(size_t, void *ptr) U_NO_THROW { return ptr; }
-
- /**
- * Override for ICU4C C++ memory management for STL.
- * See delete().
- * @stable ICU 2.6
- */
- static inline void U_EXPORT2 operator delete(void *, void *) U_NO_THROW {}
-#endif /* U_HAVE_PLACEMENT_NEW */
-#if U_HAVE_DEBUG_LOCATION_NEW
- /**
- * This method overrides the MFC debug version of the operator new
- *
- * @param size The requested memory size
- * @param file The file where the allocation was requested
- * @param line The line where the allocation was requested
- */
- static void * U_EXPORT2 operator new(size_t size, const char* file, int line) U_NO_THROW;
- /**
- * This method provides a matching delete for the MFC debug new
- *
- * @param p The pointer to the allocated memory
- * @param file The file where the allocation was requested
- * @param line The line where the allocation was requested
- */
- static void U_EXPORT2 operator delete(void* p, const char* file, int line) U_NO_THROW;
-#endif /* U_HAVE_DEBUG_LOCATION_NEW */
-#endif /* U_OVERRIDE_CXX_ALLOCATION */
-
- /*
- * Assignment operator not declared. The compiler will provide one
- * which does nothing since this class does not contain any data members.
- * API/code coverage may show the assignment operator as present and
- * untested - ignore.
- * Subclasses need this assignment operator if they use compiler-provided
- * assignment operators of their own. An alternative to not declaring one
- * here would be to declare and empty-implement a protected or public one.
- UMemory &UMemory::operator=(const UMemory &);
- */
-};
-
-/**
- * UObject is the common ICU "boilerplate" class.
- * UObject inherits UMemory (starting with ICU 2.4),
- * and all other public ICU C++ classes
- * are derived from UObject (starting with ICU 2.2).
- *
- * UObject contains common virtual functions, in particular a virtual destructor.
- *
- * The clone() function is not available in UObject because it is not
- * implemented by all ICU classes.
- * Many ICU services provide a clone() function for their class trees,
- * defined on the service's C++ base class, and all subclasses within that
- * service class tree return a pointer to the service base class
- * (which itself is a subclass of UObject).
- * This is because some compilers do not support covariant (same-as-this)
- * return types; cast to the appropriate subclass if necessary.
- *
- * @stable ICU 2.2
- */
-class U_COMMON_API UObject : public UMemory {
-public:
- /**
- * Destructor.
- *
- * @stable ICU 2.2
- */
- virtual ~UObject();
-
- /**
- * ICU4C "poor man's RTTI", returns a UClassID for the actual ICU class.
- * The base class implementation returns a dummy value.
- *
- * Use compiler RTTI rather than ICU's "poor man's RTTI".
- * Since ICU 4.6, new ICU C++ class hierarchies do not implement "poor man's RTTI".
- *
- * @stable ICU 2.2
- */
- virtual UClassID getDynamicClassID() const;
-
-protected:
- // the following functions are protected to prevent instantiation and
- // direct use of UObject itself
-
- // default constructor
- // inline UObject() {}
-
- // copy constructor
- // inline UObject(const UObject &other) {}
-
-#if 0
- // TODO Sometime in the future. Implement operator==().
- // (This comment inserted in 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 *)
- // see also UObject class documentation.
- // virtual UObject *clone() const;
-#endif
-
- /*
- * Assignment operator not declared. The compiler will provide one
- * which does nothing since this class does not contain any data members.
- * API/code coverage may show the assignment operator as present and
- * untested - ignore.
- * Subclasses need this assignment operator if they use compiler-provided
- * assignment operators of their own. An alternative to not declaring one
- * here would be to declare and empty-implement a protected or public one.
- UObject &UObject::operator=(const UObject &);
- */
-};
-
-#ifndef U_HIDE_INTERNAL_API
-/**
- * This is a simple macro to add ICU RTTI to an ICU object implementation.
- * This does not go into the header. This should only be used in *.cpp files.
- *
- * @param myClass The name of the class that needs RTTI defined.
- * @internal
- */
-#define UOBJECT_DEFINE_RTTI_IMPLEMENTATION(myClass) \
- UClassID U_EXPORT2 myClass::getStaticClassID() { \
- static char classID = 0; \
- return (UClassID)&classID; \
- } \
- UClassID myClass::getDynamicClassID() const \
- { return myClass::getStaticClassID(); }
-
-
-/**
- * This macro adds ICU RTTI to an ICU abstract class implementation.
- * This macro should be invoked in *.cpp files. The corresponding
- * header should declare getStaticClassID.
- *
- * @param myClass The name of the class that needs RTTI defined.
- * @internal
- */
-#define UOBJECT_DEFINE_ABSTRACT_RTTI_IMPLEMENTATION(myClass) \
- UClassID U_EXPORT2 myClass::getStaticClassID() { \
- static char classID = 0; \
- return (UClassID)&classID; \
- }
-
-#endif /* U_HIDE_INTERNAL_API */
-
-U_NAMESPACE_END
-
-#endif