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 // © 2016 and later: Unicode, Inc. and others.
 // License & terms of use: http://www.unicode.org/copyright.html
 /*
 *******************************************************************************
 * Copyright (C) 2007-2008, International Business Machines Corporation and    *
 * others. All Rights Reserved.                                                *
 *******************************************************************************
 */
 #ifndef TZRULE_H
 #define TZRULE_H
 
 /**
  * \file 
  * \brief C++ API: Time zone rule classes
  */
 
 #include "unicode/utypes.h"
 
 #if U_SHOW_CPLUSPLUS_API
 
 #if !UCONFIG_NO_FORMATTING
 
 #include "unicode/uobject.h"
 #include "unicode/unistr.h"
 #include "unicode/dtrule.h"
 
 U_NAMESPACE_BEGIN
 
 /**
  * <code>TimeZoneRule</code> is a class representing a rule for time zone.
  * <code>TimeZoneRule</code> has a set of time zone attributes, such as zone name,
  * raw offset (UTC offset for standard time) and daylight saving time offset.
  * 
  * @stable ICU 3.8
  */
 class U_I18N_API TimeZoneRule : public UObject {
 public:
     /**
      * Destructor.
      * @stable ICU 3.8
      */
     virtual ~TimeZoneRule();
 
     /**
      * Clone this TimeZoneRule object polymorphically. The caller owns the result and
      * should delete it when done.
      * @return  A copy of the object.
      * @stable ICU 3.8
      */
     virtual TimeZoneRule* clone() const = 0;
 
     /**
      * Return true if the given <code>TimeZoneRule</code> objects are semantically equal. Objects
      * of different subclasses are considered unequal.
      * @param that  The object to be compared with.
      * @return  true if the given <code>TimeZoneRule</code> objects are semantically equal.
      * @stable ICU 3.8
      */
     virtual bool operator==(const TimeZoneRule& that) const;
 
     /**
      * Return true if the given <code>TimeZoneRule</code> objects are semantically unequal. Objects
      * of different subclasses are considered unequal.
      * @param that  The object to be compared with.
      * @return  true if the given <code>TimeZoneRule</code> objects are semantically unequal.
      * @stable ICU 3.8
      */
     virtual bool operator!=(const TimeZoneRule& that) const;
 
     /**
      * Fills in "name" with the name of this time zone.
      * @param name  Receives the name of this time zone.
      * @return  A reference to "name"
      * @stable ICU 3.8
      */
     UnicodeString& getName(UnicodeString& name) const;
 
     /**
      * Gets the standard time offset.
      * @return  The standard time offset from UTC in milliseconds.
      * @stable ICU 3.8
      */
     int32_t getRawOffset(void) const;
 
     /**
      * Gets the amount of daylight saving delta time from the standard time.
      * @return  The amount of daylight saving offset used by this rule
      *          in milliseconds.
      * @stable ICU 3.8
      */
     int32_t getDSTSavings(void) const;
 
     /**
      * Returns if this rule represents the same rule and offsets as another.
      * When two <code>TimeZoneRule</code> objects differ only its names, this method
      * returns true.
      * @param other The <code>TimeZoneRule</code> object to be compared with.
      * @return  true if the other <code>TimeZoneRule</code> is the same as this one.
      * @stable ICU 3.8
      */
     virtual UBool isEquivalentTo(const TimeZoneRule& other) const;
 
     /**
      * Gets the very first time when this rule takes effect.
      * @param prevRawOffset     The standard time offset from UTC before this rule
      *                          takes effect in milliseconds.
      * @param prevDSTSavings    The amount of daylight saving offset from the
      *                          standard time.
      * @param result            Receives the very first time when this rule takes effect.
      * @return  true if the start time is available.  When false is returned, output parameter
      *          "result" is unchanged.
      * @stable ICU 3.8
      */
     virtual UBool getFirstStart(int32_t prevRawOffset, int32_t prevDSTSavings, UDate& result) const = 0;
 
     /**
      * Gets the final time when this rule takes effect.
      * @param prevRawOffset     The standard time offset from UTC before this rule
      *                          takes effect in milliseconds.
      * @param prevDSTSavings    The amount of daylight saving offset from the
      *                          standard time.
      * @param result            Receives the final time when this rule takes effect.
      * @return  true if the start time is available.  When false is returned, output parameter
      *          "result" is unchanged.
      * @stable ICU 3.8
      */
     virtual UBool getFinalStart(int32_t prevRawOffset, int32_t prevDSTSavings, UDate& result) const = 0;
 
     /**
      * Gets the first time when this rule takes effect after the specified time.
      * @param base              The first start time after this base time will be returned.
      * @param prevRawOffset     The standard time offset from UTC before this rule
      *                          takes effect in milliseconds.
      * @param prevDSTSavings    The amount of daylight saving offset from the
      *                          standard time.
      * @param inclusive         Whether the base time is inclusive or not.
      * @param result            Receives The first time when this rule takes effect after
      *                          the specified base time.
      * @return  true if the start time is available.  When false is returned, output parameter
      *          "result" is unchanged.
      * @stable ICU 3.8
      */
     virtual UBool getNextStart(UDate base, int32_t prevRawOffset, int32_t prevDSTSavings,
         UBool inclusive, UDate& result) const = 0;
 
     /**
      * Gets the most recent time when this rule takes effect before the specified time.
      * @param base              The most recent time before this base time will be returned.
      * @param prevRawOffset     The standard time offset from UTC before this rule
      *                          takes effect in milliseconds.
      * @param prevDSTSavings    The amount of daylight saving offset from the
      *                          standard time.
      * @param inclusive         Whether the base time is inclusive or not.
      * @param result            Receives The most recent time when this rule takes effect before
      *                          the specified base time.
      * @return  true if the start time is available.  When false is returned, output parameter
      *          "result" is unchanged.
      * @stable ICU 3.8
      */
     virtual UBool getPreviousStart(UDate base, int32_t prevRawOffset, int32_t prevDSTSavings,
         UBool inclusive, UDate& result) const = 0;
 
 protected:
 
     /**
      * Constructs a <code>TimeZoneRule</code> with the name, the GMT offset of its
      * standard time and the amount of daylight saving offset adjustment.
      * @param name          The time zone name.
      * @param rawOffset     The UTC offset of its standard time in milliseconds.
      * @param dstSavings    The amount of daylight saving offset adjustment in milliseconds.
      *                      If this ia a rule for standard time, the value of this argument is 0.
      * @stable ICU 3.8
      */
     TimeZoneRule(const UnicodeString& name, int32_t rawOffset, int32_t dstSavings);
 
     /**
      * Copy constructor.
      * @param source    The TimeZoneRule object to be copied.
      * @stable ICU 3.8
      */
     TimeZoneRule(const TimeZoneRule& source);
 
     /**
      * Assignment operator.
      * @param right The object to be copied.
      * @stable ICU 3.8
      */
     TimeZoneRule& operator=(const TimeZoneRule& right);
 
 private:
     UnicodeString fName; // time name
     int32_t fRawOffset;  // UTC offset of the standard time in milliseconds
     int32_t fDSTSavings; // DST saving amount in milliseconds
 };
 
 /**
  * <code>InitialTimeZoneRule</code> represents a time zone rule
  * representing a time zone effective from the beginning and
  * has no actual start times.
  * @stable ICU 3.8
  */
 class U_I18N_API InitialTimeZoneRule : public TimeZoneRule {
 public:
     /**
      * Constructs an <code>InitialTimeZoneRule</code> with the name, the GMT offset of its
      * standard time and the amount of daylight saving offset adjustment.
      * @param name          The time zone name.
      * @param rawOffset     The UTC offset of its standard time in milliseconds.
      * @param dstSavings    The amount of daylight saving offset adjustment in milliseconds.
      *                      If this ia a rule for standard time, the value of this argument is 0.
      * @stable ICU 3.8
      */
     InitialTimeZoneRule(const UnicodeString& name, int32_t rawOffset, int32_t dstSavings);
 
     /**
      * Copy constructor.
      * @param source    The InitialTimeZoneRule object to be copied.
      * @stable ICU 3.8
      */
     InitialTimeZoneRule(const InitialTimeZoneRule& source);
 
     /**
      * Destructor.
      * @stable ICU 3.8
      */
     virtual ~InitialTimeZoneRule();
 
     /**
      * Clone this InitialTimeZoneRule object polymorphically. The caller owns the result and
      * should delete it when done.
      * @return    A copy of the object.
      * @stable ICU 3.8
      */
     virtual InitialTimeZoneRule* clone() const override;
 
     /**
      * Assignment operator.
      * @param right The object to be copied.
      * @stable ICU 3.8
      */
     InitialTimeZoneRule& operator=(const InitialTimeZoneRule& right);
 
     /**
      * Return true if the given <code>TimeZoneRule</code> objects are semantically equal. Objects
      * of different subclasses are considered unequal.
      * @param that  The object to be compared with.
      * @return  true if the given <code>TimeZoneRule</code> objects are semantically equal.
      * @stable ICU 3.8
      */
     virtual bool operator==(const TimeZoneRule& that) const override;
 
     /**
      * Return true if the given <code>TimeZoneRule</code> objects are semantically unequal. Objects
      * of different subclasses are considered unequal.
      * @param that  The object to be compared with.
      * @return  true if the given <code>TimeZoneRule</code> objects are semantically unequal.
      * @stable ICU 3.8
      */
     virtual bool operator!=(const TimeZoneRule& that) const override;
 
     /**
      * Returns if this rule represents the same rule and offsets as another.
      * When two <code>TimeZoneRule</code> objects differ only its names, this method
      * returns true.
      * @param that  The <code>TimeZoneRule</code> object to be compared with.
      * @return  true if the other <code>TimeZoneRule</code> is equivalent to this one.
      * @stable ICU 3.8
      */
     virtual UBool isEquivalentTo(const TimeZoneRule& that) const override;
 
     /**
      * Gets the very first time when this rule takes effect.
      * @param prevRawOffset     The standard time offset from UTC before this rule
      *                          takes effect in milliseconds.
      * @param prevDSTSavings    The amount of daylight saving offset from the
      *                          standard time.
      * @param result            Receives the very first time when this rule takes effect.
      * @return  true if the start time is available.  When false is returned, output parameter
      *          "result" is unchanged.
      * @stable ICU 3.8
      */
     virtual UBool getFirstStart(int32_t prevRawOffset, int32_t prevDSTSavings, UDate& result) const override;
 
     /**
      * Gets the final time when this rule takes effect.
      * @param prevRawOffset     The standard time offset from UTC before this rule
      *                          takes effect in milliseconds.
      * @param prevDSTSavings    The amount of daylight saving offset from the
      *                          standard time.
      * @param result            Receives the final time when this rule takes effect.
      * @return  true if the start time is available.  When false is returned, output parameter
      *          "result" is unchanged.
      * @stable ICU 3.8
      */
     virtual UBool getFinalStart(int32_t prevRawOffset, int32_t prevDSTSavings, UDate& result) const override;
 
     /**
      * Gets the first time when this rule takes effect after the specified time.
      * @param base              The first start time after this base time will be returned.
      * @param prevRawOffset     The standard time offset from UTC before this rule
      *                          takes effect in milliseconds.
      * @param prevDSTSavings    The amount of daylight saving offset from the
      *                          standard time.
      * @param inclusive         Whether the base time is inclusive or not.
      * @param result            Receives The first time when this rule takes effect after
      *                          the specified base time.
      * @return  true if the start time is available.  When false is returned, output parameter
      *          "result" is unchanged.
      * @stable ICU 3.8
      */
     virtual UBool getNextStart(UDate base, int32_t prevRawOffset, int32_t prevDSTSavings,
         UBool inclusive, UDate& result) const override;
 
     /**
      * Gets the most recent time when this rule takes effect before the specified time.
      * @param base              The most recent time before this base time will be returned.
      * @param prevRawOffset     The standard time offset from UTC before this rule
      *                          takes effect in milliseconds.
      * @param prevDSTSavings    The amount of daylight saving offset from the
      *                          standard time.
      * @param inclusive         Whether the base time is inclusive or not.
      * @param result            Receives The most recent time when this rule takes effect before
      *                          the specified base time.
      * @return  true if the start time is available.  When false is returned, output parameter
      *          "result" is unchanged.
      * @stable ICU 3.8
      */
     virtual UBool getPreviousStart(UDate base, int32_t prevRawOffset, int32_t prevDSTSavings,
         UBool inclusive, UDate& result) const override;
 
 public:
     /**
      * Return the class ID for this class. This is useful only for comparing to
      * a return value from getDynamicClassID(). For example:
      * <pre>
      * .   Base* polymorphic_pointer = createPolymorphicObject();
      * .   if (polymorphic_pointer->getDynamicClassID() ==
      * .       erived::getStaticClassID()) ...
      * </pre>
      * @return          The class ID for all objects of this class.
      * @stable ICU 3.8
      */
     static UClassID U_EXPORT2 getStaticClassID(void);
 
     /**
      * Returns a unique class ID POLYMORPHICALLY. Pure virtual override. This
      * method is to implement a simple version of RTTI, since not all C++
      * compilers support genuine RTTI. Polymorphic operator==() and clone()
      * methods call this method.
      *
      * @return          The class ID for this object. All objects of a
      *                  given class have the same class ID.  Objects of
      *                  other classes have different class IDs.
      * @stable ICU 3.8
      */
     virtual UClassID getDynamicClassID(void) const override;
 };
 
 /**
  * <code>AnnualTimeZoneRule</code> is a class used for representing a time zone
  * rule which takes effect annually.  The calendar system used for the rule is
  * is based on Gregorian calendar
  * 
  * @stable ICU 3.8
  */
 class U_I18N_API AnnualTimeZoneRule : public TimeZoneRule {
 public:
     /**
      * The constant representing the maximum year used for designating
      * a rule is permanent.
      */
     static const int32_t MAX_YEAR;
 
     /**
      * Constructs a <code>AnnualTimeZoneRule</code> with the name, the GMT offset of its
      * standard time, the amount of daylight saving offset adjustment, the annual start
      * time rule and the start/until years.  The input DateTimeRule is copied by this
      * constructor, so the caller remains responsible for deleting the object.
      * @param name          The time zone name.
      * @param rawOffset     The GMT offset of its standard time in milliseconds.
      * @param dstSavings    The amount of daylight saving offset adjustment in
      *                      milliseconds.  If this ia a rule for standard time,
      *                      the value of this argument is 0.
      * @param dateTimeRule  The start date/time rule repeated annually.
      * @param startYear     The first year when this rule takes effect.
      * @param endYear       The last year when this rule takes effect.  If this
      *                      rule is effective forever in future, specify MAX_YEAR.
      * @stable ICU 3.8
      */
     AnnualTimeZoneRule(const UnicodeString& name, int32_t rawOffset, int32_t dstSavings,
             const DateTimeRule& dateTimeRule, int32_t startYear, int32_t endYear);
 
     /**
      * Constructs a <code>AnnualTimeZoneRule</code> with the name, the GMT offset of its
      * standard time, the amount of daylight saving offset adjustment, the annual start
      * time rule and the start/until years.  The input DateTimeRule object is adopted
      * by this object, therefore, the caller must not delete the object.
      * @param name          The time zone name.
      * @param rawOffset     The GMT offset of its standard time in milliseconds.
      * @param dstSavings    The amount of daylight saving offset adjustment in
      *                      milliseconds.  If this ia a rule for standard time,
      *                      the value of this argument is 0.
      * @param dateTimeRule  The start date/time rule repeated annually.
      * @param startYear     The first year when this rule takes effect.
      * @param endYear       The last year when this rule takes effect.  If this
      *                      rule is effective forever in future, specify MAX_YEAR.
      * @stable ICU 3.8
      */
     AnnualTimeZoneRule(const UnicodeString& name, int32_t rawOffset, int32_t dstSavings,
             DateTimeRule* dateTimeRule, int32_t startYear, int32_t endYear);
 
     /**
      * Copy constructor.
      * @param source    The AnnualTimeZoneRule object to be copied.
      * @stable ICU 3.8
      */
     AnnualTimeZoneRule(const AnnualTimeZoneRule& source);
 
     /**
      * Destructor.
      * @stable ICU 3.8
      */
     virtual ~AnnualTimeZoneRule();
 
     /**
      * Clone this AnnualTimeZoneRule object polymorphically. The caller owns the result and
      * should delete it when done.
      * @return    A copy of the object.
      * @stable ICU 3.8
      */
     virtual AnnualTimeZoneRule* clone() const override;
 
     /**
      * Assignment operator.
      * @param right The object to be copied.
      * @stable ICU 3.8
      */
     AnnualTimeZoneRule& operator=(const AnnualTimeZoneRule& right);
 
     /**
      * Return true if the given <code>TimeZoneRule</code> objects are semantically equal. Objects
      * of different subclasses are considered unequal.
      * @param that  The object to be compared with.
      * @return  true if the given <code>TimeZoneRule</code> objects are semantically equal.
      * @stable ICU 3.8
      */
     virtual bool operator==(const TimeZoneRule& that) const override;
 
     /**
      * Return true if the given <code>TimeZoneRule</code> objects are semantically unequal. Objects
      * of different subclasses are considered unequal.
      * @param that  The object to be compared with.
      * @return  true if the given <code>TimeZoneRule</code> objects are semantically unequal.
      * @stable ICU 3.8
      */
     virtual bool operator!=(const TimeZoneRule& that) const override;
 
     /**
      * Gets the start date/time rule used by this rule.
      * @return  The <code>AnnualDateTimeRule</code> which represents the start date/time
      *          rule used by this time zone rule.
      * @stable ICU 3.8
      */
     const DateTimeRule* getRule(void) const;
 
     /**
      * Gets the first year when this rule takes effect.
      * @return  The start year of this rule.  The year is in Gregorian calendar
      *          with 0 == 1 BCE, -1 == 2 BCE, etc.
      * @stable ICU 3.8
      */
     int32_t getStartYear(void) const;
 
     /**
      * Gets the end year when this rule takes effect.
      * @return  The end year of this rule (inclusive). The year is in Gregorian calendar
      *          with 0 == 1 BCE, -1 == 2 BCE, etc.
      * @stable ICU 3.8
      */
     int32_t getEndYear(void) const;
 
     /**
      * Gets the time when this rule takes effect in the given year.
      * @param year              The Gregorian year, with 0 == 1 BCE, -1 == 2 BCE, etc.
      * @param prevRawOffset     The standard time offset from UTC before this rule
      *                          takes effect in milliseconds.
      * @param prevDSTSavings    The amount of daylight saving offset from the
      *                          standard time.
      * @param result            Receives the start time in the year.
      * @return  true if this rule takes effect in the year and the result is set to
      *          "result".
      * @stable ICU 3.8
      */
     UBool getStartInYear(int32_t year, int32_t prevRawOffset, int32_t prevDSTSavings, UDate& result) const;
 
     /**
      * Returns if this rule represents the same rule and offsets as another.
      * When two <code>TimeZoneRule</code> objects differ only its names, this method
      * returns true.
      * @param that  The <code>TimeZoneRule</code> object to be compared with.
      * @return  true if the other <code>TimeZoneRule</code> is equivalent to this one.
      * @stable ICU 3.8
      */
     virtual UBool isEquivalentTo(const TimeZoneRule& that) const override;
 
     /**
      * Gets the very first time when this rule takes effect.
      * @param prevRawOffset     The standard time offset from UTC before this rule
      *                          takes effect in milliseconds.
      * @param prevDSTSavings    The amount of daylight saving offset from the
      *                          standard time.
      * @param result            Receives the very first time when this rule takes effect.
      * @return  true if the start time is available.  When false is returned, output parameter
      *          "result" is unchanged.
      * @stable ICU 3.8
      */
     virtual UBool getFirstStart(int32_t prevRawOffset, int32_t prevDSTSavings, UDate& result) const override;
 
     /**
      * Gets the final time when this rule takes effect.
      * @param prevRawOffset     The standard time offset from UTC before this rule
      *                          takes effect in milliseconds.
      * @param prevDSTSavings    The amount of daylight saving offset from the
      *                          standard time.
      * @param result            Receives the final time when this rule takes effect.
      * @return  true if the start time is available.  When false is returned, output parameter
      *          "result" is unchanged.
      * @stable ICU 3.8
      */
     virtual UBool getFinalStart(int32_t prevRawOffset, int32_t prevDSTSavings, UDate& result) const override;
 
     /**
      * Gets the first time when this rule takes effect after the specified time.
      * @param base              The first start time after this base time will be returned.
      * @param prevRawOffset     The standard time offset from UTC before this rule
      *                          takes effect in milliseconds.
      * @param prevDSTSavings    The amount of daylight saving offset from the
      *                          standard time.
      * @param inclusive         Whether the base time is inclusive or not.
      * @param result            Receives The first time when this rule takes effect after
      *                          the specified base time.
      * @return  true if the start time is available.  When false is returned, output parameter
      *          "result" is unchanged.
      * @stable ICU 3.8
      */
     virtual UBool getNextStart(UDate base, int32_t prevRawOffset, int32_t prevDSTSavings,
         UBool inclusive, UDate& result) const override;
 
     /**
      * Gets the most recent time when this rule takes effect before the specified time.
      * @param base              The most recent time before this base time will be returned.
      * @param prevRawOffset     The standard time offset from UTC before this rule
      *                          takes effect in milliseconds.
      * @param prevDSTSavings    The amount of daylight saving offset from the
      *                          standard time.
      * @param inclusive         Whether the base time is inclusive or not.
      * @param result            Receives The most recent time when this rule takes effect before
      *                          the specified base time.
      * @return  true if the start time is available.  When false is returned, output parameter
      *          "result" is unchanged.
      * @stable ICU 3.8
      */
     virtual UBool getPreviousStart(UDate base, int32_t prevRawOffset, int32_t prevDSTSavings,
         UBool inclusive, UDate& result) const override;
 
 
 private:
     DateTimeRule* fDateTimeRule;
     int32_t fStartYear;
     int32_t fEndYear;
 
 public:
     /**
      * Return the class ID for this class. This is useful only for comparing to
      * a return value from getDynamicClassID(). For example:
      * <pre>
      * .   Base* polymorphic_pointer = createPolymorphicObject();
      * .   if (polymorphic_pointer->getDynamicClassID() ==
      * .       erived::getStaticClassID()) ...
      * </pre>
      * @return          The class ID for all objects of this class.
      * @stable ICU 3.8
      */
     static UClassID U_EXPORT2 getStaticClassID(void);
 
     /**
      * Returns a unique class ID POLYMORPHICALLY. Pure virtual override. This
      * method is to implement a simple version of RTTI, since not all C++
      * compilers support genuine RTTI. Polymorphic operator==() and clone()
      * methods call this method.
      *
      * @return          The class ID for this object. All objects of a
      *                  given class have the same class ID.  Objects of
      *                  other classes have different class IDs.
      * @stable ICU 3.8
      */
     virtual UClassID getDynamicClassID(void) const override;
 };
 
 /**
  * <code>TimeArrayTimeZoneRule</code> represents a time zone rule whose start times are
  * defined by an array of milliseconds since the standard base time.
  * 
  * @stable ICU 3.8
  */
 class U_I18N_API TimeArrayTimeZoneRule : public TimeZoneRule {
 public:
     /**
      * Constructs a <code>TimeArrayTimeZoneRule</code> with the name, the GMT offset of its
      * standard time, the amount of daylight saving offset adjustment and
      * the array of times when this rule takes effect.
      * @param name          The time zone name.
      * @param rawOffset     The UTC offset of its standard time in milliseconds.
      * @param dstSavings    The amount of daylight saving offset adjustment in
      *                      milliseconds.  If this ia a rule for standard time,
      *                      the value of this argument is 0.
      * @param startTimes    The array start times in milliseconds since the base time
      *                      (January 1, 1970, 00:00:00).
      * @param numStartTimes The number of elements in the parameter "startTimes"
      * @param timeRuleType  The time type of the start times, which is one of
      *                      <code>DataTimeRule::WALL_TIME</code>, <code>STANDARD_TIME</code>
      *                      and <code>UTC_TIME</code>.
      * @stable ICU 3.8
      */
     TimeArrayTimeZoneRule(const UnicodeString& name, int32_t rawOffset, int32_t dstSavings,
         const UDate* startTimes, int32_t numStartTimes, DateTimeRule::TimeRuleType timeRuleType);
 
     /**
      * Copy constructor.
      * @param source    The TimeArrayTimeZoneRule object to be copied.
      * @stable ICU 3.8
      */
     TimeArrayTimeZoneRule(const TimeArrayTimeZoneRule& source);
 
     /**
      * Destructor.
      * @stable ICU 3.8
      */
     virtual ~TimeArrayTimeZoneRule();
 
     /**
      * Clone this TimeArrayTimeZoneRule object polymorphically. The caller owns the result and
      * should delete it when done.
      * @return    A copy of the object.
      * @stable ICU 3.8
      */
     virtual TimeArrayTimeZoneRule* clone() const override;
 
     /**
      * Assignment operator.
      * @param right The object to be copied.
      * @stable ICU 3.8
      */
     TimeArrayTimeZoneRule& operator=(const TimeArrayTimeZoneRule& right);
 
     /**
      * Return true if the given <code>TimeZoneRule</code> objects are semantically equal. Objects
      * of different subclasses are considered unequal.
      * @param that  The object to be compared with.
      * @return  true if the given <code>TimeZoneRule</code> objects are semantically equal.
      * @stable ICU 3.8
      */
     virtual bool operator==(const TimeZoneRule& that) const override;
 
     /**
      * Return true if the given <code>TimeZoneRule</code> objects are semantically unequal. Objects
      * of different subclasses are considered unequal.
      * @param that  The object to be compared with.
      * @return  true if the given <code>TimeZoneRule</code> objects are semantically unequal.
      * @stable ICU 3.8
      */
     virtual bool operator!=(const TimeZoneRule& that) const override;
 
     /**
      * Gets the time type of the start times used by this rule.  The return value
      * is either <code>DateTimeRule::WALL_TIME</code> or <code>STANDARD_TIME</code>
      * or <code>UTC_TIME</code>.
      * 
      * @return The time type used of the start times used by this rule.
      * @stable ICU 3.8
      */
     DateTimeRule::TimeRuleType getTimeType(void) const;
 
     /**
      * Gets a start time at the index stored in this rule.
      * @param index     The index of start times
      * @param result    Receives the start time at the index
      * @return  true if the index is within the valid range and
      *          and the result is set.  When false, the output
      *          parameger "result" is unchanged.
      * @stable ICU 3.8
      */
     UBool getStartTimeAt(int32_t index, UDate& result) const;
 
     /**
      * Returns the number of start times stored in this rule
      * @return The number of start times.
      * @stable ICU 3.8
      */
     int32_t countStartTimes(void) const;
 
     /**
      * Returns if this rule represents the same rule and offsets as another.
      * When two <code>TimeZoneRule</code> objects differ only its names, this method
      * returns true.
      * @param that  The <code>TimeZoneRule</code> object to be compared with.
      * @return  true if the other <code>TimeZoneRule</code> is equivalent to this one.
      * @stable ICU 3.8
      */
     virtual UBool isEquivalentTo(const TimeZoneRule& that) const override;
 
     /**
      * Gets the very first time when this rule takes effect.
      * @param prevRawOffset     The standard time offset from UTC before this rule
      *                          takes effect in milliseconds.
      * @param prevDSTSavings    The amount of daylight saving offset from the
      *                          standard time.
      * @param result            Receives the very first time when this rule takes effect.
      * @return  true if the start time is available.  When false is returned, output parameter
      *          "result" is unchanged.
      * @stable ICU 3.8
      */
     virtual UBool getFirstStart(int32_t prevRawOffset, int32_t prevDSTSavings, UDate& result) const override;
 
     /**
      * Gets the final time when this rule takes effect.
      * @param prevRawOffset     The standard time offset from UTC before this rule
      *                          takes effect in milliseconds.
      * @param prevDSTSavings    The amount of daylight saving offset from the
      *                          standard time.
      * @param result            Receives the final time when this rule takes effect.
      * @return  true if the start time is available.  When false is returned, output parameter
      *          "result" is unchanged.
      * @stable ICU 3.8
      */
     virtual UBool getFinalStart(int32_t prevRawOffset, int32_t prevDSTSavings, UDate& result) const override;
 
     /**
      * Gets the first time when this rule takes effect after the specified time.
      * @param base              The first start time after this base time will be returned.
      * @param prevRawOffset     The standard time offset from UTC before this rule
      *                          takes effect in milliseconds.
      * @param prevDSTSavings    The amount of daylight saving offset from the
      *                          standard time.
      * @param inclusive         Whether the base time is inclusive or not.
      * @param result            Receives The first time when this rule takes effect after
      *                          the specified base time.
      * @return  true if the start time is available.  When false is returned, output parameter
      *          "result" is unchanged.
      * @stable ICU 3.8
      */
     virtual UBool getNextStart(UDate base, int32_t prevRawOffset, int32_t prevDSTSavings,
         UBool inclusive, UDate& result) const override;
 
     /**
      * Gets the most recent time when this rule takes effect before the specified time.
      * @param base              The most recent time before this base time will be returned.
      * @param prevRawOffset     The standard time offset from UTC before this rule
      *                          takes effect in milliseconds.
      * @param prevDSTSavings    The amount of daylight saving offset from the
      *                          standard time.
      * @param inclusive         Whether the base time is inclusive or not.
      * @param result            Receives The most recent time when this rule takes effect before
      *                          the specified base time.
      * @return  true if the start time is available.  When false is returned, output parameter
      *          "result" is unchanged.
      * @stable ICU 3.8
      */
     virtual UBool getPreviousStart(UDate base, int32_t prevRawOffset, int32_t prevDSTSavings,
         UBool inclusive, UDate& result) const override;
 
 
 private:
     enum { TIMEARRAY_STACK_BUFFER_SIZE = 32 };
     UBool initStartTimes(const UDate source[], int32_t size, UErrorCode& ec);
     UDate getUTC(UDate time, int32_t raw, int32_t dst) const;
 
     DateTimeRule::TimeRuleType  fTimeRuleType;
     int32_t fNumStartTimes;
     UDate*  fStartTimes;
     UDate   fLocalStartTimes[TIMEARRAY_STACK_BUFFER_SIZE];
 
 public:
     /**
      * Return the class ID for this class. This is useful only for comparing to
      * a return value from getDynamicClassID(). For example:
      * <pre>
      * .   Base* polymorphic_pointer = createPolymorphicObject();
      * .   if (polymorphic_pointer->getDynamicClassID() ==
      * .       erived::getStaticClassID()) ...
      * </pre>
      * @return          The class ID for all objects of this class.
      * @stable ICU 3.8
      */
     static UClassID U_EXPORT2 getStaticClassID(void);
 
     /**
      * Returns a unique class ID POLYMORPHICALLY. Pure virtual override. This
      * method is to implement a simple version of RTTI, since not all C++
      * compilers support genuine RTTI. Polymorphic operator==() and clone()
      * methods call this method.
      *
      * @return          The class ID for this object. All objects of a
      *                  given class have the same class ID.  Objects of
      *                  other classes have different class IDs.
      * @stable ICU 3.8
      */
     virtual UClassID getDynamicClassID(void) const override;
 };
 
 
 U_NAMESPACE_END
 
 #endif /* #if !UCONFIG_NO_FORMATTING */
 
 #endif /* U_SHOW_CPLUSPLUS_API */
 
 #endif // TZRULE_H
 
 //eof

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