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/*
******************************************************************************
*
* Copyright (C) 2002-2009, 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.
*/
/** U_OVERRIDE_CXX_ALLOCATION - Define this to override operator new and
* delete in UMemory. Enabled by default for ICU.
*
* Enabling forces all allocation of ICU object types to use ICU's
* memory allocation. On Windows, this allows the ICU DLL to be used by
* applications that statically link the C Runtime library, meaning that
* the app and ICU will be using different heaps.
*
* @stable ICU 2.2
*/
#ifndef U_OVERRIDE_CXX_ALLOCATION
#define U_OVERRIDE_CXX_ALLOCATION 1
#endif
/**
* \def U_HAVE_PLACEMENT_NEW
* Define this to define the placement new and
* delete in UMemory for STL.
*
* @stable ICU 2.6
*/
#ifndef U_HAVE_PLACEMENT_NEW
#define U_HAVE_PLACEMENT_NEW 1
#endif
/**
* \def U_HAVE_DEBUG_LOCATION_NEW
* Define this to define the MFC debug
* version of the operator new.
*
* @stable ICU 3.4
*/
#ifndef U_HAVE_DEBUG_LOCATION_NEW
#define U_HAVE_DEBUG_LOCATION_NEW 0
#endif
/**
* \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.
*
* @draft ICU 4.2
*/
#ifndef U_NO_THROW
#define U_NO_THROW throw()
#endif
/**
* 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 like for ICU's "poor man's RTTI".
* It does not contain default implementations of virtual methods
* like getDynamicClassID to allow derived classes such as Format
* to declare these as pure virtual.
*
* 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.
*
* @stable ICU 2.2
*/
virtual 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 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 &);
*/
// Future implementation for RTTI that support subtyping. [alan]
//
// public:
// /**
// * @internal
// */
// static UClassID getStaticClassID();
//
// /**
// * @internal
// */
// UBool instanceOf(UClassID type) const;
};
/**
* 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; \
}
// /**
// * This macro adds ICU RTTI to an ICU concrete class implementation.
// * This macro should be invoked in *.cpp files. The corresponding
// * header should declare getDynamicClassID and getStaticClassID.
// *
// * @param myClass The name of the class that needs RTTI defined.
// * @param myParent The name of the myClass's parent.
// * @internal
// */
/*#define UOBJECT_DEFINE_RTTI_IMPLEMENTATION(myClass, myParent) \
UOBJECT_DEFINE_ABSTRACT_RTTI_IMPLEMENTATION(myClass, myParent) \
UClassID myClass::getDynamicClassID() const { \
return myClass::getStaticClassID(); \
}
*/
U_NAMESPACE_END
#endif