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ðŸ“„ alphaindex.h(26.48 KB)
ðŸ“„ appendable.h(8.49 KB)
ðŸ“„ basictz.h(9.15 KB)
ðŸ“„ brkiter.h(27.8 KB)
ðŸ“„ bytestream.h(9.6 KB)
ðŸ“„ bytestrie.h(20.77 KB)
ðŸ“„ bytestriebuilder.h(7.08 KB)
ðŸ“„ calendar.h(105.74 KB)
ðŸ“„ caniter.h(7.43 KB)
ðŸ“„ casemap.h(25.33 KB)
ðŸ“„ char16ptr.h(7.22 KB)
ðŸ“„ chariter.h(24.05 KB)
ðŸ“„ choicfmt.h(23.91 KB)
ðŸ“„ coleitr.h(13.76 KB)
ðŸ“„ coll.h(56.23 KB)
ðŸ“„ compactdecimalformat.h(6.88 KB)
ðŸ“„ curramt.h(3.76 KB)
ðŸ“„ currpinf.h(7.3 KB)
ðŸ“„ currunit.h(4.05 KB)
ðŸ“„ datefmt.h(40.67 KB)
ðŸ“„ dbbi.h(1.19 KB)
ðŸ“„ dcfmtsym.h(20.13 KB)
ðŸ“„ decimfmt.h(87.38 KB)
ðŸ“„ docmain.h(6.97 KB)
ðŸ“„ dtfmtsym.h(37.7 KB)
ðŸ“„ dtintrv.h(3.84 KB)
ðŸ“„ dtitvfmt.h(46.63 KB)
ðŸ“„ dtitvinf.h(18.51 KB)
ðŸ“„ dtptngen.h(25.08 KB)
ðŸ“„ dtrule.h(8.68 KB)
ðŸ“„ edits.h(20.74 KB)
ðŸ“„ enumset.h(2.08 KB)
ðŸ“„ errorcode.h(4.84 KB)
ðŸ“„ fieldpos.h(8.69 KB)
ðŸ“„ filteredbrk.h(5.37 KB)
ðŸ“„ fmtable.h(24.42 KB)
ðŸ“„ format.h(12.5 KB)
ðŸ“„ formattedvalue.h(10.27 KB)
ðŸ“„ fpositer.h(3.04 KB)
ðŸ“„ gender.h(3.33 KB)
ðŸ“„ gregocal.h(31.71 KB)
ðŸ“„ icudataver.h(1.03 KB)
ðŸ“„ icuplug.h(11.88 KB)
ðŸ“„ idna.h(12.7 KB)
ðŸ“„ listformatter.h(9.47 KB)
ðŸ“„ localebuilder.h(11.27 KB)
ðŸ“„ localematcher.h(22.5 KB)
ðŸ“„ localpointer.h(19.69 KB)
ðŸ“„ locdspnm.h(7.12 KB)
ðŸ“„ locid.h(47.4 KB)
ðŸ“„ measfmt.h(11.33 KB)
ðŸ“„ measunit.h(93.31 KB)
ðŸ“„ measure.h(4.32 KB)
ðŸ“„ messagepattern.h(33.71 KB)
ðŸ“„ msgfmt.h(44.11 KB)
ðŸ“„ normalizer2.h(34.03 KB)
ðŸ“„ normlzr.h(30.94 KB)
ðŸ“„ nounit.h(2.69 KB)
ðŸ“„ numberformatter.h(86.31 KB)
ðŸ“„ numberrangeformatter.h(30.14 KB)
ðŸ“„ numfmt.h(49.81 KB)
ðŸ“„ numsys.h(7.19 KB)
ðŸ“„ parseerr.h(3.08 KB)
ðŸ“„ parsepos.h(5.56 KB)
ðŸ“„ platform.h(28.08 KB)
ðŸ“„ plurfmt.h(25.2 KB)
ðŸ“„ plurrule.h(18.39 KB)
ðŸ“„ ptypes.h(3.49 KB)
ðŸ“„ putil.h(6.33 KB)
ðŸ“„ rbbi.h(26.58 KB)
ðŸ“„ rbnf.h(48.73 KB)
ðŸ“„ rbtz.h(15.6 KB)
ðŸ“„ regex.h(84.36 KB)
ðŸ“„ region.h(9.18 KB)
ðŸ“„ reldatefmt.h(22.62 KB)
ðŸ“„ rep.h(9.37 KB)
ðŸ“„ resbund.h(18.07 KB)
ðŸ“„ schriter.h(6.32 KB)
ðŸ“„ scientificnumberformatter.h(6.4 KB)
ðŸ“„ search.h(22.22 KB)
ðŸ“„ selfmt.h(14.3 KB)
ðŸ“„ simpleformatter.h(12.59 KB)
ðŸ“„ simpletz.h(45.44 KB)
ðŸ“„ smpdtfmt.h(70.97 KB)
ðŸ“„ sortkey.h(11.18 KB)
ðŸ“„ std_string.h(1.05 KB)
ðŸ“„ strenum.h(9.92 KB)
ðŸ“„ stringoptions.h(5.79 KB)
ðŸ“„ stringpiece.h(7.38 KB)
ðŸ“„ stringtriebuilder.h(15.33 KB)
ðŸ“„ stsearch.h(21.3 KB)
ðŸ“„ symtable.h(4.27 KB)
ðŸ“„ tblcoll.h(36.61 KB)
ðŸ“„ timezone.h(41.02 KB)
ðŸ“„ tmunit.h(3.38 KB)
ðŸ“„ tmutamt.h(4.9 KB)
ðŸ“„ tmutfmt.h(7.85 KB)
ðŸ“„ translit.h(65.82 KB)
ðŸ“„ tzfmt.h(42.89 KB)
ðŸ“„ tznames.h(16.85 KB)
ðŸ“„ tzrule.h(35.37 KB)
ðŸ“„ tztrans.h(6.12 KB)
ðŸ“„ ubidi.h(89.56 KB)
ðŸ“„ ubiditransform.h(12.65 KB)
ðŸ“„ ubrk.h(23.97 KB)
ðŸ“„ ucal.h(56.9 KB)
ðŸ“„ ucasemap.h(15.18 KB)
ðŸ“„ ucat.h(5.36 KB)
ðŸ“„ uchar.h(140.56 KB)
ðŸ“„ ucharstrie.h(22.58 KB)
ðŸ“„ ucharstriebuilder.h(7.21 KB)
ðŸ“„ uchriter.h(13.2 KB)
ðŸ“„ uclean.h(11.21 KB)
ðŸ“„ ucnv.h(83.09 KB)
ðŸ“„ ucnv_cb.h(6.59 KB)
ðŸ“„ ucnv_err.h(20.99 KB)
ðŸ“„ ucnvsel.h(6.14 KB)
ðŸ“„ ucol.h(61.46 KB)
ðŸ“„ ucoleitr.h(9.46 KB)
ðŸ“„ uconfig.h(12.07 KB)
ðŸ“„ ucpmap.h(5.53 KB)
ðŸ“„ ucptrie.h(22.46 KB)
ðŸ“„ ucsdet.h(14.67 KB)
ðŸ“„ ucurr.h(16.12 KB)
ðŸ“„ udat.h(60.88 KB)
ðŸ“„ udata.h(15.56 KB)
ðŸ“„ udateintervalformat.h(10.03 KB)
ðŸ“„ udatpg.h(26.01 KB)
ðŸ“„ udisplaycontext.h(5.89 KB)
ðŸ“„ uenum.h(7.78 KB)
ðŸ“„ ufieldpositer.h(4.36 KB)
ðŸ“„ uformattable.h(10.94 KB)
ðŸ“„ uformattedvalue.h(12.14 KB)
ðŸ“„ ugender.h(2 KB)
ðŸ“„ uidna.h(33.37 KB)
ðŸ“„ uiter.h(22.77 KB)
ðŸ“„ uldnames.h(10.45 KB)
ðŸ“„ ulistformatter.h(8.83 KB)
ðŸ“„ uloc.h(52.54 KB)
ðŸ“„ ulocdata.h(11.26 KB)
ðŸ“„ umachine.h(14.53 KB)
ðŸ“„ umisc.h(1.33 KB)
ðŸ“„ umsg.h(24.23 KB)
ðŸ“„ umutablecptrie.h(8.24 KB)
ðŸ“„ unifilt.h(3.96 KB)
ðŸ“„ unifunct.h(4.04 KB)
ðŸ“„ unimatch.h(6.1 KB)
ðŸ“„ unirepl.h(3.38 KB)
ðŸ“„ uniset.h(64.9 KB)
ðŸ“„ unistr.h(170.43 KB)
ðŸ“„ unorm.h(20.52 KB)
ðŸ“„ unorm2.h(24.66 KB)
ðŸ“„ unum.h(53.62 KB)
ðŸ“„ unumberformatter.h(25.36 KB)
ðŸ“„ unumsys.h(7.21 KB)
ðŸ“„ uobject.h(10.68 KB)
ðŸ“„ upluralrules.h(7.88 KB)
ðŸ“„ uregex.h(72.05 KB)
ðŸ“„ uregion.h(9.84 KB)
ðŸ“„ ureldatefmt.h(17.26 KB)
ðŸ“„ urename.h(130.97 KB)
ðŸ“„ urep.h(5.38 KB)
ðŸ“„ ures.h(36.54 KB)
ðŸ“„ uscript.h(26.87 KB)
ðŸ“„ usearch.h(38.12 KB)
ðŸ“„ uset.h(40 KB)
ðŸ“„ usetiter.h(9.55 KB)
ðŸ“„ ushape.h(18 KB)
ðŸ“„ uspoof.h(65.9 KB)
ðŸ“„ usprep.h(8.14 KB)
ðŸ“„ ustdio.h(38.54 KB)
ðŸ“„ ustream.h(1.89 KB)
ðŸ“„ ustring.h(72.47 KB)
ðŸ“„ ustringtrie.h(3.15 KB)
ðŸ“„ utext.h(58.13 KB)
ðŸ“„ utf.h(7.86 KB)
ðŸ“„ utf16.h(23.32 KB)
ðŸ“„ utf32.h(763 B)
ðŸ“„ utf8.h(30.96 KB)
ðŸ“„ utf_old.h(45.83 KB)
ðŸ“„ utmscale.h(13.78 KB)
ðŸ“„ utrace.h(15.73 KB)
ðŸ“„ utrans.h(25.52 KB)
ðŸ“„ utypes.h(30.74 KB)
ðŸ“„ uvernum.h(6.67 KB)
ðŸ“„ uversion.h(6 KB)
ðŸ“„ vtzone.h(20.3 KB)

Editing: reldatefmt.h

// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*****************************************************************************
* Copyright (C) 2014-2016, International Business Machines Corporation and
* others.
* All Rights Reserved.
*****************************************************************************
*
* File RELDATEFMT.H
*****************************************************************************
*/

#ifndef __RELDATEFMT_H
#define __RELDATEFMT_H

#include "unicode/utypes.h"

#if U_SHOW_CPLUSPLUS_API

#include "unicode/uobject.h"
#include "unicode/udisplaycontext.h"
#include "unicode/ureldatefmt.h"
#include "unicode/locid.h"
#include "unicode/formattedvalue.h"

/**
 * \file
 * \brief C++ API: Formats relative dates such as "1 day ago" or "tomorrow"
 */

#if !UCONFIG_NO_FORMATTING

/**
 * Represents the unit for formatting a relative date. e.g "in 5 days"
 * or "in 3 months"
 * @stable ICU 53
 */
typedef enum UDateRelativeUnit {

/**
     * Seconds
     * @stable ICU 53
     */
    UDAT_RELATIVE_SECONDS,

/**
     * Minutes
     * @stable ICU 53
     */
    UDAT_RELATIVE_MINUTES,

/**
     * Hours
     * @stable ICU 53
     */
    UDAT_RELATIVE_HOURS,

/**
     * Days
     * @stable ICU 53
     */
    UDAT_RELATIVE_DAYS,

/**
     * Weeks
     * @stable ICU 53
     */
    UDAT_RELATIVE_WEEKS,

/**
     * Months
     * @stable ICU 53
     */
    UDAT_RELATIVE_MONTHS,

/**
     * Years
     * @stable ICU 53
     */
    UDAT_RELATIVE_YEARS,

#ifndef U_HIDE_DEPRECATED_API
    /**
     * One more than the highest normal UDateRelativeUnit value.
     * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
     */
    UDAT_RELATIVE_UNIT_COUNT
#endif  // U_HIDE_DEPRECATED_API
} UDateRelativeUnit;

/**
 * Represents an absolute unit.
 * @stable ICU 53
 */
typedef enum UDateAbsoluteUnit {

// Days of week have to remain together and in order from Sunday to
    // Saturday.
    /**
     * Sunday
     * @stable ICU 53
     */
    UDAT_ABSOLUTE_SUNDAY,

/**
     * Monday
     * @stable ICU 53
     */
    UDAT_ABSOLUTE_MONDAY,

/**
     * Tuesday
     * @stable ICU 53
     */
    UDAT_ABSOLUTE_TUESDAY,

/**
     * Wednesday
     * @stable ICU 53
     */
    UDAT_ABSOLUTE_WEDNESDAY,

/**
     * Thursday
     * @stable ICU 53
     */
    UDAT_ABSOLUTE_THURSDAY,

/**
     * Friday
     * @stable ICU 53
     */
    UDAT_ABSOLUTE_FRIDAY,

/**
     * Saturday
     * @stable ICU 53
     */
    UDAT_ABSOLUTE_SATURDAY,

/**
     * Day
     * @stable ICU 53
     */
    UDAT_ABSOLUTE_DAY,

/**
     * Week
     * @stable ICU 53
     */
    UDAT_ABSOLUTE_WEEK,

/**
     * Month
     * @stable ICU 53
     */
    UDAT_ABSOLUTE_MONTH,

/**
     * Year
     * @stable ICU 53
     */
    UDAT_ABSOLUTE_YEAR,

/**
     * Now
     * @stable ICU 53
     */
    UDAT_ABSOLUTE_NOW,

/**
     * Quarter
     * @stable ICU 63
     */
    UDAT_ABSOLUTE_QUARTER,

#ifndef U_HIDE_DRAFT_API
    /**
     * Hour
     * @draft ICU 65
     */
    UDAT_ABSOLUTE_HOUR,

/**
     * Minute
     * @draft ICU 65
     */
    UDAT_ABSOLUTE_MINUTE,
#endif // U_HIDE_DRAFT_API

#ifndef U_HIDE_DEPRECATED_API
    /**
     * One more than the highest normal UDateAbsoluteUnit value.
     * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
     */
    UDAT_ABSOLUTE_UNIT_COUNT = UDAT_ABSOLUTE_NOW + 4
#endif  // U_HIDE_DEPRECATED_API
} UDateAbsoluteUnit;

/**
 * Represents a direction for an absolute unit e.g "Next Tuesday"
 * or "Last Tuesday"
 * @stable ICU 53
 */
typedef enum UDateDirection {

/**
     * Two before. Not fully supported in every locale.
     * @stable ICU 53
     */
    UDAT_DIRECTION_LAST_2,

/**
     * Last
     * @stable ICU 53
     */
    UDAT_DIRECTION_LAST,

/**
     * This
     * @stable ICU 53
     */
    UDAT_DIRECTION_THIS,

/**
     * Next
     * @stable ICU 53
     */
    UDAT_DIRECTION_NEXT,

/**
     * Two after. Not fully supported in every locale.
     * @stable ICU 53
     */
    UDAT_DIRECTION_NEXT_2,

/**
     * Plain, which means the absence of a qualifier.
     * @stable ICU 53
     */
    UDAT_DIRECTION_PLAIN,

#ifndef U_HIDE_DEPRECATED_API
    /**
     * One more than the highest normal UDateDirection value.
     * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
     */
    UDAT_DIRECTION_COUNT
#endif  // U_HIDE_DEPRECATED_API
} UDateDirection;

#if !UCONFIG_NO_BREAK_ITERATION

U_NAMESPACE_BEGIN

class BreakIterator;
class RelativeDateTimeCacheData;
class SharedNumberFormat;
class SharedPluralRules;
class SharedBreakIterator;
class NumberFormat;
class UnicodeString;
class FormattedRelativeDateTime;
class FormattedRelativeDateTimeData;

#ifndef U_HIDE_DRAFT_API
/**
 * An immutable class containing the result of a relative datetime formatting operation.
 *
 * Instances of this class are immutable and thread-safe.
 *
 * Not intended for public subclassing.
 *
 * @draft ICU 64
 */
class U_I18N_API FormattedRelativeDateTime : public UMemory, public FormattedValue {
  public:
    /**
     * Default constructor; makes an empty FormattedRelativeDateTime.
     * @draft ICU 64
     */
    FormattedRelativeDateTime() : fData(nullptr), fErrorCode(U_INVALID_STATE_ERROR) {}

/**
     * Move constructor: Leaves the source FormattedRelativeDateTime in an undefined state.
     * @draft ICU 64
     */
    FormattedRelativeDateTime(FormattedRelativeDateTime&& src) U_NOEXCEPT;

/**
     * Destruct an instance of FormattedRelativeDateTime.
     * @draft ICU 64
     */
    virtual ~FormattedRelativeDateTime() U_OVERRIDE;

/** Copying not supported; use move constructor instead. */
    FormattedRelativeDateTime(const FormattedRelativeDateTime&) = delete;

/** Copying not supported; use move assignment instead. */
    FormattedRelativeDateTime& operator=(const FormattedRelativeDateTime&) = delete;

/**
     * Move assignment: Leaves the source FormattedRelativeDateTime in an undefined state.
     * @draft ICU 64
     */
    FormattedRelativeDateTime& operator=(FormattedRelativeDateTime&& src) U_NOEXCEPT;

/** @copydoc FormattedValue::toString() */
    UnicodeString toString(UErrorCode& status) const U_OVERRIDE;

/** @copydoc FormattedValue::toTempString() */
    UnicodeString toTempString(UErrorCode& status) const U_OVERRIDE;

/** @copydoc FormattedValue::appendTo() */
    Appendable &appendTo(Appendable& appendable, UErrorCode& status) const U_OVERRIDE;

/** @copydoc FormattedValue::nextPosition() */
    UBool nextPosition(ConstrainedFieldPosition& cfpos, UErrorCode& status) const U_OVERRIDE;

private:
    FormattedRelativeDateTimeData *fData;
    UErrorCode fErrorCode;
    explicit FormattedRelativeDateTime(FormattedRelativeDateTimeData *results)
        : fData(results), fErrorCode(U_ZERO_ERROR) {}
    explicit FormattedRelativeDateTime(UErrorCode errorCode)
        : fData(nullptr), fErrorCode(errorCode) {}
    friend class RelativeDateTimeFormatter;
};
#endif  /* U_HIDE_DRAFT_API */

/**
 * Formats simple relative dates. There are two types of relative dates that
 * it handles:
 * <ul>
 * <li>relative dates with a quantity e.g "in 5 days"</li>
 * <li>relative dates without a quantity e.g "next Tuesday"</li>
 * </ul>
 * 
 * This API is very basic and is intended to be a building block for more
 * fancy APIs. The caller tells it exactly what to display in a locale
 * independent way. While this class automatically provides the correct plural
 * forms, the grammatical form is otherwise as neutral as possible. It is the
 * caller's responsibility to handle cut-off logic such as deciding between
 * displaying "in 7 days" or "in 1 week." This API supports relative dates
 * involving one single unit. This API does not support relative dates
 * involving compound units,
 * e.g "in 5 days and 4 hours" nor does it support parsing.
 * 
 * This class is mostly thread safe and immutable with the following caveats:
 * 1. The assignment operator violates Immutability. It must not be used
 * concurrently with other operations.
 * 2. Caller must not hold onto adopted pointers.
 * 
 * This class is not intended for public subclassing.
 * 
 * Here are some examples of use:
 * <blockquote>
 * <pre>
 * UErrorCode status = U_ZERO_ERROR;
 * UnicodeString appendTo;
 * RelativeDateTimeFormatter fmt(status);
 * // Appends "in 1 day"
 * fmt.format(
 * 1, UDAT_DIRECTION_NEXT, UDAT_RELATIVE_DAYS, appendTo, status);
 * // Appends "in 3 days"
 * fmt.format(
 * 3, UDAT_DIRECTION_NEXT, UDAT_RELATIVE_DAYS, appendTo, status);
 * // Appends "3.2 years ago"
 * fmt.format(
 * 3.2, UDAT_DIRECTION_LAST, UDAT_RELATIVE_YEARS, appendTo, status);
 * // Appends "last Sunday"
 * fmt.format(UDAT_DIRECTION_LAST, UDAT_ABSOLUTE_SUNDAY, appendTo, status);
 * // Appends "this Sunday"
 * fmt.format(UDAT_DIRECTION_THIS, UDAT_ABSOLUTE_SUNDAY, appendTo, status);
 * // Appends "next Sunday"
 * fmt.format(UDAT_DIRECTION_NEXT, UDAT_ABSOLUTE_SUNDAY, appendTo, status);
 * // Appends "Sunday"
 * fmt.format(UDAT_DIRECTION_PLAIN, UDAT_ABSOLUTE_SUNDAY, appendTo, status);
 *
 * // Appends "yesterday"
 * fmt.format(UDAT_DIRECTION_LAST, UDAT_ABSOLUTE_DAY, appendTo, status);
 * // Appends "today"
 * fmt.format(UDAT_DIRECTION_THIS, UDAT_ABSOLUTE_DAY, appendTo, status);
 * // Appends "tomorrow"
 * fmt.format(UDAT_DIRECTION_NEXT, UDAT_ABSOLUTE_DAY, appendTo, status);
 * // Appends "now"
 * fmt.format(UDAT_DIRECTION_PLAIN, UDAT_ABSOLUTE_NOW, appendTo, status);
 *
 * </pre>
 * </blockquote>
 * 
 * In the future, we may add more forms, such as abbreviated/short forms
 * (3 secs ago), and relative day periods ("yesterday afternoon"), etc.
 *
 * The RelativeDateTimeFormatter class is not intended for public subclassing.
 *
 * @stable ICU 53
 */
class U_I18N_API RelativeDateTimeFormatter : public UObject {
public:

/**
     * Create RelativeDateTimeFormatter with default locale.
     * @stable ICU 53
     */
    RelativeDateTimeFormatter(UErrorCode& status);

/**
     * Create RelativeDateTimeFormatter with given locale.
     * @stable ICU 53
     */
    RelativeDateTimeFormatter(const Locale& locale, UErrorCode& status);

/**
     * Create RelativeDateTimeFormatter with given locale and NumberFormat.
     *
     * @param locale the locale
     * @param nfToAdopt Constructed object takes ownership of this pointer.
     *   It is an error for caller to delete this pointer or change its
     *   contents after calling this constructor.
     * @param status Any error is returned here.
     * @stable ICU 53
     */
    RelativeDateTimeFormatter(
        const Locale& locale, NumberFormat *nfToAdopt, UErrorCode& status);

/**
     * Create RelativeDateTimeFormatter with given locale, NumberFormat,
     * and capitalization context.
     *
     * @param locale the locale
     * @param nfToAdopt Constructed object takes ownership of this pointer.
     *   It is an error for caller to delete this pointer or change its
     *   contents after calling this constructor. Caller may pass NULL for
     *   this argument if they want default number format behavior.
     * @param style the format style. The UDAT_RELATIVE bit field has no effect.
     * @param capitalizationContext A value from UDisplayContext that pertains to
     * capitalization.
     * @param status Any error is returned here.
     * @stable ICU 54
     */
    RelativeDateTimeFormatter(
            const Locale& locale,
            NumberFormat *nfToAdopt,
            UDateRelativeDateTimeFormatterStyle style,
            UDisplayContext capitalizationContext,
            UErrorCode& status);

/**
     * Copy constructor.
     * @stable ICU 53
     */
    RelativeDateTimeFormatter(const RelativeDateTimeFormatter& other);

/**
     * Assignment operator.
     * @stable ICU 53
     */
    RelativeDateTimeFormatter& operator=(
            const RelativeDateTimeFormatter& other);

/**
     * Destructor.
     * @stable ICU 53
     */
    virtual ~RelativeDateTimeFormatter();

/**
     * Formats a relative date with a quantity such as "in 5 days" or
     * "3 months ago"
     *
     * This method returns a String. To get more information about the
     * formatting result, use formatToValue().
     *
     * @param quantity The numerical amount e.g 5. This value is formatted
     * according to this object's NumberFormat object.
     * @param direction NEXT means a future relative date; LAST means a past
     * relative date. If direction is anything else, this method sets
     * status to U_ILLEGAL_ARGUMENT_ERROR.
     * @param unit the unit e.g day? month? year?
     * @param appendTo The string to which the formatted result will be
     *  appended
     * @param status ICU error code returned here.
     * @return appendTo
     * @stable ICU 53
     */
    UnicodeString& format(
            double quantity,
            UDateDirection direction,
            UDateRelativeUnit unit,
            UnicodeString& appendTo,
            UErrorCode& status) const;

#ifndef U_HIDE_DRAFT_API
    /**
     * Formats a relative date with a quantity such as "in 5 days" or
     * "3 months ago"
     *
     * This method returns a FormattedRelativeDateTime, which exposes more
     * information than the String returned by format().
     *
     * @param quantity The numerical amount e.g 5. This value is formatted
     * according to this object's NumberFormat object.
     * @param direction NEXT means a future relative date; LAST means a past
     * relative date. If direction is anything else, this method sets
     * status to U_ILLEGAL_ARGUMENT_ERROR.
     * @param unit the unit e.g day? month? year?
     * @param status ICU error code returned here.
     * @return The formatted relative datetime
     * @draft ICU 64
     */
    FormattedRelativeDateTime formatToValue(
            double quantity,
            UDateDirection direction,
            UDateRelativeUnit unit,
            UErrorCode& status) const;
#endif  /* U_HIDE_DRAFT_API */

/**
     * Formats a relative date without a quantity.
     *
     * This method returns a String. To get more information about the
     * formatting result, use formatToValue().
     *
     * @param direction NEXT, LAST, THIS, etc.
     * @param unit e.g SATURDAY, DAY, MONTH
     * @param appendTo The string to which the formatted result will be
     *  appended. If the value of direction is documented as not being fully
     *  supported in all locales then this method leaves appendTo unchanged if
     *  no format string is available.
     * @param status ICU error code returned here.
     * @return appendTo
     * @stable ICU 53
     */
    UnicodeString& format(
            UDateDirection direction,
            UDateAbsoluteUnit unit,
            UnicodeString& appendTo,
            UErrorCode& status) const;

#ifndef U_HIDE_DRAFT_API
    /**
     * Formats a relative date without a quantity.
     *
     * This method returns a FormattedRelativeDateTime, which exposes more
     * information than the String returned by format().
     *
     * If the string is not available in the requested locale, the return
     * value will be empty (calling toString will give an empty string).
     *
     * @param direction NEXT, LAST, THIS, etc.
     * @param unit e.g SATURDAY, DAY, MONTH
     * @param status ICU error code returned here.
     * @return The formatted relative datetime
     * @draft ICU 64
     */
    FormattedRelativeDateTime formatToValue(
            UDateDirection direction,
            UDateAbsoluteUnit unit,
            UErrorCode& status) const;
#endif  /* U_HIDE_DRAFT_API */

/**
     * Format a combination of URelativeDateTimeUnit and numeric offset
     * using a numeric style, e.g. "1 week ago", "in 1 week",
     * "5 weeks ago", "in 5 weeks".
     *
     * This method returns a String. To get more information about the
     * formatting result, use formatNumericToValue().
     * 
     * @param offset    The signed offset for the specified unit. This
     *                  will be formatted according to this object's
     *                  NumberFormat object.
     * @param unit      The unit to use when formatting the relative
     *                  date, e.g. UDAT_REL_UNIT_WEEK,
     *                  UDAT_REL_UNIT_FRIDAY.
     * @param appendTo  The string to which the formatted result will be
     *                  appended.
     * @param status    ICU error code returned here.
     * @return          appendTo
     * @stable ICU 57
     */
    UnicodeString& formatNumeric(
            double offset,
            URelativeDateTimeUnit unit,
            UnicodeString& appendTo,
            UErrorCode& status) const;

#ifndef U_HIDE_DRAFT_API
    /**
     * Format a combination of URelativeDateTimeUnit and numeric offset
     * using a numeric style, e.g. "1 week ago", "in 1 week",
     * "5 weeks ago", "in 5 weeks".
     *
     * This method returns a FormattedRelativeDateTime, which exposes more
     * information than the String returned by formatNumeric().
     * 
     * @param offset    The signed offset for the specified unit. This
     *                  will be formatted according to this object's
     *                  NumberFormat object.
     * @param unit      The unit to use when formatting the relative
     *                  date, e.g. UDAT_REL_UNIT_WEEK,
     *                  UDAT_REL_UNIT_FRIDAY.
     * @param status    ICU error code returned here.
     * @return          The formatted relative datetime
     * @draft ICU 64
     */
    FormattedRelativeDateTime formatNumericToValue(
            double offset,
            URelativeDateTimeUnit unit,
            UErrorCode& status) const;
#endif  /* U_HIDE_DRAFT_API */

/**
     * Format a combination of URelativeDateTimeUnit and numeric offset
     * using a text style if possible, e.g. "last week", "this week",
     * "next week", "yesterday", "tomorrow". Falls back to numeric
     * style if no appropriate text term is available for the specified
     * offset in the object's locale.
     *
     * This method returns a String. To get more information about the
     * formatting result, use formatToValue().
     *
     * @param offset    The signed offset for the specified unit.
     * @param unit      The unit to use when formatting the relative
     *                  date, e.g. UDAT_REL_UNIT_WEEK,
     *                  UDAT_REL_UNIT_FRIDAY.
     * @param appendTo  The string to which the formatted result will be
     *                  appended.
     * @param status    ICU error code returned here.
     * @return          appendTo
     * @stable ICU 57
     */
    UnicodeString& format(
            double offset,
            URelativeDateTimeUnit unit,
            UnicodeString& appendTo,
            UErrorCode& status) const;

#ifndef U_HIDE_DRAFT_API
    /**
     * Format a combination of URelativeDateTimeUnit and numeric offset
     * using a text style if possible, e.g. "last week", "this week",
     * "next week", "yesterday", "tomorrow". Falls back to numeric
     * style if no appropriate text term is available for the specified
     * offset in the object's locale.
     *
     * This method returns a FormattedRelativeDateTime, which exposes more
     * information than the String returned by format().
     *
     * @param offset    The signed offset for the specified unit.
     * @param unit      The unit to use when formatting the relative
     *                  date, e.g. UDAT_REL_UNIT_WEEK,
     *                  UDAT_REL_UNIT_FRIDAY.
     * @param status    ICU error code returned here.
     * @return          The formatted relative datetime
     * @draft ICU 64
     */
    FormattedRelativeDateTime formatToValue(
            double offset,
            URelativeDateTimeUnit unit,
            UErrorCode& status) const;
#endif  /* U_HIDE_DRAFT_API */

/**
     * Combines a relative date string and a time string in this object's
     * locale. This is done with the same date-time separator used for the
     * default calendar in this locale.
     *
     * @param relativeDateString the relative date, e.g 'yesterday'
     * @param timeString the time e.g '3:45'
     * @param appendTo concatenated date and time appended here
     * @param status ICU error code returned here.
     * @return appendTo
     * @stable ICU 53
     */
    UnicodeString& combineDateAndTime(
            const UnicodeString& relativeDateString,
            const UnicodeString& timeString,
            UnicodeString& appendTo,
            UErrorCode& status) const;

/**
     * Returns the NumberFormat this object is using.
     *
     * @stable ICU 53
     */
    const NumberFormat& getNumberFormat() const;

/**
     * Returns the capitalization context.
     *
     * @stable ICU 54
     */
    UDisplayContext getCapitalizationContext() const;

/**
     * Returns the format style.
     *
     * @stable ICU 54
     */
    UDateRelativeDateTimeFormatterStyle getFormatStyle() const;

private:
    const RelativeDateTimeCacheData* fCache;
    const SharedNumberFormat *fNumberFormat;
    const SharedPluralRules *fPluralRules;
    UDateRelativeDateTimeFormatterStyle fStyle;
    UDisplayContext fContext;
    const SharedBreakIterator *fOptBreakIterator;
    Locale fLocale;
    void init(
            NumberFormat *nfToAdopt,
            BreakIterator *brkIter,
            UErrorCode &status);
    UnicodeString& adjustForContext(UnicodeString &) const;
    UBool checkNoAdjustForContext(UErrorCode& status) const;

template<typename F, typename... Args>
 UnicodeString& doFormat(
 F callback,
 UnicodeString& appendTo,
 UErrorCode& status,
 Args... args) const;

#ifndef U_HIDE_DRAFT_API // for FormattedRelativeDateTime
 template<typename F, typename... Args>
 FormattedRelativeDateTime doFormatToValue(
 F callback,
 UErrorCode& status,
 Args... args) const;
#endif // U_HIDE_DRAFT_API

void formatImpl(
            double quantity,
            UDateDirection direction,
            UDateRelativeUnit unit,
            FormattedRelativeDateTimeData& output,
            UErrorCode& status) const;
    void formatAbsoluteImpl(
            UDateDirection direction,
            UDateAbsoluteUnit unit,
            FormattedRelativeDateTimeData& output,
            UErrorCode& status) const;
    void formatNumericImpl(
            double offset,
            URelativeDateTimeUnit unit,
            FormattedRelativeDateTimeData& output,
            UErrorCode& status) const;
    void formatRelativeImpl(
            double offset,
            URelativeDateTimeUnit unit,
            FormattedRelativeDateTimeData& output,
            UErrorCode& status) const;
};

U_NAMESPACE_END

#endif /* !UCONFIG_NO_BREAK_ITERATION */
#endif /* !UCONFIG_NO_FORMATTING */

#endif /* U_SHOW_CPLUSPLUS_API */

#endif /* __RELDATEFMT_H */

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