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Name	Size	Permission
alphaindex.h	26.54 KB	-rw-r--r--
appendable.h	8.54 KB	-rw-r--r--
basictz.h	9.99 KB	-rw-r--r--
brkiter.h	27.83 KB	-rw-r--r--
bytestream.h	10.75 KB	-rw-r--r--
bytestrie.h	20.8 KB	-rw-r--r--
bytestriebuilder.h	7.48 KB	-rw-r--r--
calendar.h	107.68 KB	-rw-r--r--
caniter.h	7.53 KB	-rw-r--r--
casemap.h	25.42 KB	-rw-r--r--
char16ptr.h	7.22 KB	-rw-r--r--
chariter.h	23.79 KB	-rw-r--r--
choicfmt.h	23.99 KB	-rw-r--r--
coleitr.h	13.77 KB	-rw-r--r--
coll.h	56.28 KB	-rw-r--r--
compactdecimalformat.h	6.88 KB	-rw-r--r--
curramt.h	3.67 KB	-rw-r--r--
currpinf.h	7.3 KB	-rw-r--r--
currunit.h	4.02 KB	-rw-r--r--
datefmt.h	40.7 KB	-rw-r--r--
dbbi.h	1.19 KB	-rw-r--r--
dcfmtsym.h	20.93 KB	-rw-r--r--
decimfmt.h	87.46 KB	-rw-r--r--
displayoptions.h	7.08 KB	-rw-r--r--
docmain.h	7.46 KB	-rw-r--r--
dtfmtsym.h	38.21 KB	-rw-r--r--
dtintrv.h	3.84 KB	-rw-r--r--
dtitvfmt.h	48.87 KB	-rw-r--r--
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dtptngen.h	28.05 KB	-rw-r--r--
dtrule.h	8.66 KB	-rw-r--r--
edits.h	20.73 KB	-rw-r--r--
enumset.h	2.08 KB	-rw-r--r--
errorcode.h	4.84 KB	-rw-r--r--
fieldpos.h	8.69 KB	-rw-r--r--
filteredbrk.h	5.37 KB	-rw-r--r--
fmtable.h	24.36 KB	-rw-r--r--
format.h	12.5 KB	-rw-r--r--
formattednumber.h	6.28 KB	-rw-r--r--
formattedvalue.h	9.75 KB	-rw-r--r--
fpositer.h	3.03 KB	-rw-r--r--
gender.h	3.35 KB	-rw-r--r--
gregocal.h	30.3 KB	-rw-r--r--
icudataver.h	1.02 KB	-rw-r--r--
icuplug.h	12.1 KB	-rw-r--r--
idna.h	12.71 KB	-rw-r--r--
listformatter.h	8.59 KB	-rw-r--r--
localebuilder.h	11.08 KB	-rw-r--r--
localematcher.h	26.86 KB	-rw-r--r--
localpointer.h	19.55 KB	-rw-r--r--
locdspnm.h	7.12 KB	-rw-r--r--
locid.h	48.31 KB	-rw-r--r--
measfmt.h	11.41 KB	-rw-r--r--
measunit.h	108.23 KB	-rw-r--r--
measure.h	4.68 KB	-rw-r--r--
messageformat2.h	18.13 KB	-rw-r--r--
messageformat2_arguments.h	4.3 KB	-rw-r--r--
messageformat2_data_model.h	123 KB	-rw-r--r--
messageformat2_data_model_name...	784 B	-rw-r--r--
messageformat2_formattable.h	38.29 KB	-rw-r--r--
messageformat2_function_regist...	18 KB	-rw-r--r--
messagepattern.h	33.72 KB	-rw-r--r--
msgfmt.h	44.2 KB	-rw-r--r--
normalizer2.h	34.73 KB	-rw-r--r--
normlzr.h	30.79 KB	-rw-r--r--
nounit.h	2.24 KB	-rw-r--r--
numberformatter.h	90.74 KB	-rw-r--r--
numberrangeformatter.h	26.05 KB	-rw-r--r--
numfmt.h	50.16 KB	-rw-r--r--
numsys.h	7.22 KB	-rw-r--r--
parseerr.h	3.08 KB	-rw-r--r--
parsepos.h	5.56 KB	-rw-r--r--
platform.h	26.66 KB	-rw-r--r--
plurfmt.h	25.07 KB	-rw-r--r--
plurrule.h	20.63 KB	-rw-r--r--
ptypes.h	2.16 KB	-rw-r--r--
putil.h	6.32 KB	-rw-r--r--
rbbi.h	32.04 KB	-rw-r--r--
rbnf.h	50.53 KB	-rw-r--r--
rbtz.h	15.75 KB	-rw-r--r--
regex.h	84.45 KB	-rw-r--r--
region.h	9.2 KB	-rw-r--r--
reldatefmt.h	22.36 KB	-rw-r--r--
rep.h	9.38 KB	-rw-r--r--
resbund.h	18.03 KB	-rw-r--r--
schriter.h	6.09 KB	-rw-r--r--
scientificnumberformatter.h	6.44 KB	-rw-r--r--
search.h	22.21 KB	-rw-r--r--
selfmt.h	14.35 KB	-rw-r--r--
simpleformatter.h	12.58 KB	-rw-r--r--
simplenumberformatter.h	9.18 KB	-rw-r--r--
simpletz.h	45.62 KB	-rw-r--r--
smpdtfmt.h	57.06 KB	-rw-r--r--
sortkey.h	11.12 KB	-rw-r--r--
std_string.h	1.05 KB	-rw-r--r--
strenum.h	9.96 KB	-rw-r--r--
stringoptions.h	5.79 KB	-rw-r--r--
stringpiece.h	10.02 KB	-rw-r--r--
stringtriebuilder.h	15.5 KB	-rw-r--r--
stsearch.h	21.43 KB	-rw-r--r--
symtable.h	4.28 KB	-rw-r--r--
tblcoll.h	36.93 KB	-rw-r--r--
timezone.h	45.64 KB	-rw-r--r--
tmunit.h	3.4 KB	-rw-r--r--
tmutamt.h	4.9 KB	-rw-r--r--
tmutfmt.h	7.42 KB	-rw-r--r--
translit.h	65.8 KB	-rw-r--r--
tzfmt.h	42.95 KB	-rw-r--r--
tznames.h	16.85 KB	-rw-r--r--
tzrule.h	34.81 KB	-rw-r--r--
tztrans.h	6.11 KB	-rw-r--r--
ubidi.h	89.61 KB	-rw-r--r--
ubiditransform.h	12.71 KB	-rw-r--r--
ubrk.h	24.43 KB	-rw-r--r--
ucal.h	64.01 KB	-rw-r--r--
ucasemap.h	15.21 KB	-rw-r--r--
ucat.h	5.35 KB	-rw-r--r--
uchar.h	150.13 KB	-rw-r--r--
ucharstrie.h	22.56 KB	-rw-r--r--
ucharstriebuilder.h	7.48 KB	-rw-r--r--
uchriter.h	13.24 KB	-rw-r--r--
uclean.h	11.21 KB	-rw-r--r--
ucnv.h	83.34 KB	-rw-r--r--
ucnv_cb.h	6.58 KB	-rw-r--r--
ucnv_err.h	20.98 KB	-rw-r--r--
ucnvsel.h	6.24 KB	-rw-r--r--
ucol.h	62.7 KB	-rw-r--r--
ucoleitr.h	9.82 KB	-rw-r--r--
uconfig.h	12.56 KB	-rw-r--r--
ucpmap.h	5.54 KB	-rw-r--r--
ucptrie.h	22.51 KB	-rw-r--r--
ucsdet.h	14.69 KB	-rw-r--r--
ucurr.h	16.72 KB	-rw-r--r--
udat.h	62.36 KB	-rw-r--r--
udata.h	15.63 KB	-rw-r--r--
udateintervalformat.h	11.93 KB	-rw-r--r--
udatpg.h	30.13 KB	-rw-r--r--
udisplaycontext.h	5.94 KB	-rw-r--r--
udisplayoptions.h	8.86 KB	-rw-r--r--
uenum.h	7.79 KB	-rw-r--r--
ufieldpositer.h	4.41 KB	-rw-r--r--
uformattable.h	10.97 KB	-rw-r--r--
uformattednumber.h	8.09 KB	-rw-r--r--
uformattedvalue.h	12.25 KB	-rw-r--r--
ugender.h	2.06 KB	-rw-r--r--
uidna.h	33.43 KB	-rw-r--r--
uiter.h	22.75 KB	-rw-r--r--
uldnames.h	10.48 KB	-rw-r--r--
ulistformatter.h	10.78 KB	-rw-r--r--
uloc.h	55.38 KB	-rw-r--r--
ulocale.h	6.35 KB	-rw-r--r--
ulocbuilder.h	16.73 KB	-rw-r--r--
ulocdata.h	11.3 KB	-rw-r--r--
umachine.h	14.59 KB	-rw-r--r--
umisc.h	1.34 KB	-rw-r--r--
umsg.h	24.25 KB	-rw-r--r--
umutablecptrie.h	8.3 KB	-rw-r--r--
unifilt.h	4 KB	-rw-r--r--
unifunct.h	4.05 KB	-rw-r--r--
unimatch.h	6.1 KB	-rw-r--r--
unirepl.h	3.38 KB	-rw-r--r--
uniset.h	66.82 KB	-rw-r--r--
unistr.h	171.33 KB	-rw-r--r--
unorm.h	20.55 KB	-rw-r--r--
unorm2.h	25.71 KB	-rw-r--r--
unum.h	55.16 KB	-rw-r--r--
unumberformatter.h	19.68 KB	-rw-r--r--
unumberoptions.h	5.23 KB	-rw-r--r--
unumberrangeformatter.h	15.35 KB	-rw-r--r--
unumsys.h	7.26 KB	-rw-r--r--
uobject.h	10.66 KB	-rw-r--r--
upluralrules.h	8.79 KB	-rw-r--r--
uregex.h	71.99 KB	-rw-r--r--
uregion.h	9.81 KB	-rw-r--r--
ureldatefmt.h	16.98 KB	-rw-r--r--
urename.h	141.31 KB	-rw-r--r--
urep.h	5.38 KB	-rw-r--r--
ures.h	36.65 KB	-rw-r--r--
uscript.h	27.89 KB	-rw-r--r--
usearch.h	39.21 KB	-rw-r--r--
uset.h	45.56 KB	-rw-r--r--
usetiter.h	9.63 KB	-rw-r--r--
ushape.h	18 KB	-rw-r--r--
usimplenumberformatter.h	7.63 KB	-rw-r--r--
uspoof.h	80.32 KB	-rw-r--r--
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ustdio.h	38.56 KB	-rw-r--r--
ustream.h	1.89 KB	-rw-r--r--
ustring.h	72.13 KB	-rw-r--r--
ustringtrie.h	3.15 KB	-rw-r--r--
utext.h	58.1 KB	-rw-r--r--
utf.h	7.87 KB	-rw-r--r--
utf16.h	23.35 KB	-rw-r--r--
utf32.h	763 B	-rw-r--r--
utf8.h	30.83 KB	-rw-r--r--
utf_old.h	45.8 KB	-rw-r--r--
utmscale.h	13.78 KB	-rw-r--r--
utrace.h	17.18 KB	-rw-r--r--
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utypes.h	33.71 KB	-rw-r--r--
uvernum.h	6.33 KB	-rw-r--r--
uversion.h	5.99 KB	-rw-r--r--
vtzone.h	20.68 KB	-rw-r--r--

Code Editor : localpointer.h

// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
*
*   Copyright (C) 2009-2016, International Business Machines
*   Corporation and others.  All Rights Reserved.
*
*******************************************************************************
*   file name:  localpointer.h
*   encoding:   UTF-8
*   tab size:   8 (not used)
*   indentation:4
*
*   created on: 2009nov13
*   created by: Markus W. Scherer
*/

#ifndef __LOCALPOINTER_H__
#define __LOCALPOINTER_H__

/**
 * \file
 * \brief C++ API: "Smart pointers" for use with and in ICU4C C++ code.
 *
 * These classes are inspired by
 * - std::auto_ptr
 * - boost::scoped_ptr & boost::scoped_array
 * - Taligent Safe Pointers (TOnlyPointerTo)
 *
 * but none of those provide for all of the goals for ICU smart pointers:
 * - Smart pointer owns the object and releases it when it goes out of scope.
 * - No transfer of ownership via copy/assignment to reduce misuse. Simpler & more robust.
 * - ICU-compatible: No exceptions.
 * - Need to be able to orphan/release the pointer and its ownership.
 * - Need variants for normal C++ object pointers, C++ arrays, and ICU C service objects.
 *
 * For details see https://icu.unicode.org/design/cpp/scoped_ptr
 */

#include "unicode/utypes.h"

#if U_SHOW_CPLUSPLUS_API

#include <memory>

U_NAMESPACE_BEGIN

/**
 * "Smart pointer" base class; do not use directly: use LocalPointer etc.
 *
 * Base class for smart pointer classes that do not throw exceptions.
 *
 * Do not use this base class directly, since it does not delete its pointer.
 * A subclass must implement methods that delete the pointer:
 * Destructor and adoptInstead().
 *
 * There is no operator T *() provided because the programmer must decide
 * whether to use getAlias() (without transfer of ownership) or orphan()
 * (with transfer of ownership and NULLing of the pointer).
 *
 * @see LocalPointer
 * @see LocalArray
 * @see U_DEFINE_LOCAL_OPEN_POINTER
 * @stable ICU 4.4
 */
template<typename T>
class LocalPointerBase {
public:
    // No heap allocation. Use only on the stack.
    static void* U_EXPORT2 operator new(size_t) = delete;
    static void* U_EXPORT2 operator new[](size_t) = delete;
#if U_HAVE_PLACEMENT_NEW
    static void* U_EXPORT2 operator new(size_t, void*) = delete;
#endif

/**
     * Constructor takes ownership.
     * @param p simple pointer to an object that is adopted
     * @stable ICU 4.4
     */
    explicit LocalPointerBase(T *p=nullptr) : ptr(p) {}
    /**
     * Destructor deletes the object it owns.
     * Subclass must override: Base class does nothing.
     * @stable ICU 4.4
     */
    ~LocalPointerBase() { /* delete ptr; */ }
    /**
     * nullptr check.
     * @return true if ==nullptr
     * @stable ICU 4.4
     */
    UBool isNull() const { return ptr==nullptr; }
    /**
     * nullptr check.
     * @return true if !=nullptr
     * @stable ICU 4.4
     */
    UBool isValid() const { return ptr!=nullptr; }
    /**
     * Comparison with a simple pointer, so that existing code
     * with ==nullptr need not be changed.
     * @param other simple pointer for comparison
     * @return true if this pointer value equals other
     * @stable ICU 4.4
     */
    bool operator==(const T *other) const { return ptr==other; }
    /**
     * Comparison with a simple pointer, so that existing code
     * with !=nullptr need not be changed.
     * @param other simple pointer for comparison
     * @return true if this pointer value differs from other
     * @stable ICU 4.4
     */
    bool operator!=(const T *other) const { return ptr!=other; }
    /**
     * Access without ownership change.
     * @return the pointer value
     * @stable ICU 4.4
     */
    T *getAlias() const { return ptr; }
    /**
     * Access without ownership change.
     * @return the pointer value as a reference
     * @stable ICU 4.4
     */
    T &operator*() const { return *ptr; }
    /**
     * Access without ownership change.
     * @return the pointer value
     * @stable ICU 4.4
     */
    T *operator->() const { return ptr; }
    /**
     * Gives up ownership; the internal pointer becomes nullptr.
     * @return the pointer value;
     *         caller becomes responsible for deleting the object
     * @stable ICU 4.4
     */
    T *orphan() {
        T *p=ptr;
        ptr=nullptr;
        return p;
    }
    /**
     * Deletes the object it owns,
     * and adopts (takes ownership of) the one passed in.
     * Subclass must override: Base class does not delete the object.
     * @param p simple pointer to an object that is adopted
     * @stable ICU 4.4
     */
    void adoptInstead(T *p) {
        // delete ptr;
        ptr=p;
    }
protected:
    /**
     * Actual pointer.
     * @internal
     */
    T *ptr;
private:
    // No comparison operators with other LocalPointerBases.
    bool operator==(const LocalPointerBase<T> &other) = delete;
    bool operator!=(const LocalPointerBase<T> &other) = delete;
    // No ownership sharing: No copy constructor, no assignment operator.
    LocalPointerBase(const LocalPointerBase<T> &other) = delete;
    void operator=(const LocalPointerBase<T> &other) = delete;
};

/**
 * "Smart pointer" class, deletes objects via the standard C++ delete operator.
 * For most methods see the LocalPointerBase base class.
 *
 * Usage example:
 * \code
 * LocalPointer<UnicodeString> s(new UnicodeString((UChar32)0x50005));
 * int32_t length=s->length();  // 2
 * char16_t lead=s->charAt(0);  // 0xd900
 * if(some condition) { return; }  // no need to explicitly delete the pointer
 * s.adoptInstead(new UnicodeString((char16_t)0xfffc));
 * length=s->length();  // 1
 * // no need to explicitly delete the pointer
 * \endcode
 *
 * @see LocalPointerBase
 * @stable ICU 4.4
 */
template<typename T>
class LocalPointer : public LocalPointerBase<T> {
public:
    using LocalPointerBase<T>::operator*;
    using LocalPointerBase<T>::operator->;
    /**
     * Constructor takes ownership.
     * @param p simple pointer to an object that is adopted
     * @stable ICU 4.4
     */
    explicit LocalPointer(T *p=nullptr) : LocalPointerBase<T>(p) {}
    /**
     * Constructor takes ownership and reports an error if nullptr.
     *
     * This constructor is intended to be used with other-class constructors
     * that may report a failure UErrorCode,
     * so that callers need to check only for U_FAILURE(errorCode)
     * and not also separately for isNull().
     *
     * @param p simple pointer to an object that is adopted
     * @param errorCode in/out UErrorCode, set to U_MEMORY_ALLOCATION_ERROR
     *     if p==nullptr and no other failure code had been set
     * @stable ICU 55
     */
    LocalPointer(T *p, UErrorCode &errorCode) : LocalPointerBase<T>(p) {
        if(p==nullptr && U_SUCCESS(errorCode)) {
            errorCode=U_MEMORY_ALLOCATION_ERROR;
        }
    }
    /**
     * Move constructor, leaves src with isNull().
     * @param src source smart pointer
     * @stable ICU 56
     */
    LocalPointer(LocalPointer<T> &&src) noexcept : LocalPointerBase<T>(src.ptr) {
        src.ptr=nullptr;
    }

/**
     * Constructs a LocalPointer from a C++11 std::unique_ptr.
     * The LocalPointer steals the object owned by the std::unique_ptr.
     *
     * This constructor works via move semantics. If your std::unique_ptr is
     * in a local variable, you must use std::move.
     *
     * @param p The std::unique_ptr from which the pointer will be stolen.
     * @stable ICU 64
     */
    explicit LocalPointer(std::unique_ptr<T> &&p)
        : LocalPointerBase<T>(p.release()) {}

/**
     * Destructor deletes the object it owns.
     * @stable ICU 4.4
     */
    ~LocalPointer() {
        delete LocalPointerBase<T>::ptr;
    }
    /**
     * Move assignment operator, leaves src with isNull().
     * The behavior is undefined if *this and src are the same object.
     * @param src source smart pointer
     * @return *this
     * @stable ICU 56
     */
    LocalPointer<T> &operator=(LocalPointer<T> &&src) noexcept {
        delete LocalPointerBase<T>::ptr;
        LocalPointerBase<T>::ptr=src.ptr;
        src.ptr=nullptr;
        return *this;
    }

/**
     * Move-assign from an std::unique_ptr to this LocalPointer.
     * Steals the pointer from the std::unique_ptr.
     *
     * @param p The std::unique_ptr from which the pointer will be stolen.
     * @return *this
     * @stable ICU 64
     */
    LocalPointer<T> &operator=(std::unique_ptr<T> &&p) noexcept {
        adoptInstead(p.release());
        return *this;
    }

/**
     * Swap pointers.
     * @param other other smart pointer
     * @stable ICU 56
     */
    void swap(LocalPointer<T> &other) noexcept {
        T *temp=LocalPointerBase<T>::ptr;
        LocalPointerBase<T>::ptr=other.ptr;
        other.ptr=temp;
    }
    /**
     * Non-member LocalPointer swap function.
     * @param p1 will get p2's pointer
     * @param p2 will get p1's pointer
     * @stable ICU 56
     */
    friend inline void swap(LocalPointer<T> &p1, LocalPointer<T> &p2) noexcept {
        p1.swap(p2);
    }
    /**
     * Deletes the object it owns,
     * and adopts (takes ownership of) the one passed in.
     * @param p simple pointer to an object that is adopted
     * @stable ICU 4.4
     */
    void adoptInstead(T *p) {
        delete LocalPointerBase<T>::ptr;
        LocalPointerBase<T>::ptr=p;
    }
    /**
     * Deletes the object it owns,
     * and adopts (takes ownership of) the one passed in.
     *
     * If U_FAILURE(errorCode), then the current object is retained and the new one deleted.
     *
     * If U_SUCCESS(errorCode) but the input pointer is nullptr,
     * then U_MEMORY_ALLOCATION_ERROR is set,
     * the current object is deleted, and nullptr is set.
     *
     * @param p simple pointer to an object that is adopted
     * @param errorCode in/out UErrorCode, set to U_MEMORY_ALLOCATION_ERROR
     *     if p==nullptr and no other failure code had been set
     * @stable ICU 55
     */
    void adoptInsteadAndCheckErrorCode(T *p, UErrorCode &errorCode) {
        if(U_SUCCESS(errorCode)) {
            delete LocalPointerBase<T>::ptr;
            LocalPointerBase<T>::ptr=p;
            if(p==nullptr) {
                errorCode=U_MEMORY_ALLOCATION_ERROR;
            }
        } else {
            delete p;
        }
    }

/**
     * Conversion operator to a C++11 std::unique_ptr.
     * Disowns the object and gives it to the returned std::unique_ptr.
     *
     * This operator works via move semantics. If your LocalPointer is
     * in a local variable, you must use std::move.
     *
     * @return An std::unique_ptr owning the pointer previously owned by this
     *         icu::LocalPointer.
     * @stable ICU 64
     */
    operator std::unique_ptr<T> () && {
        return std::unique_ptr<T>(LocalPointerBase<T>::orphan());
    }
};

/**
 * "Smart pointer" class, deletes objects via the C++ array delete[] operator.
 * For most methods see the LocalPointerBase base class.
 * Adds operator[] for array item access.
 *
 * Usage example:
 * \code
 * LocalArray<UnicodeString> a(new UnicodeString[2]);
 * a[0].append((char16_t)0x61);
 * if(some condition) { return; }  // no need to explicitly delete the array
 * a.adoptInstead(new UnicodeString[4]);
 * a[3].append((char16_t)0x62).append((char16_t)0x63).reverse();
 * // no need to explicitly delete the array
 * \endcode
 *
 * @see LocalPointerBase
 * @stable ICU 4.4
 */
template<typename T>
class LocalArray : public LocalPointerBase<T> {
public:
    using LocalPointerBase<T>::operator*;
    using LocalPointerBase<T>::operator->;
    /**
     * Constructor takes ownership.
     * @param p simple pointer to an array of T objects that is adopted
     * @stable ICU 4.4
     */
    explicit LocalArray(T *p=nullptr) : LocalPointerBase<T>(p) {}
    /**
     * Constructor takes ownership and reports an error if nullptr.
     *
     * This constructor is intended to be used with other-class constructors
     * that may report a failure UErrorCode,
     * so that callers need to check only for U_FAILURE(errorCode)
     * and not also separately for isNull().
     *
     * @param p simple pointer to an array of T objects that is adopted
     * @param errorCode in/out UErrorCode, set to U_MEMORY_ALLOCATION_ERROR
     *     if p==nullptr and no other failure code had been set
     * @stable ICU 56
     */
    LocalArray(T *p, UErrorCode &errorCode) : LocalPointerBase<T>(p) {
        if(p==nullptr && U_SUCCESS(errorCode)) {
            errorCode=U_MEMORY_ALLOCATION_ERROR;
        }
    }
    /**
     * Move constructor, leaves src with isNull().
     * @param src source smart pointer
     * @stable ICU 56
     */
    LocalArray(LocalArray<T> &&src) noexcept : LocalPointerBase<T>(src.ptr) {
        src.ptr=nullptr;
    }

/**
     * Constructs a LocalArray from a C++11 std::unique_ptr of an array type.
     * The LocalPointer steals the array owned by the std::unique_ptr.
     *
     * This constructor works via move semantics. If your std::unique_ptr is
     * in a local variable, you must use std::move.
     *
     * @param p The std::unique_ptr from which the array will be stolen.
     * @stable ICU 64
     */
    explicit LocalArray(std::unique_ptr<T[]> &&p)
        : LocalPointerBase<T>(p.release()) {}

/**
     * Destructor deletes the array it owns.
     * @stable ICU 4.4
     */
    ~LocalArray() {
        delete[] LocalPointerBase<T>::ptr;
    }
    /**
     * Move assignment operator, leaves src with isNull().
     * The behavior is undefined if *this and src are the same object.
     * @param src source smart pointer
     * @return *this
     * @stable ICU 56
     */
    LocalArray<T> &operator=(LocalArray<T> &&src) noexcept {
        delete[] LocalPointerBase<T>::ptr;
        LocalPointerBase<T>::ptr=src.ptr;
        src.ptr=nullptr;
        return *this;
    }

/**
     * Move-assign from an std::unique_ptr to this LocalPointer.
     * Steals the array from the std::unique_ptr.
     *
     * @param p The std::unique_ptr from which the array will be stolen.
     * @return *this
     * @stable ICU 64
     */
    LocalArray<T> &operator=(std::unique_ptr<T[]> &&p) noexcept {
        adoptInstead(p.release());
        return *this;
    }

/**
     * Swap pointers.
     * @param other other smart pointer
     * @stable ICU 56
     */
    void swap(LocalArray<T> &other) noexcept {
        T *temp=LocalPointerBase<T>::ptr;
        LocalPointerBase<T>::ptr=other.ptr;
        other.ptr=temp;
    }
    /**
     * Non-member LocalArray swap function.
     * @param p1 will get p2's pointer
     * @param p2 will get p1's pointer
     * @stable ICU 56
     */
    friend inline void swap(LocalArray<T> &p1, LocalArray<T> &p2) noexcept {
        p1.swap(p2);
    }
    /**
     * Deletes the array it owns,
     * and adopts (takes ownership of) the one passed in.
     * @param p simple pointer to an array of T objects that is adopted
     * @stable ICU 4.4
     */
    void adoptInstead(T *p) {
        delete[] LocalPointerBase<T>::ptr;
        LocalPointerBase<T>::ptr=p;
    }
    /**
     * Deletes the array it owns,
     * and adopts (takes ownership of) the one passed in.
     *
     * If U_FAILURE(errorCode), then the current array is retained and the new one deleted.
     *
     * If U_SUCCESS(errorCode) but the input pointer is nullptr,
     * then U_MEMORY_ALLOCATION_ERROR is set,
     * the current array is deleted, and nullptr is set.
     *
     * @param p simple pointer to an array of T objects that is adopted
     * @param errorCode in/out UErrorCode, set to U_MEMORY_ALLOCATION_ERROR
     *     if p==nullptr and no other failure code had been set
     * @stable ICU 56
     */
    void adoptInsteadAndCheckErrorCode(T *p, UErrorCode &errorCode) {
        if(U_SUCCESS(errorCode)) {
            delete[] LocalPointerBase<T>::ptr;
            LocalPointerBase<T>::ptr=p;
            if(p==nullptr) {
                errorCode=U_MEMORY_ALLOCATION_ERROR;
            }
        } else {
            delete[] p;
        }
    }
    /**
     * Array item access (writable).
     * No index bounds check.
     * @param i array index
     * @return reference to the array item
     * @stable ICU 4.4
     */
    T &operator[](ptrdiff_t i) const { return LocalPointerBase<T>::ptr[i]; }

/**
     * Conversion operator to a C++11 std::unique_ptr.
     * Disowns the object and gives it to the returned std::unique_ptr.
     *
     * This operator works via move semantics. If your LocalPointer is
     * in a local variable, you must use std::move.
     *
     * @return An std::unique_ptr owning the pointer previously owned by this
     *         icu::LocalPointer.
     * @stable ICU 64
     */
    operator std::unique_ptr<T[]> () && {
        return std::unique_ptr<T[]>(LocalPointerBase<T>::orphan());
    }
};

/**
 * \def U_DEFINE_LOCAL_OPEN_POINTER
 * "Smart pointer" definition macro, deletes objects via the closeFunction.
 * Defines a subclass of LocalPointerBase which works just
 * like LocalPointer<Type> except that this subclass will use the closeFunction
 * rather than the C++ delete operator.
 *
 * Usage example:
 * \code
 * LocalUCaseMapPointer csm(ucasemap_open(localeID, options, &errorCode));
 * utf8OutLength=ucasemap_utf8ToLower(csm.getAlias(),
 *     utf8Out, (int32_t)sizeof(utf8Out),
 *     utf8In, utf8InLength, &errorCode);
 * if(U_FAILURE(errorCode)) { return; }  // no need to explicitly delete the UCaseMap
 * \endcode
 *
 * @see LocalPointerBase
 * @see LocalPointer
 * @stable ICU 4.4
 */
#define U_DEFINE_LOCAL_OPEN_POINTER(LocalPointerClassName, Type, closeFunction) \
    using LocalPointerClassName = internal::LocalOpenPointer<Type, closeFunction>

#ifndef U_IN_DOXYGEN
namespace internal {
/**
 * Implementation, do not use directly: use U_DEFINE_LOCAL_OPEN_POINTER.
 *
 * @see U_DEFINE_LOCAL_OPEN_POINTER
 * @internal
 */
template <typename Type, auto closeFunction>
class LocalOpenPointer : public LocalPointerBase<Type> {
    using LocalPointerBase<Type>::ptr;
public:
    using LocalPointerBase<Type>::operator*;
    using LocalPointerBase<Type>::operator->;
    explicit LocalOpenPointer(Type *p=nullptr) : LocalPointerBase<Type>(p) {}
    LocalOpenPointer(LocalOpenPointer &&src) noexcept
            : LocalPointerBase<Type>(src.ptr) {
        src.ptr=nullptr;
    }
    /* TODO: Be agnostic of the deleter function signature from the user-provided std::unique_ptr? */
    explicit LocalOpenPointer(std::unique_ptr<Type, decltype(closeFunction)> &&p)
            : LocalPointerBase<Type>(p.release()) {}
    ~LocalOpenPointer() { if (ptr != nullptr) { closeFunction(ptr); } }
    LocalOpenPointer &operator=(LocalOpenPointer &&src) noexcept {
        if (ptr != nullptr) { closeFunction(ptr); }
        LocalPointerBase<Type>::ptr=src.ptr;
        src.ptr=nullptr;
        return *this;
    }
    /* TODO: Be agnostic of the deleter function signature from the user-provided std::unique_ptr? */
    LocalOpenPointer &operator=(std::unique_ptr<Type, decltype(closeFunction)> &&p) {
        adoptInstead(p.release());
        return *this;
    }
    void swap(LocalOpenPointer &other) noexcept {
        Type *temp=LocalPointerBase<Type>::ptr;
        LocalPointerBase<Type>::ptr=other.ptr;
        other.ptr=temp;
    }
    friend inline void swap(LocalOpenPointer &p1, LocalOpenPointer &p2) noexcept {
        p1.swap(p2);
    }
    void adoptInstead(Type *p) {
        if (ptr != nullptr) { closeFunction(ptr); }
        ptr=p;
    }
    operator std::unique_ptr<Type, decltype(closeFunction)> () && {
        return std::unique_ptr<Type, decltype(closeFunction)>(LocalPointerBase<Type>::orphan(), closeFunction);
    }
};
}  // namespace internal
#endif

U_NAMESPACE_END

#endif  /* U_SHOW_CPLUSPLUS_API */
#endif  /* __LOCALPOINTER_H__ */

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Code Editor : localpointer.h