323 lines
11 KiB
C++
323 lines
11 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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******************************************************************************
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*
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* Copyright (C) 2002-2012, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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******************************************************************************
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* file name: uobject.h
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* encoding: UTF-8
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 2002jun26
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* created by: Markus W. Scherer
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*/
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#ifndef __UOBJECT_H__
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#define __UOBJECT_H__
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#include "unicode/utypes.h"
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/**
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* \file
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* \brief C++ API: Common ICU base class UObject.
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*/
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/**
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* @{
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* \def U_NO_THROW
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* Define this to define the throw() specification so
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* certain functions do not throw any exceptions
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*
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* UMemory operator new methods should have the throw() specification
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* appended to them, so that the compiler adds the additional NULL check
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* before calling constructors. Without, if <code>operator new</code> returns NULL the
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* constructor is still called, and if the constructor references member
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* data, (which it typically does), the result is a segmentation violation.
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*
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* @stable ICU 4.2
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*/
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#ifndef U_NO_THROW
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#define U_NO_THROW throw()
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#endif
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/** @} */
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/*===========================================================================*/
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/* UClassID-based RTTI */
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/*===========================================================================*/
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/**
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* UClassID is used to identify classes without using the compiler's RTTI.
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* This was used before C++ compilers consistently supported RTTI.
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* ICU 4.6 requires compiler RTTI to be turned on.
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*
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* Each class hierarchy which needs
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* to implement polymorphic clone() or operator==() defines two methods,
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* described in detail below. UClassID values can be compared using
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* operator==(). Nothing else should be done with them.
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*
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* \par
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* In class hierarchies that implement "poor man's RTTI",
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* each concrete subclass implements getDynamicClassID() in the same way:
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*
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* \code
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* class Derived {
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* public:
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* virtual UClassID getDynamicClassID() const
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* { return Derived::getStaticClassID(); }
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* }
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* \endcode
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*
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* Each concrete class implements getStaticClassID() as well, which allows
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* clients to test for a specific type.
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*
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* \code
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* class Derived {
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* public:
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* static UClassID U_EXPORT2 getStaticClassID();
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* private:
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* static char fgClassID;
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* }
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*
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* // In Derived.cpp:
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* UClassID Derived::getStaticClassID()
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* { return (UClassID)&Derived::fgClassID; }
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* char Derived::fgClassID = 0; // Value is irrelevant
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* \endcode
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* @stable ICU 2.0
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*/
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typedef void* UClassID;
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U_NAMESPACE_BEGIN
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/**
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* UMemory is the common ICU base class.
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* All other ICU C++ classes are derived from UMemory (starting with ICU 2.4).
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*
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* This is primarily to make it possible and simple to override the
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* C++ memory management by adding new/delete operators to this base class.
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*
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* To override ALL ICU memory management, including that from plain C code,
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* replace the allocation functions declared in cmemory.h
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*
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* UMemory does not contain any virtual functions.
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* Common "boilerplate" functions are defined in UObject.
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*
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* @stable ICU 2.4
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*/
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class U_COMMON_API UMemory {
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public:
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/* test versions for debugging shaper heap memory problems */
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#ifdef SHAPER_MEMORY_DEBUG
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static void * NewArray(int size, int count);
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static void * GrowArray(void * array, int newSize );
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static void FreeArray(void * array );
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#endif
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#if U_OVERRIDE_CXX_ALLOCATION
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/**
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* Override for ICU4C C++ memory management.
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* simple, non-class types are allocated using the macros in common/cmemory.h
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* (uprv_malloc(), uprv_free(), uprv_realloc());
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* they or something else could be used here to implement C++ new/delete
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* for ICU4C C++ classes
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* @stable ICU 2.4
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*/
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static void * U_EXPORT2 operator new(size_t size) U_NO_THROW;
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/**
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* Override for ICU4C C++ memory management.
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* See new().
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* @stable ICU 2.4
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*/
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static void * U_EXPORT2 operator new[](size_t size) U_NO_THROW;
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/**
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* Override for ICU4C C++ memory management.
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* simple, non-class types are allocated using the macros in common/cmemory.h
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* (uprv_malloc(), uprv_free(), uprv_realloc());
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* they or something else could be used here to implement C++ new/delete
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* for ICU4C C++ classes
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* @stable ICU 2.4
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*/
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static void U_EXPORT2 operator delete(void *p) U_NO_THROW;
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/**
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* Override for ICU4C C++ memory management.
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* See delete().
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* @stable ICU 2.4
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*/
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static void U_EXPORT2 operator delete[](void *p) U_NO_THROW;
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#if U_HAVE_PLACEMENT_NEW
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/**
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* Override for ICU4C C++ memory management for STL.
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* See new().
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* @stable ICU 2.6
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*/
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static inline void * U_EXPORT2 operator new(size_t, void *ptr) U_NO_THROW { return ptr; }
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/**
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* Override for ICU4C C++ memory management for STL.
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* See delete().
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* @stable ICU 2.6
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*/
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static inline void U_EXPORT2 operator delete(void *, void *) U_NO_THROW {}
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#endif /* U_HAVE_PLACEMENT_NEW */
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#if U_HAVE_DEBUG_LOCATION_NEW
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/**
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* This method overrides the MFC debug version of the operator new
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*
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* @param size The requested memory size
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* @param file The file where the allocation was requested
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* @param line The line where the allocation was requested
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*/
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static void * U_EXPORT2 operator new(size_t size, const char* file, int line) U_NO_THROW;
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/**
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* This method provides a matching delete for the MFC debug new
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*
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* @param p The pointer to the allocated memory
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* @param file The file where the allocation was requested
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* @param line The line where the allocation was requested
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*/
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static void U_EXPORT2 operator delete(void* p, const char* file, int line) U_NO_THROW;
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#endif /* U_HAVE_DEBUG_LOCATION_NEW */
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#endif /* U_OVERRIDE_CXX_ALLOCATION */
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/*
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* Assignment operator not declared. The compiler will provide one
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* which does nothing since this class does not contain any data members.
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* API/code coverage may show the assignment operator as present and
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* untested - ignore.
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* Subclasses need this assignment operator if they use compiler-provided
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* assignment operators of their own. An alternative to not declaring one
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* here would be to declare and empty-implement a protected or public one.
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UMemory &UMemory::operator=(const UMemory &);
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*/
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};
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/**
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* UObject is the common ICU "boilerplate" class.
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* UObject inherits UMemory (starting with ICU 2.4),
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* and all other public ICU C++ classes
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* are derived from UObject (starting with ICU 2.2).
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*
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* UObject contains common virtual functions, in particular a virtual destructor.
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*
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* The clone() function is not available in UObject because it is not
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* implemented by all ICU classes.
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* Many ICU services provide a clone() function for their class trees,
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* defined on the service's C++ base class, and all subclasses within that
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* service class tree return a pointer to the service base class
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* (which itself is a subclass of UObject).
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* This is because some compilers do not support covariant (same-as-this)
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* return types; cast to the appropriate subclass if necessary.
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*
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* @stable ICU 2.2
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*/
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class U_COMMON_API UObject : public UMemory {
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public:
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/**
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* Destructor.
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*
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* @stable ICU 2.2
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*/
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virtual ~UObject();
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/**
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* ICU4C "poor man's RTTI", returns a UClassID for the actual ICU class.
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* The base class implementation returns a dummy value.
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*
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* Use compiler RTTI rather than ICU's "poor man's RTTI".
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* Since ICU 4.6, new ICU C++ class hierarchies do not implement "poor man's RTTI".
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*
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* @stable ICU 2.2
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*/
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virtual UClassID getDynamicClassID() const;
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protected:
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// the following functions are protected to prevent instantiation and
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// direct use of UObject itself
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// default constructor
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// inline UObject() {}
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// copy constructor
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// inline UObject(const UObject &other) {}
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#if 0
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// TODO Sometime in the future. Implement operator==().
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// (This comment inserted in 2.2)
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// some or all of the following "boilerplate" functions may be made public
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// in a future ICU4C release when all subclasses implement them
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// assignment operator
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// (not virtual, see "Taligent's Guide to Designing Programs" pp.73..74)
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// commented out because the implementation is the same as a compiler's default
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// UObject &operator=(const UObject &other) { return *this; }
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// comparison operators
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virtual inline UBool operator==(const UObject &other) const { return this==&other; }
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inline UBool operator!=(const UObject &other) const { return !operator==(other); }
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// clone() commented out from the base class:
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// some compilers do not support co-variant return types
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// (i.e., subclasses would have to return UObject * as well, instead of SubClass *)
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// see also UObject class documentation.
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// virtual UObject *clone() const;
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#endif
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/*
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* Assignment operator not declared. The compiler will provide one
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* which does nothing since this class does not contain any data members.
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* API/code coverage may show the assignment operator as present and
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* untested - ignore.
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* Subclasses need this assignment operator if they use compiler-provided
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* assignment operators of their own. An alternative to not declaring one
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* here would be to declare and empty-implement a protected or public one.
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UObject &UObject::operator=(const UObject &);
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*/
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};
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#ifndef U_HIDE_INTERNAL_API
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/**
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* This is a simple macro to add ICU RTTI to an ICU object implementation.
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* This does not go into the header. This should only be used in *.cpp files.
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*
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* @param myClass The name of the class that needs RTTI defined.
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* @internal
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*/
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#define UOBJECT_DEFINE_RTTI_IMPLEMENTATION(myClass) \
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UClassID U_EXPORT2 myClass::getStaticClassID() { \
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static char classID = 0; \
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return (UClassID)&classID; \
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} \
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UClassID myClass::getDynamicClassID() const \
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{ return myClass::getStaticClassID(); }
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/**
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* This macro adds ICU RTTI to an ICU abstract class implementation.
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* This macro should be invoked in *.cpp files. The corresponding
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* header should declare getStaticClassID.
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*
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* @param myClass The name of the class that needs RTTI defined.
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* @internal
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*/
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#define UOBJECT_DEFINE_ABSTRACT_RTTI_IMPLEMENTATION(myClass) \
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UClassID U_EXPORT2 myClass::getStaticClassID() { \
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static char classID = 0; \
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return (UClassID)&classID; \
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}
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#endif /* U_HIDE_INTERNAL_API */
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U_NAMESPACE_END
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#endif
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