GOLDEN HOUR

DIR: /usr/include/unicode

Name	Size	Action
alphaindex.h	26.48 KB
appendable.h	8.49 KB
basictz.h	9.27 KB
brkiter.h	27.8 KB
bytestream.h	10.78 KB
bytestrie.h	20.77 KB
bytestriebuilder.h	7.08 KB
calendar.h	105.74 KB
caniter.h	7.43 KB
casemap.h	25.33 KB
char16ptr.h	7.22 KB
chariter.h	24.05 KB
choicfmt.h	23.91 KB
coleitr.h	13.76 KB
coll.h	56.23 KB
compactdecimalformat.h	6.88 KB
curramt.h	3.76 KB
currpinf.h	7.3 KB
currunit.h	4 KB
datefmt.h	40.67 KB
dbbi.h	1.19 KB
dcfmtsym.h	20.41 KB
decimfmt.h	87.19 KB
docmain.h	6.97 KB
dtfmtsym.h	37.7 KB
dtintrv.h	3.84 KB
dtitvfmt.h	46.52 KB
dtitvinf.h	18.62 KB
dtptngen.h	25.8 KB
dtrule.h	8.68 KB
edits.h	20.74 KB
enumset.h	2.08 KB
errorcode.h	4.84 KB
fieldpos.h	8.69 KB
filteredbrk.h	5.37 KB
fmtable.h	24.42 KB
format.h	12.5 KB
formattedvalue.h	9.75 KB
fpositer.h	3.04 KB
gender.h	3.33 KB
gregocal.h	31.71 KB
icudataver.h	1.03 KB
icuplug.h	11.88 KB
idna.h	12.7 KB
listformatter.h	9.27 KB
localebuilder.h	11.23 KB
localematcher.h	24.56 KB
localpointer.h	19.36 KB
locdspnm.h	7.12 KB
locid.h	47.68 KB
measfmt.h	11.33 KB
measunit.h	95.28 KB
measure.h	4.32 KB
messagepattern.h	33.71 KB
msgfmt.h	44.11 KB
normalizer2.h	34.03 KB
normlzr.h	30.94 KB
nounit.h	2.69 KB
numberformatter.h	84.25 KB
numberrangeformatter.h	27.95 KB
numfmt.h	49.76 KB
numsys.h	7.32 KB
parseerr.h	3.08 KB
parsepos.h	5.56 KB
platform.h	28.08 KB
plurfmt.h	25.2 KB
plurrule.h	18.34 KB
ptypes.h	3.49 KB
putil.h	6.33 KB
rbbi.h	26.58 KB
rbnf.h	48.73 KB
rbtz.h	15.6 KB
regex.h	84.34 KB
region.h	9.18 KB
reldatefmt.h	22.27 KB
rep.h	9.37 KB
resbund.h	18.07 KB
schriter.h	6.32 KB
scientificnumberformatter.h	6.4 KB
search.h	22.22 KB
selfmt.h	14.3 KB
simpleformatter.h	12.59 KB
simpletz.h	45.44 KB
smpdtfmt.h	71.01 KB
sortkey.h	11.18 KB
std_string.h	1.05 KB
strenum.h	9.92 KB
stringoptions.h	5.79 KB
stringpiece.h	10.35 KB
stringtriebuilder.h	15.33 KB
stsearch.h	21.3 KB
symtable.h	4.27 KB
tblcoll.h	36.61 KB
timezone.h	41.02 KB
tmunit.h	3.38 KB
tmutamt.h	4.9 KB
tmutfmt.h	7.85 KB
translit.h	65.82 KB
tzfmt.h	42.89 KB
tznames.h	16.85 KB
tzrule.h	35.37 KB
tztrans.h	6.12 KB
ubidi.h	89.56 KB
ubiditransform.h	12.65 KB
ubrk.h	23.97 KB
ucal.h	56.9 KB
ucasemap.h	15.18 KB
ucat.h	5.36 KB
uchar.h	141.24 KB
ucharstrie.h	22.58 KB
ucharstriebuilder.h	7.21 KB
uchriter.h	13.2 KB
uclean.h	11.21 KB
ucnv.h	83.09 KB
ucnv_cb.h	6.59 KB
ucnv_err.h	20.99 KB
ucnvsel.h	6.14 KB
ucol.h	61.46 KB
ucoleitr.h	9.46 KB
uconfig.h	12.07 KB
ucpmap.h	5.53 KB
ucptrie.h	22.46 KB
ucsdet.h	14.67 KB
ucurr.h	16.12 KB
udat.h	61.38 KB
udata.h	15.56 KB
udateintervalformat.h	10.74 KB
udatpg.h	26.8 KB
udisplaycontext.h	5.89 KB
uenum.h	7.78 KB
ufieldpositer.h	4.36 KB
uformattable.h	10.94 KB
uformattedvalue.h	12.12 KB
ugender.h	2 KB
uidna.h	33.37 KB
uiter.h	22.77 KB
uldnames.h	10.45 KB
ulistformatter.h	10.83 KB
uloc.h	53.16 KB
ulocdata.h	11.26 KB
umachine.h	14.54 KB
umisc.h	1.33 KB
umsg.h	24.23 KB
umutablecptrie.h	8.24 KB
unifilt.h	3.96 KB
unifunct.h	4.04 KB
unimatch.h	6.1 KB
unirepl.h	3.38 KB
uniset.h	64.9 KB
unistr.h	170.43 KB
unorm.h	20.52 KB
unorm2.h	24.66 KB
unum.h	53.46 KB
unumberformatter.h	25.22 KB
unumsys.h	7.21 KB
uobject.h	10.68 KB
upluralrules.h	7.83 KB
uregex.h	72.05 KB
uregion.h	9.84 KB
ureldatefmt.h	17 KB
urename.h	131.3 KB
urep.h	5.38 KB
ures.h	36.54 KB
uscript.h	27.21 KB
usearch.h	38.12 KB
uset.h	40 KB
usetiter.h	9.55 KB
ushape.h	18 KB
uspoof.h	65.9 KB
usprep.h	8.14 KB
ustdio.h	38.54 KB
ustream.h	1.89 KB
ustring.h	72.47 KB
ustringtrie.h	3.15 KB
utext.h	58.13 KB
utf.h	7.86 KB
utf16.h	23.32 KB
utf32.h	763 B
utf8.h	30.96 KB
utf_old.h	45.83 KB
utmscale.h	13.78 KB
utrace.h	17.29 KB
utrans.h	25.52 KB
utypes.h	30.74 KB
uvernum.h	6.67 KB
uversion.h	6 KB
vtzone.h	20.3 KB

Edit: 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;

/**
 * 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.
 *
 * @stable ICU 64
 */
class U_I18N_API FormattedRelativeDateTime : public UMemory, public FormattedValue {
  public:
    /**
     * Default constructor; makes an empty FormattedRelativeDateTime.
     * @stable ICU 64
     */
    FormattedRelativeDateTime() : fData(nullptr), fErrorCode(U_INVALID_STATE_ERROR) {}

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

/**
     * Destruct an instance of FormattedRelativeDateTime.
     * @stable 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.
     * @stable 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;
};

/**
 * 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;

/**
     * 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
     * @stable ICU 64
     */
    FormattedRelativeDateTime formatToValue(
            double quantity,
            UDateDirection direction,
            UDateRelativeUnit unit,
            UErrorCode& status) const;

/**
     * 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;

/**
     * 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
     * @stable ICU 64
     */
    FormattedRelativeDateTime formatToValue(
            UDateDirection direction,
            UDateAbsoluteUnit unit,
            UErrorCode& status) const;

/**
     * 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;

/**
     * 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
     * @stable ICU 64
     */
    FormattedRelativeDateTime formatNumericToValue(
            double offset,
            URelativeDateTimeUnit unit,
            UErrorCode& status) const;

/**
     * 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;

/**
     * 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
     * @stable ICU 64
     */
    FormattedRelativeDateTime formatToValue(
            double offset,
            URelativeDateTimeUnit unit,
            UErrorCode& status) const;

/**
     * 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;

template<typename F, typename... Args>
 FormattedRelativeDateTime doFormatToValue(
 F callback,
 UErrorCode& status,
 Args... args) const;

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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Edit: reldatefmt.h

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