uobject.h

Go to the documentation of this file.

// © 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"
#include "unicode/platform.h"

#ifndef U_NO_THROW
#define U_NO_THROW throw()
#endif

/*===========================================================================*/
/* UClassID-based RTTI */
/*===========================================================================*/

typedef void* UClassID;

U_NAMESPACE_BEGIN

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

    static void * U_EXPORT2 operator new(size_t size) U_NOEXCEPT;

    static void * U_EXPORT2 operator new[](size_t size) U_NOEXCEPT;

    static void U_EXPORT2 operator delete(void *p) U_NOEXCEPT;

    static void U_EXPORT2 operator delete[](void *p) U_NOEXCEPT;

#if U_HAVE_PLACEMENT_NEW

    static inline void * U_EXPORT2 operator new(size_t, void *ptr) U_NOEXCEPT { return ptr; }

    static inline void U_EXPORT2 operator delete(void *, void *) U_NOEXCEPT {}
#endif /* U_HAVE_PLACEMENT_NEW */
#if U_HAVE_DEBUG_LOCATION_NEW

    static void * U_EXPORT2 operator new(size_t size, const char* file, int line) U_NOEXCEPT;
    static void U_EXPORT2 operator delete(void* p, const char* file, int line) U_NOEXCEPT;
#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 &);
     */
};

class U_COMMON_API UObject : public UMemory {
public:
    virtual ~UObject();

    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

#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(); }


#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