FM / unicode

/usr/include/unicode

Name	Size	Mode	Actions
alphaindex.h	27158	0644	edit dl rm
appendable.h	8739	0644	edit dl rm
basictz.h	10163	0644	edit dl rm
brkiter.h	28478	0644	edit dl rm
bytestream.h	11013	0644	edit dl rm
bytestrie.h	21268	0644	edit dl rm
bytestriebuilder.h	7640	0644	edit dl rm
calendar.h	108424	0644	edit dl rm
caniter.h	7621	0644	edit dl rm
casemap.h	25933	0644	edit dl rm
char16ptr.h	7393	0644	edit dl rm
chariter.h	24638	0644	edit dl rm
choicfmt.h	24544	0644	edit dl rm
coleitr.h	14102	0644	edit dl rm
coll.h	57615	0644	edit dl rm
compactdecimalformat.h	7047	0644	edit dl rm
curramt.h	3869	0644	edit dl rm
currpinf.h	7479	0644	edit dl rm
currunit.h	4112	0644	edit dl rm
datefmt.h	41690	0644	edit dl rm
dbbi.h	1223	0644	edit dl rm
dcfmtsym.h	21101	0644	edit dl rm
decimfmt.h	89676	0644	edit dl rm
docmain.h	7380	0644	edit dl rm
dtfmtsym.h	39126	0644	edit dl rm
dtintrv.h	3935	0644	edit dl rm
dtitvfmt.h	50448	0644	edit dl rm
dtitvinf.h	19072	0644	edit dl rm
dtptngen.h	26692	0644	edit dl rm
dtrule.h	8898	0644	edit dl rm
edits.h	21237	0644	edit dl rm
enumset.h	2130	0644	edit dl rm
errorcode.h	4956	0644	edit dl rm
fieldpos.h	8906	0644	edit dl rm
filteredbrk.h	5501	0644	edit dl rm
fmtable.h	25020	0644	edit dl rm
format.h	12802	0644	edit dl rm
formattedvalue.h	9987	0644	edit dl rm
fpositer.h	3107	0644	edit dl rm
gender.h	3408	0644	edit dl rm
gregocal.h	32642	0644	edit dl rm
icudataver.h	1049	0644	edit dl rm
icuplug.h	12109	0644	edit dl rm
idna.h	13000	0644	edit dl rm
listformatter.h	9004	0644	edit dl rm
localebuilder.h	11350	0644	edit dl rm
localematcher.h	27467	0644	edit dl rm
localpointer.h	19825	0644	edit dl rm
locdspnm.h	7292	0644	edit dl rm
locid.h	48804	0644	edit dl rm
measfmt.h	11690	0644	edit dl rm
measunit.h	107613	0644	edit dl rm
measure.h	4431	0644	edit dl rm
messagepattern.h	34517	0644	edit dl rm
msgfmt.h	45278	0644	edit dl rm
normalizer2.h	34466	0644	edit dl rm
normlzr.h	31690	0644	edit dl rm
nounit.h	2305	0644	edit dl rm
numberformatter.h	94505	0644	edit dl rm
numberrangeformatter.h	25790	0644	edit dl rm
numfmt.h	51034	0644	edit dl rm
numsys.h	7509	0644	edit dl rm
parseerr.h	3155	0644	edit dl rm
parsepos.h	5699	0644	edit dl rm
platform.h	28768	0644	edit dl rm
plurfmt.h	25847	0644	edit dl rm
plurrule.h	21316	0644	edit dl rm
ptypes.h	3577	0644	edit dl rm
putil.h	6471	0644	edit dl rm
rbbi.h	28413	0644	edit dl rm
rbnf.h	50021	0644	edit dl rm
rbtz.h	16210	0644	edit dl rm
regex.h	86385	0644	edit dl rm
region.h	9402	0644	edit dl rm
reldatefmt.h	22751	0644	edit dl rm
rep.h	9599	0644	edit dl rm
resbund.h	18513	0644	edit dl rm
schriter.h	6511	0644	edit dl rm
scientificnumberformatter.h	6589	0644	edit dl rm
search.h	22755	0644	edit dl rm
selfmt.h	14686	0644	edit dl rm
simpleformatter.h	12888	0644	edit dl rm
simpletz.h	46798	0644	edit dl rm
smpdtfmt.h	72778	0644	edit dl rm
sortkey.h	11452	0644	edit dl rm
std_string.h	1076	0644	edit dl rm
strenum.h	10157	0644	edit dl rm
stringoptions.h	5926	0644	edit dl rm
stringpiece.h	10287	0644	edit dl rm
stringtriebuilder.h	15842	0644	edit dl rm
stsearch.h	21926	0644	edit dl rm
symtable.h	4374	0644	edit dl rm
tblcoll.h	37801	0644	edit dl rm
timezone.h	44858	0644	edit dl rm
tmunit.h	3479	0644	edit dl rm
tmutamt.h	5029	0644	edit dl rm
tmutfmt.h	7602	0644	edit dl rm
translit.h	67397	0644	edit dl rm
tzfmt.h	43961	0644	edit dl rm
tznames.h	17251	0644	edit dl rm
tzrule.h	36450	0644	edit dl rm
tztrans.h	6278	0644	edit dl rm
ubidi.h	91759	0644	edit dl rm
ubiditransform.h	13003	0644	edit dl rm
ubrk.h	25043	0644	edit dl rm
ucal.h	62463	0644	edit dl rm
ucasemap.h	15579	0644	edit dl rm
ucat.h	5478	0644	edit dl rm
uchar.h	148111	0644	edit dl rm
ucharstrie.h	23066	0644	edit dl rm
ucharstriebuilder.h	7645	0644	edit dl rm
uchriter.h	13747	0644	edit dl rm
uclean.h	11468	0644	edit dl rm
ucnv.h	85051	0644	edit dl rm
ucnvsel.h	6339	0644	edit dl rm
ucnv_cb.h	6738	0644	edit dl rm
ucnv_err.h	21481	0644	edit dl rm
ucol.h	62987	0644	edit dl rm
ucoleitr.h	10056	0644	edit dl rm
uconfig.h	12356	0644	edit dl rm
ucpmap.h	5663	0644	edit dl rm
ucptrie.h	23044	0644	edit dl rm
ucsdet.h	15043	0644	edit dl rm
ucurr.h	17122	0644	edit dl rm
udat.h	63902	0644	edit dl rm
udata.h	16004	0644	edit dl rm
udateintervalformat.h	12218	0644	edit dl rm
udatpg.h	27405	0644	edit dl rm
udisplaycontext.h	6084	0644	edit dl rm
uenum.h	7981	0644	edit dl rm
ufieldpositer.h	4513	0644	edit dl rm
uformattable.h	11233	0644	edit dl rm
uformattedvalue.h	12600	0644	edit dl rm
ugender.h	2106	0644	edit dl rm
uidna.h	34229	0644	edit dl rm
uiter.h	23299	0644	edit dl rm
uldnames.h	10733	0644	edit dl rm
ulistformatter.h	11043	0644	edit dl rm
uloc.h	55936	0644	edit dl rm
ulocdata.h	11572	0644	edit dl rm
umachine.h	16439	0644	edit dl rm
umisc.h	1365	0644	edit dl rm
umsg.h	24832	0644	edit dl rm
umutablecptrie.h	8490	0644	edit dl rm
unifilt.h	4091	0644	edit dl rm
unifunct.h	4151	0644	edit dl rm
unimatch.h	6244	0644	edit dl rm
unirepl.h	3464	0644	edit dl rm
uniset.h	68108	0644	edit dl rm
unistr.h	174627	0644	edit dl rm
unorm.h	21042	0644	edit dl rm
unorm2.h	25269	0644	edit dl rm
unum.h	56269	0644	edit dl rm
unumberformatter.h	31177	0644	edit dl rm
unumberrangeformatter.h	15737	0644	edit dl rm
unumsys.h	7430	0644	edit dl rm
uobject.h	10934	0644	edit dl rm
upluralrules.h	8997	0644	edit dl rm
uregex.h	73719	0644	edit dl rm
uregion.h	10047	0644	edit dl rm
ureldatefmt.h	17448	0644	edit dl rm
urename.h	137853	0644	edit dl rm
urep.h	5507	0644	edit dl rm
ures.h	37418	0644	edit dl rm
uscript.h	28291	0644	edit dl rm
usearch.h	40153	0644	edit dl rm
uset.h	45503	0644	edit dl rm
usetiter.h	9910	0644	edit dl rm
ushape.h	18430	0644	edit dl rm
uspoof.h	67425	0644	edit dl rm
usprep.h	8382	0644	edit dl rm
ustdio.h	39482	0644	edit dl rm
ustream.h	1934	0644	edit dl rm
ustring.h	74096	0644	edit dl rm
ustringtrie.h	3224	0644	edit dl rm
utext.h	59471	0644	edit dl rm
utf.h	8057	0644	edit dl rm
utf8.h	31572	0644	edit dl rm
utf16.h	23910	0644	edit dl rm
utf32.h	763	0644	edit dl rm
utf_old.h	46929	0644	edit dl rm
utmscale.h	14107	0644	edit dl rm
utrace.h	17595	0644	edit dl rm
utrans.h	26157	0644	edit dl rm
utypes.h	31807	0644	edit dl rm
uvernum.h	6839	0644	edit dl rm
uversion.h	6137	0644	edit dl rm
vtzone.h	21303	0644	edit dl rm

Edit: /usr/include/unicode/numfmt.h (51034B)

// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
********************************************************************************
* Copyright (C) 1997-2016, International Business Machines Corporation and others.
* All Rights Reserved.
********************************************************************************
*
* File NUMFMT.H
*
* Modification History:
*
*   Date        Name        Description
*   02/19/97    aliu        Converted from java.
*   03/18/97    clhuang     Updated per C++ implementation.
*   04/17/97    aliu        Changed DigitCount to int per code review.
*    07/20/98    stephen        JDK 1.2 sync up. Added scientific support.
*                            Changed naming conventions to match C++ guidelines
*                            Deprecated Java style constants (eg, INTEGER_FIELD)
********************************************************************************
*/

#ifndef NUMFMT_H
#define NUMFMT_H

#include "unicode/utypes.h"

#if U_SHOW_CPLUSPLUS_API

/**
 * \file
 * \brief C++ API: Compatibility APIs for number formatting.
 */

#if !UCONFIG_NO_FORMATTING

#include "unicode/unistr.h"
#include "unicode/format.h"
#include "unicode/unum.h" // UNumberFormatStyle
#include "unicode/locid.h"
#include "unicode/stringpiece.h"
#include "unicode/curramt.h"
#include "unicode/udisplaycontext.h"

class NumberFormatTest;

U_NAMESPACE_BEGIN

class SharedNumberFormat;

#if !UCONFIG_NO_SERVICE
class NumberFormatFactory;
class StringEnumeration;
#endif

/**
 * IMPORTANT: New users are strongly encouraged to see if
 * numberformatter.h fits their use case. Although not deprecated, this header
 * is provided for backwards compatibility only.
 *
 * Abstract base class for all number formats. Provides interface for
 * formatting and parsing a number. Also provides methods for
 * determining which locales have number formats, and what their names
 * are.
 *
 * \headerfile unicode/numfmt.h "unicode/numfmt.h"
 * 
 * NumberFormat helps you to format and parse numbers for any locale.
 * Your code can be completely independent of the locale conventions
 * for decimal points, thousands-separators, or even the particular
 * decimal digits used, or whether the number format is even decimal.
 * 
 * To format a number for the current Locale, use one of the static
 * factory methods:
 * \code
 * #include <iostream>
 * #include "unicode/numfmt.h"
 * #include "unicode/unistr.h"
 * #include "unicode/ustream.h"
 * using namespace std;
 * 
 * int main() {
 * double myNumber = 7.0;
 * UnicodeString myString;
 * UErrorCode success = U_ZERO_ERROR;
 * NumberFormat* nf = NumberFormat::createInstance(success);
 * nf->format(myNumber, myString);
 * cout << " Example 1: " << myString << endl;
 * }
 * \endcode
 * Note that there are additional factory methods within subclasses of
 * NumberFormat.
 * 
 * If you are formatting multiple numbers, it is more efficient to get
 * the format and use it multiple times so that the system doesn't
 * have to fetch the information about the local language and country
 * conventions multiple times.
 * \code
 * UnicodeString myString;
 * UErrorCode success = U_ZERO_ERROR;
 * NumberFormat *nf = NumberFormat::createInstance( success );
 * for (int32_t number: {123, 3333, -1234567}) {
 * nf->format(number, myString);
 * myString += "; ";
 * }
 * cout << " Example 2: " << myString << endl;
 * \endcode
 * To format a number for a different Locale, specify it in the
 * call to \c createInstance().
 * \code
 * nf = NumberFormat::createInstance(Locale::getFrench(), success);
 * \endcode
 * You can use a \c NumberFormat to parse also.
 * \code
 * UErrorCode success;
 * Formattable result(-999); // initialized with error code
 * nf->parse(myString, result, success);
 * \endcode
 * Use \c createInstance() to get the normal number format for a \c Locale.
 * There are other static factory methods available. Use \c createCurrencyInstance()
 * to get the currency number format for that country. Use \c createPercentInstance()
 * to get a format for displaying percentages. With this format, a
 * fraction from 0.53 is displayed as 53%.
 * 
 * The type of number formatting can be specified by passing a 'style' parameter to \c createInstance().
 * For example, use\n
 * \c createInstance(locale, UNUM_DECIMAL, errorCode) to get the normal number format,\n
 * \c createInstance(locale, UNUM_PERCENT, errorCode) to get a format for displaying percentage,\n
 * \c createInstance(locale, UNUM_SCIENTIFIC, errorCode) to get a format for displaying scientific number,\n
 * \c createInstance(locale, UNUM_CURRENCY, errorCode) to get the currency number format,
 * in which the currency is represented by its symbol, for example, "$3.00".\n
 * \c createInstance(locale, UNUM_CURRENCY_ISO, errorCode) to get the currency number format,
 * in which the currency is represented by its ISO code, for example "USD3.00".\n
 * \c createInstance(locale, UNUM_CURRENCY_PLURAL, errorCode) to get the currency number format,
 * in which the currency is represented by its full name in plural format,
 * for example, "3.00 US dollars" or "1.00 US dollar".
 * 
 * You can also control the display of numbers with such methods as
 * \c getMinimumFractionDigits(). If you want even more control over the
 * format or parsing, or want to give your users more control, you can
 * try dynamic_casting the \c NumberFormat you get from the factory methods to a
 * \c DecimalFormat. This will work for the vast majority of
 * countries; just remember to test for NULL in case you
 * encounter an unusual one.
 * 
 * You can also use forms of the parse and format methods with
 * \c ParsePosition and \c FieldPosition to allow you to:
 * <ul type=round>
 * <li>(a) progressively parse through pieces of a string.
 * <li>(b) align the decimal point and other areas.
 * </ul>
 * For example, you can align numbers in two ways.
 * 
 * If you are using a monospaced font with spacing for alignment, you
 * can pass the \c FieldPosition in your format call, with field =
 * \c UNUM_INTEGER_FIELD. On output, \c getEndIndex will be set to the offset
 * between the last character of the integer and the decimal. Add
 * (desiredSpaceCount - getEndIndex) spaces at the front of the
 * string.
 * 
 * If you are using proportional fonts, instead of padding with
 * spaces, measure the width of the string in pixels from the start to
 * getEndIndex. Then move the pen by (desiredPixelWidth -
 * widthToAlignmentPoint) before drawing the text. It also works
 * where there is no decimal, but possibly additional characters at
 * the end, e.g. with parentheses in negative numbers: "(12)" for -12.
 * 
 * User subclasses are not supported. While clients may write
 * subclasses, such code will not necessarily work and will not be
 * guaranteed to work stably from release to release.
 *
 * @stable ICU 2.0
 */
class U_I18N_API NumberFormat : public Format {
public:
 /**
 * Rounding mode.
 *
 * 
 * For more detail on rounding modes, see:
 * https://unicode-org.github.io/icu/userguide/format_parse/numbers/rounding-modes
 *
 * @stable ICU 2.4
 */
 enum ERoundingMode {
 kRoundCeiling, /**< Round towards positive infinity */
 kRoundFloor, /**< Round towards negative infinity */
 kRoundDown, /**< Round towards zero */
 kRoundUp, /**< Round away from zero */
 kRoundHalfEven, /**< Round towards the nearest integer, or
 towards the nearest even integer if equidistant */
 kRoundHalfDown, /**< Round towards the nearest integer, or
 towards zero if equidistant */
 kRoundHalfUp, /**< Round towards the nearest integer, or
 away from zero if equidistant */
 /**
 * Return U_FORMAT_INEXACT_ERROR if number does not format exactly.
 * @stable ICU 4.8
 */
 kRoundUnnecessary
 };

/**
     * Alignment Field constants used to construct a FieldPosition object.
     * Signifies that the position of the integer part or fraction part of
     * a formatted number should be returned.
     *
     * Note: as of ICU 4.4, the values in this enum have been extended to
     * support identification of all number format fields, not just those
     * pertaining to alignment.
     *
     * These constants are provided for backwards compatibility only.
     * Please use the C style constants defined in the header file unum.h.
     *
     * @see FieldPosition
     * @stable ICU 2.0
     */
    enum EAlignmentFields {
        /** @stable ICU 2.0 */
        kIntegerField = UNUM_INTEGER_FIELD,
        /** @stable ICU 2.0 */
        kFractionField = UNUM_FRACTION_FIELD,
        /** @stable ICU 2.0 */
        kDecimalSeparatorField = UNUM_DECIMAL_SEPARATOR_FIELD,
        /** @stable ICU 2.0 */
        kExponentSymbolField = UNUM_EXPONENT_SYMBOL_FIELD,
        /** @stable ICU 2.0 */
        kExponentSignField = UNUM_EXPONENT_SIGN_FIELD,
        /** @stable ICU 2.0 */
        kExponentField = UNUM_EXPONENT_FIELD,
        /** @stable ICU 2.0 */
        kGroupingSeparatorField = UNUM_GROUPING_SEPARATOR_FIELD,
        /** @stable ICU 2.0 */
        kCurrencyField = UNUM_CURRENCY_FIELD,
        /** @stable ICU 2.0 */
        kPercentField = UNUM_PERCENT_FIELD,
        /** @stable ICU 2.0 */
        kPermillField = UNUM_PERMILL_FIELD,
        /** @stable ICU 2.0 */
        kSignField = UNUM_SIGN_FIELD,
        /** @stable ICU 64 */
        kMeasureUnitField = UNUM_MEASURE_UNIT_FIELD,
        /** @stable ICU 64 */
        kCompactField = UNUM_COMPACT_FIELD,

/**
     * These constants are provided for backwards compatibility only.
     * Please use the constants defined in the header file unum.h.
     */
        /** @stable ICU 2.0 */
        INTEGER_FIELD        = UNUM_INTEGER_FIELD,
        /** @stable ICU 2.0 */
        FRACTION_FIELD       = UNUM_FRACTION_FIELD
    };

/**
     * Destructor.
     * @stable ICU 2.0
     */
    virtual ~NumberFormat();

/**
     * Clones this object polymorphically.
     * The caller owns the result and should delete it when done.
     * @return clone, or nullptr if an error occurred
     * @stable ICU 2.0
     */
    virtual NumberFormat* clone() const override = 0;

/**
     * Return true if the given Format objects are semantically equal.
     * Objects of different subclasses are considered unequal.
     * @return    true if the given Format objects are semantically equal.
     * @stable ICU 2.0
     */
    virtual bool operator==(const Format& other) const override;

using Format::format;

/**
     * Format an object to produce a string.  This method handles
     * Formattable objects with numeric types. If the Formattable
     * object type is not a numeric type, then it returns a failing
     * UErrorCode.
     *
     * @param obj       The object to format.
     * @param appendTo  Output parameter to receive result.
     *                  Result is appended to existing contents.
     * @param pos       On input: an alignment field, if desired.
     *                  On output: the offsets of the alignment field.
     * @param status    Output param filled with success/failure status.
     * @return          Reference to 'appendTo' parameter.
     * @stable ICU 2.0
     */
    virtual UnicodeString& format(const Formattable& obj,
                                  UnicodeString& appendTo,
                                  FieldPosition& pos,
                                  UErrorCode& status) const override;

/**
     * Format an object to produce a string.  This method handles
     * Formattable objects with numeric types. If the Formattable
     * object type is not a numeric type, then it returns a failing
     * UErrorCode.
     *
     * @param obj       The object to format.
     * @param appendTo  Output parameter to receive result.
     *                  Result is appended to existing contents.
     * @param posIter   On return, can be used to iterate over positions
     *                  of fields generated by this format call.  Can be
     *                  NULL.
     * @param status    Output param filled with success/failure status.
     * @return          Reference to 'appendTo' parameter.
     * @stable ICU 4.4
     */
    virtual UnicodeString& format(const Formattable& obj,
                                  UnicodeString& appendTo,
                                  FieldPositionIterator* posIter,
                                  UErrorCode& status) const override;

/**
 * Parse a string to produce an object. This methods handles
 * parsing of numeric strings into Formattable objects with numeric
 * types.
 * 
 * Before calling, set parse_pos.index to the offset you want to
 * start parsing at in the source. After calling, parse_pos.index
 * indicates the position after the successfully parsed text. If
 * an error occurs, parse_pos.index is unchanged.
 * 
 * When parsing, leading whitespace is discarded (with successful
 * parse), while trailing whitespace is left as is.
 * 
 * See Format::parseObject() for more.
 *
 * @param source The string to be parsed into an object.
 * @param result Formattable to be set to the parse result.
 * If parse fails, return contents are undefined.
 * @param parse_pos The position to start parsing at. Upon return
 * this param is set to the position after the
 * last character successfully parsed. If the
 * source is not parsed successfully, this param
 * will remain unchanged.
 * @return A newly created Formattable* object, or NULL
 * on failure. The caller owns this and should
 * delete it when done.
 * @stable ICU 2.0
 */
 virtual void parseObject(const UnicodeString& source,
 Formattable& result,
 ParsePosition& parse_pos) const override;

/**
     * Format a double number. These methods call the NumberFormat
     * pure virtual format() methods with the default FieldPosition.
     *
     * @param number    The value to be formatted.
     * @param appendTo  Output parameter to receive result.
     *                  Result is appended to existing contents.
     * @return          Reference to 'appendTo' parameter.
     * @stable ICU 2.0
     */
    UnicodeString& format(  double number,
                            UnicodeString& appendTo) const;

/**
     * Format a long number. These methods call the NumberFormat
     * pure virtual format() methods with the default FieldPosition.
     *
     * @param number    The value to be formatted.
     * @param appendTo  Output parameter to receive result.
     *                  Result is appended to existing contents.
     * @return          Reference to 'appendTo' parameter.
     * @stable ICU 2.0
     */
    UnicodeString& format(  int32_t number,
                            UnicodeString& appendTo) const;

/**
     * Format an int64 number. These methods call the NumberFormat
     * pure virtual format() methods with the default FieldPosition.
     *
     * @param number    The value to be formatted.
     * @param appendTo  Output parameter to receive result.
     *                  Result is appended to existing contents.
     * @return          Reference to 'appendTo' parameter.
     * @stable ICU 2.8
     */
    UnicodeString& format(  int64_t number,
                            UnicodeString& appendTo) const;

/**
     * Format a double number. Concrete subclasses must implement
     * these pure virtual methods.
     *
     * @param number    The value to be formatted.
     * @param appendTo  Output parameter to receive result.
     *                  Result is appended to existing contents.
     * @param pos       On input: an alignment field, if desired.
     *                  On output: the offsets of the alignment field.
     * @return          Reference to 'appendTo' parameter.
     * @stable ICU 2.0
     */
    virtual UnicodeString& format(double number,
                                  UnicodeString& appendTo,
                                  FieldPosition& pos) const = 0;
    /**
     * Format a double number. By default, the parent function simply
     * calls the base class and does not return an error status.
     * Therefore, the status may be ignored in some subclasses.
     *
     * @param number    The value to be formatted.
     * @param appendTo  Output parameter to receive result.
     *                  Result is appended to existing contents.
     * @param pos       On input: an alignment field, if desired.
     *                  On output: the offsets of the alignment field.
     * @param status    error status
     * @return          Reference to 'appendTo' parameter.
     * @internal
     */
    virtual UnicodeString& format(double number,
                                  UnicodeString& appendTo,
                                  FieldPosition& pos,
                                  UErrorCode &status) const;
    /**
     * Format a double number. Subclasses must implement
     * this method.
     *
     * @param number    The value to be formatted.
     * @param appendTo  Output parameter to receive result.
     *                  Result is appended to existing contents.
     * @param posIter   On return, can be used to iterate over positions
     *                  of fields generated by this format call.
     *                  Can be NULL.
     * @param status    Output param filled with success/failure status.
     * @return          Reference to 'appendTo' parameter.
     * @stable ICU 4.4
     */
    virtual UnicodeString& format(double number,
                                  UnicodeString& appendTo,
                                  FieldPositionIterator* posIter,
                                  UErrorCode& status) const;
    /**
     * Format a long number. Concrete subclasses must implement
     * these pure virtual methods.
     *
     * @param number    The value to be formatted.
     * @param appendTo  Output parameter to receive result.
     *                  Result is appended to existing contents.
     * @param pos       On input: an alignment field, if desired.
     *                  On output: the offsets of the alignment field.
     * @return          Reference to 'appendTo' parameter.
     * @stable ICU 2.0
    */
    virtual UnicodeString& format(int32_t number,
                                  UnicodeString& appendTo,
                                  FieldPosition& pos) const = 0;

/**
     * Format a long number. Concrete subclasses may override
     * this function to provide status return.
     *
     * @param number    The value to be formatted.
     * @param appendTo  Output parameter to receive result.
     *                  Result is appended to existing contents.
     * @param pos       On input: an alignment field, if desired.
     *                  On output: the offsets of the alignment field.
     * @param status the output status.
     * @return          Reference to 'appendTo' parameter.
     * @internal
    */
    virtual UnicodeString& format(int32_t number,
                                  UnicodeString& appendTo,
                                  FieldPosition& pos,
                                  UErrorCode &status) const;

/**
     * Format an int32 number. Subclasses must implement
     * this method.
     *
     * @param number    The value to be formatted.
     * @param appendTo  Output parameter to receive result.
     *                  Result is appended to existing contents.
     * @param posIter   On return, can be used to iterate over positions
     *                  of fields generated by this format call.
     *                  Can be NULL.
     * @param status    Output param filled with success/failure status.
     * @return          Reference to 'appendTo' parameter.
     * @stable ICU 4.4
     */
    virtual UnicodeString& format(int32_t number,
                                  UnicodeString& appendTo,
                                  FieldPositionIterator* posIter,
                                  UErrorCode& status) const;
    /**
     * Format an int64 number. (Not abstract to retain compatibility
     * with earlier releases, however subclasses should override this
     * method as it just delegates to format(int32_t number...);
     *
     * @param number    The value to be formatted.
     * @param appendTo  Output parameter to receive result.
     *                  Result is appended to existing contents.
     * @param pos       On input: an alignment field, if desired.
     *                  On output: the offsets of the alignment field.
     * @return          Reference to 'appendTo' parameter.
     * @stable ICU 2.8
    */
    virtual UnicodeString& format(int64_t number,
                                  UnicodeString& appendTo,
                                  FieldPosition& pos) const;

/**
     * Format an int64 number. (Not abstract to retain compatibility
     * with earlier releases, however subclasses should override this
     * method as it just delegates to format(int32_t number...);
     *
     * @param number    The value to be formatted.
     * @param appendTo  Output parameter to receive result.
     *                  Result is appended to existing contents.
     * @param pos       On input: an alignment field, if desired.
     *                  On output: the offsets of the alignment field.
     * @param status    Output param filled with success/failure status.
     * @return          Reference to 'appendTo' parameter.
     * @internal
    */
    virtual UnicodeString& format(int64_t number,
                                  UnicodeString& appendTo,
                                  FieldPosition& pos,
                                  UErrorCode& status) const;
    /**
     * Format an int64 number. Subclasses must implement
     * this method.
     *
     * @param number    The value to be formatted.
     * @param appendTo  Output parameter to receive result.
     *                  Result is appended to existing contents.
     * @param posIter   On return, can be used to iterate over positions
     *                  of fields generated by this format call.
     *                  Can be NULL.
     * @param status    Output param filled with success/failure status.
     * @return          Reference to 'appendTo' parameter.
     * @stable ICU 4.4
     */
    virtual UnicodeString& format(int64_t number,
                                  UnicodeString& appendTo,
                                  FieldPositionIterator* posIter,
                                  UErrorCode& status) const;

/**
     * Format a decimal number. Subclasses must implement
     * this method.  The syntax of the unformatted number is a "numeric string"
     * as defined in the Decimal Arithmetic Specification, available at
     * http://speleotrove.com/decimal
     *
     * @param number    The unformatted number, as a string, to be formatted.
     * @param appendTo  Output parameter to receive result.
     *                  Result is appended to existing contents.
     * @param posIter   On return, can be used to iterate over positions
     *                  of fields generated by this format call.
     *                  Can be NULL.
     * @param status    Output param filled with success/failure status.
     * @return          Reference to 'appendTo' parameter.
     * @stable ICU 4.4
     */
    virtual UnicodeString& format(StringPiece number,
                                  UnicodeString& appendTo,
                                  FieldPositionIterator* posIter,
                                  UErrorCode& status) const;

// Can't use #ifndef U_HIDE_INTERNAL_API because these are virtual methods

/**
     * Format a decimal number.
     * The number is a DecimalQuantity wrapper onto a floating point decimal number.
     * The default implementation in NumberFormat converts the decimal number
     * to a double and formats that.  Subclasses of NumberFormat that want
     * to specifically handle big decimal numbers must override this method.
     * class DecimalFormat does so.
     *
     * @param number    The number, a DecimalQuantity format Decimal Floating Point.
     * @param appendTo  Output parameter to receive result.
     *                  Result is appended to existing contents.
     * @param posIter   On return, can be used to iterate over positions
     *                  of fields generated by this format call.
     * @param status    Output param filled with success/failure status.
     * @return          Reference to 'appendTo' parameter.
     * @internal
     */
    virtual UnicodeString& format(const number::impl::DecimalQuantity &number,
                                  UnicodeString& appendTo,
                                  FieldPositionIterator* posIter,
                                  UErrorCode& status) const;

/**
     * Format a decimal number.
     * The number is a DecimalQuantity wrapper onto a floating point decimal number.
     * The default implementation in NumberFormat converts the decimal number
     * to a double and formats that.  Subclasses of NumberFormat that want
     * to specifically handle big decimal numbers must override this method.
     * class DecimalFormat does so.
     *
     * @param number    The number, a DecimalQuantity format Decimal Floating Point.
     * @param appendTo  Output parameter to receive result.
     *                  Result is appended to existing contents.
     * @param pos       On input: an alignment field, if desired.
     *                  On output: the offsets of the alignment field.
     * @param status    Output param filled with success/failure status.
     * @return          Reference to 'appendTo' parameter.
     * @internal
     */
    virtual UnicodeString& format(const number::impl::DecimalQuantity &number,
                                  UnicodeString& appendTo,
                                  FieldPosition& pos,
                                  UErrorCode& status) const;

/**
 * Return a long if possible (e.g. within range LONG_MAX,
 * LONG_MAX], and with no decimals), otherwise a double. If
 * IntegerOnly is set, will stop at a decimal point (or equivalent;
 * e.g. for rational numbers "1 2/3", will stop after the 1).
 * 
 * If no object can be parsed, index is unchanged, and NULL is
 * returned.
 * 
 * This is a pure virtual which concrete subclasses must implement.
 *
 * @param text The text to be parsed.
 * @param result Formattable to be set to the parse result.
 * If parse fails, return contents are undefined.
 * @param parsePosition The position to start parsing at on input.
 * On output, moved to after the last successfully
 * parse character. On parse failure, does not change.
 * @stable ICU 2.0
 */
 virtual void parse(const UnicodeString& text,
 Formattable& result,
 ParsePosition& parsePosition) const = 0;

/**
     * Parse a string as a numeric value, and return a Formattable
     * numeric object. This method parses integers only if IntegerOnly
     * is set.
     *
     * @param text          The text to be parsed.
     * @param result        Formattable to be set to the parse result.
     *                      If parse fails, return contents are undefined.
     * @param status        Output parameter set to a failure error code
     *                      when a failure occurs. The error code when the
     *                      string fails to parse is U_INVALID_FORMAT_ERROR,
     *                      unless overridden by a subclass.
     * @see                 NumberFormat::isParseIntegerOnly
     * @stable ICU 2.0
     */
    virtual void parse(const UnicodeString& text,
                       Formattable& result,
                       UErrorCode& status) const;

/**
 * Parses text from the given string as a currency amount. Unlike
 * the parse() method, this method will attempt to parse a generic
 * currency name, searching for a match of this object's locale's
 * currency display names, or for a 3-letter ISO currency code.
 * This method will fail if this format is not a currency format,
 * that is, if it does not contain the currency pattern symbol
 * (U+00A4) in its prefix or suffix.
 *
 * @param text the string to parse
 * @param pos input-output position; on input, the position within text
 * to match; must have 0 <= pos.getIndex() < text.length();
 * on output, the position after the last matched character.
 * If the parse fails, the position in unchanged upon output.
 * @return if parse succeeds, a pointer to a newly-created CurrencyAmount
 * object (owned by the caller) containing information about
 * the parsed currency; if parse fails, this is NULL.
 * @stable ICU 49
 */
 virtual CurrencyAmount* parseCurrency(const UnicodeString& text,
 ParsePosition& pos) const;

/**
     * Return true if this format will parse numbers as integers
     * only.  For example in the English locale, with ParseIntegerOnly
     * true, the string "1234." would be parsed as the integer value
     * 1234 and parsing would stop at the "." character.  Of course,
     * the exact format accepted by the parse operation is locale
     * dependent and determined by sub-classes of NumberFormat.
     * @return    true if this format will parse numbers as integers
     *            only.
     * @stable ICU 2.0
     */
    UBool isParseIntegerOnly(void) const;

/**
     * Sets whether or not numbers should be parsed as integers only.
     * @param value    set True, this format will parse numbers as integers
     *                 only.
     * @see isParseIntegerOnly
     * @stable ICU 2.0
     */
    virtual void setParseIntegerOnly(UBool value);

/**
     * Sets whether lenient parsing should be enabled (it is off by default).
     *
     * @param enable \c true if lenient parsing should be used,
     *               \c false otherwise.
     * @stable ICU 4.8
     */
    virtual void setLenient(UBool enable);

/**
     * Returns whether lenient parsing is enabled (it is off by default).
     *
     * @return \c true if lenient parsing is enabled,
     *         \c false otherwise.
     * @see #setLenient
     * @stable ICU 4.8
     */
    virtual UBool isLenient(void) const;

/**
 * Create a default style NumberFormat for the current default locale.
 * The default formatting style is locale dependent.
 * 
 * NOTE: New users are strongly encouraged to use
 * {@link icu::number::NumberFormatter} instead of NumberFormat.
 * @stable ICU 2.0
 */
 static NumberFormat* U_EXPORT2 createInstance(UErrorCode&);

/**
 * Create a default style NumberFormat for the specified locale.
 * The default formatting style is locale dependent.
 * @param inLocale the given locale.
 * 
 * NOTE: New users are strongly encouraged to use
 * {@link icu::number::NumberFormatter} instead of NumberFormat.
 * @stable ICU 2.0
 */
 static NumberFormat* U_EXPORT2 createInstance(const Locale& inLocale,
 UErrorCode&);

/**
 * Create a specific style NumberFormat for the specified locale.
 * 
 * NOTE: New users are strongly encouraged to use
 * {@link icu::number::NumberFormatter} instead of NumberFormat.
 * @param desiredLocale the given locale.
 * @param style the given style.
 * @param errorCode Output param filled with success/failure status.
 * @return A new NumberFormat instance.
 * @stable ICU 4.8
 */
 static NumberFormat* U_EXPORT2 createInstance(const Locale& desiredLocale,
 UNumberFormatStyle style,
 UErrorCode& errorCode);

#ifndef U_HIDE_INTERNAL_API

/**
     * ICU use only.
     * Creates NumberFormat instance without using the cache.
     * @internal
     */
    static NumberFormat* internalCreateInstance(
            const Locale& desiredLocale,
            UNumberFormatStyle style,
            UErrorCode& errorCode);

/**
     * ICU use only.
     * Returns handle to the shared, cached NumberFormat instance for given
     * locale. On success, caller must call removeRef() on returned value
     * once it is done with the shared instance.
     * @internal
     */
    static const SharedNumberFormat* U_EXPORT2 createSharedInstance(
            const Locale& inLocale, UNumberFormatStyle style, UErrorCode& status);

#endif  /* U_HIDE_INTERNAL_API */

/**
 * Returns a currency format for the current default locale.
 * 
 * NOTE: New users are strongly encouraged to use
 * {@link icu::number::NumberFormatter} instead of NumberFormat.
 * @stable ICU 2.0
 */
 static NumberFormat* U_EXPORT2 createCurrencyInstance(UErrorCode&);

/**
 * Returns a currency format for the specified locale.
 * 
 * NOTE: New users are strongly encouraged to use
 * {@link icu::number::NumberFormatter} instead of NumberFormat.
 * @param inLocale the given locale.
 * @stable ICU 2.0
 */
 static NumberFormat* U_EXPORT2 createCurrencyInstance(const Locale& inLocale,
 UErrorCode&);

/**
 * Returns a percentage format for the current default locale.
 * 
 * NOTE: New users are strongly encouraged to use
 * {@link icu::number::NumberFormatter} instead of NumberFormat.
 * @stable ICU 2.0
 */
 static NumberFormat* U_EXPORT2 createPercentInstance(UErrorCode&);

/**
 * Returns a percentage format for the specified locale.
 * 
 * NOTE: New users are strongly encouraged to use
 * {@link icu::number::NumberFormatter} instead of NumberFormat.
 * @param inLocale the given locale.
 * @stable ICU 2.0
 */
 static NumberFormat* U_EXPORT2 createPercentInstance(const Locale& inLocale,
 UErrorCode&);

/**
 * Returns a scientific format for the current default locale.
 * 
 * NOTE: New users are strongly encouraged to use
 * {@link icu::number::NumberFormatter} instead of NumberFormat.
 * @stable ICU 2.0
 */
 static NumberFormat* U_EXPORT2 createScientificInstance(UErrorCode&);

/**
 * Returns a scientific format for the specified locale.
 * 
 * NOTE: New users are strongly encouraged to use
 * {@link icu::number::NumberFormatter} instead of NumberFormat.
 * @param inLocale the given locale.
 * @stable ICU 2.0
 */
 static NumberFormat* U_EXPORT2 createScientificInstance(const Locale& inLocale,
 UErrorCode&);

/**
     * Get the set of Locales for which NumberFormats are installed.
     * @param count    Output param to receive the size of the locales
     * @stable ICU 2.0
     */
    static const Locale* U_EXPORT2 getAvailableLocales(int32_t& count);

#if !UCONFIG_NO_SERVICE
    /**
     * Register a new NumberFormatFactory.  The factory will be adopted.
     * Because ICU may choose to cache NumberFormat objects internally,
     * this must be called at application startup, prior to any calls to
     * NumberFormat::createInstance to avoid undefined behavior.
     * @param toAdopt the NumberFormatFactory instance to be adopted
     * @param status the in/out status code, no special meanings are assigned
     * @return a registry key that can be used to unregister this factory
     * @stable ICU 2.6
     */
    static URegistryKey U_EXPORT2 registerFactory(NumberFormatFactory* toAdopt, UErrorCode& status);

/**
     * Unregister a previously-registered NumberFormatFactory using the key returned from the
     * register call.  Key becomes invalid after a successful call and should not be used again.
     * The NumberFormatFactory corresponding to the key will be deleted.
     * Because ICU may choose to cache NumberFormat objects internally,
     * this should be called during application shutdown, after all calls to
     * NumberFormat::createInstance to avoid undefined behavior.
     * @param key the registry key returned by a previous call to registerFactory
     * @param status the in/out status code, no special meanings are assigned
     * @return true if the factory for the key was successfully unregistered
     * @stable ICU 2.6
     */
    static UBool U_EXPORT2 unregister(URegistryKey key, UErrorCode& status);

/**
     * Return a StringEnumeration over the locales available at the time of the call,
     * including registered locales.
     * @return a StringEnumeration over the locales available at the time of the call
     * @stable ICU 2.6
     */
    static StringEnumeration* U_EXPORT2 getAvailableLocales(void);
#endif /* UCONFIG_NO_SERVICE */

/**
     * Returns true if grouping is used in this format. For example,
     * in the English locale, with grouping on, the number 1234567
     * might be formatted as "1,234,567". The grouping separator as
     * well as the size of each group is locale dependent and is
     * determined by sub-classes of NumberFormat.
     * @see setGroupingUsed
     * @stable ICU 2.0
     */
    UBool isGroupingUsed(void) const;

/**
     * Set whether or not grouping will be used in this format.
     * @param newValue    True, grouping will be used in this format.
     * @see getGroupingUsed
     * @stable ICU 2.0
     */
    virtual void setGroupingUsed(UBool newValue);

/**
     * Returns the maximum number of digits allowed in the integer portion of a
     * number.
     * @return     the maximum number of digits allowed in the integer portion of a
     *             number.
     * @see setMaximumIntegerDigits
     * @stable ICU 2.0
     */
    int32_t getMaximumIntegerDigits(void) const;

/**
     * Sets the maximum number of digits allowed in the integer portion of a
     * number. maximumIntegerDigits must be >= minimumIntegerDigits.  If the
     * new value for maximumIntegerDigits is less than the current value
     * of minimumIntegerDigits, then minimumIntegerDigits will also be set to
     * the new value.
     *
     * @param newValue    the new value for the maximum number of digits
     *                    allowed in the integer portion of a number.
     * @see getMaximumIntegerDigits
     * @stable ICU 2.0
     */
    virtual void setMaximumIntegerDigits(int32_t newValue);

/**
     * Returns the minimum number of digits allowed in the integer portion of a
     * number.
     * @return    the minimum number of digits allowed in the integer portion of a
     *            number.
     * @see setMinimumIntegerDigits
     * @stable ICU 2.0
     */
    int32_t getMinimumIntegerDigits(void) const;

/**
     * Sets the minimum number of digits allowed in the integer portion of a
     * number. minimumIntegerDigits must be &lt;= maximumIntegerDigits.  If the
     * new value for minimumIntegerDigits exceeds the current value
     * of maximumIntegerDigits, then maximumIntegerDigits will also be set to
     * the new value.
     * @param newValue    the new value to be set.
     * @see getMinimumIntegerDigits
     * @stable ICU 2.0
     */
    virtual void setMinimumIntegerDigits(int32_t newValue);

/**
     * Returns the maximum number of digits allowed in the fraction portion of a
     * number.
     * @return    the maximum number of digits allowed in the fraction portion of a
     *            number.
     * @see setMaximumFractionDigits
     * @stable ICU 2.0
     */
    int32_t getMaximumFractionDigits(void) const;

/**
     * Sets the maximum number of digits allowed in the fraction portion of a
     * number. maximumFractionDigits must be >= minimumFractionDigits.  If the
     * new value for maximumFractionDigits is less than the current value
     * of minimumFractionDigits, then minimumFractionDigits will also be set to
     * the new value.
     * @param newValue    the new value to be set.
     * @see getMaximumFractionDigits
     * @stable ICU 2.0
     */
    virtual void setMaximumFractionDigits(int32_t newValue);

/**
     * Returns the minimum number of digits allowed in the fraction portion of a
     * number.
     * @return    the minimum number of digits allowed in the fraction portion of a
     *            number.
     * @see setMinimumFractionDigits
     * @stable ICU 2.0
     */
    int32_t getMinimumFractionDigits(void) const;

/**
     * Sets the minimum number of digits allowed in the fraction portion of a
     * number. minimumFractionDigits must be &lt;= maximumFractionDigits.   If the
     * new value for minimumFractionDigits exceeds the current value
     * of maximumFractionDigits, then maximumIntegerDigits will also be set to
     * the new value
     * @param newValue    the new value to be set.
     * @see getMinimumFractionDigits
     * @stable ICU 2.0
     */
    virtual void setMinimumFractionDigits(int32_t newValue);

/**
     * Sets the currency used to display currency
     * amounts.  This takes effect immediately, if this format is a
     * currency format.  If this format is not a currency format, then
     * the currency is used if and when this object becomes a
     * currency format.
     * @param theCurrency a 3-letter ISO code indicating new currency
     * to use.  It need not be null-terminated.  May be the empty
     * string or NULL to indicate no currency.
     * @param ec input-output error code
     * @stable ICU 3.0
     */
    virtual void setCurrency(const char16_t* theCurrency, UErrorCode& ec);

/**
     * Gets the currency used to display currency
     * amounts.  This may be an empty string for some subclasses.
     * @return a 3-letter null-terminated ISO code indicating
     * the currency in use, or a pointer to the empty string.
     * @stable ICU 2.6
     */
    const char16_t* getCurrency() const;

/**
     * Set a particular UDisplayContext value in the formatter, such as
     * UDISPCTX_CAPITALIZATION_FOR_STANDALONE.
     * @param value The UDisplayContext value to set.
     * @param status Input/output status. If at entry this indicates a failure
     *               status, the function will do nothing; otherwise this will be
     *               updated with any new status from the function.
     * @stable ICU 53
     */
    virtual void setContext(UDisplayContext value, UErrorCode& status);

/**
     * Get the formatter's UDisplayContext value for the specified UDisplayContextType,
     * such as UDISPCTX_TYPE_CAPITALIZATION.
     * @param type The UDisplayContextType whose value to return
     * @param status Input/output status. If at entry this indicates a failure
     *               status, the function will do nothing; otherwise this will be
     *               updated with any new status from the function.
     * @return The UDisplayContextValue for the specified type.
     * @stable ICU 53
     */
    virtual UDisplayContext getContext(UDisplayContextType type, UErrorCode& status) const;

/**
     * Get the rounding mode. This will always return NumberFormat::ERoundingMode::kRoundUnnecessary
     * if the subclass does not support rounding. 
     * @return A rounding mode
     * @stable ICU 60
     */
    virtual ERoundingMode getRoundingMode(void) const;

/**
     * Set the rounding mode. If a subclass does not support rounding, this will do nothing.
     * @param roundingMode A rounding mode
     * @stable ICU 60
     */
    virtual void setRoundingMode(ERoundingMode roundingMode);

public:

/**
     * Return the class ID for this class.  This is useful for
     * comparing to a return value from getDynamicClassID(). Note that,
     * because NumberFormat is an abstract base class, no fully constructed object
     * will have the class ID returned by NumberFormat::getStaticClassID().
     * @return The class ID for all objects of this class.
     * @stable ICU 2.0
     */
    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 2.0
 */
 virtual UClassID getDynamicClassID(void) const override = 0;

protected:

/**
     * Default constructor for subclass use only.
     * @stable ICU 2.0
     */
    NumberFormat();

/**
     * Copy constructor.
     * @stable ICU 2.0
     */
    NumberFormat(const NumberFormat&);

/**
     * Assignment operator.
     * @stable ICU 2.0
     */
    NumberFormat& operator=(const NumberFormat&);

/**
     * Returns the currency in effect for this formatter.  Subclasses
     * should override this method as needed.  Unlike getCurrency(),
     * this method should never return "".
     * @result output parameter for null-terminated result, which must
     * have a capacity of at least 4
     * @internal
     */
    virtual void getEffectiveCurrency(char16_t* result, UErrorCode& ec) const;

#ifndef U_HIDE_INTERNAL_API
    /**
     * Creates the specified number format style of the desired locale.
     * If mustBeDecimalFormat is true, then the returned pointer is
     * either a DecimalFormat or it is NULL.
     * @internal
     */
    static NumberFormat* makeInstance(const Locale& desiredLocale,
                                      UNumberFormatStyle style,
                                      UBool mustBeDecimalFormat,
                                      UErrorCode& errorCode);
#endif  /* U_HIDE_INTERNAL_API */

private:

static UBool isStyleSupported(UNumberFormatStyle style);

/**
     * Creates the specified decimal format style of the desired locale.
     * @param desiredLocale    the given locale.
     * @param style            the given style.
     * @param errorCode        Output param filled with success/failure status.
     * @return                 A new NumberFormat instance.
     */
    static NumberFormat* makeInstance(const Locale& desiredLocale,
                                      UNumberFormatStyle style,
                                      UErrorCode& errorCode);

UBool       fGroupingUsed;
    int32_t     fMaxIntegerDigits;
    int32_t     fMinIntegerDigits;
    int32_t     fMaxFractionDigits;
    int32_t     fMinFractionDigits;

protected:
    /** \internal */
    static const int32_t gDefaultMaxIntegerDigits;
    /** \internal */
    static const int32_t gDefaultMinIntegerDigits;

private:
    UBool      fParseIntegerOnly;
    UBool      fLenient; // true => lenient parse is enabled

// ISO currency code
    char16_t      fCurrency[4];

UDisplayContext fCapitalizationContext;

friend class ICUNumberFormatFactory; // access to makeInstance
    friend class ICUNumberFormatService;
    friend class ::NumberFormatTest;  // access to isStyleSupported()
};

#if !UCONFIG_NO_SERVICE
/**
 * A NumberFormatFactory is used to register new number formats.  The factory
 * should be able to create any of the predefined formats for each locale it
 * supports.  When registered, the locales it supports extend or override the
 * locale already supported by ICU.
 *
 * @stable ICU 2.6
 */
class U_I18N_API NumberFormatFactory : public UObject {
public:

/**
     * Destructor
     * @stable ICU 3.0
     */
    virtual ~NumberFormatFactory();

/**
     * Return true if this factory will be visible.  Default is true.
     * If not visible, the locales supported by this factory will not
     * be listed by getAvailableLocales.
     * @stable ICU 2.6
     */
    virtual UBool visible(void) const = 0;

/**
     * Return the locale names directly supported by this factory.  The number of names
     * is returned in count;
     * @stable ICU 2.6
     */
    virtual const UnicodeString * getSupportedIDs(int32_t &count, UErrorCode& status) const = 0;

/**
     * Return a number format of the appropriate type.  If the locale
     * is not supported, return null.  If the locale is supported, but
     * the type is not provided by this service, return null.  Otherwise
     * return an appropriate instance of NumberFormat.
     * @stable ICU 2.6
     */
    virtual NumberFormat* createFormat(const Locale& loc, UNumberFormatStyle formatType) = 0;
};

/**
 * A NumberFormatFactory that supports a single locale.  It can be visible or invisible.
 * @stable ICU 2.6
 */
class U_I18N_API SimpleNumberFormatFactory : public NumberFormatFactory {
protected:
    /**
     * True if the locale supported by this factory is visible.
     * @stable ICU 2.6
     */
    const UBool _visible;

/**
     * The locale supported by this factory, as a UnicodeString.
     * @stable ICU 2.6
     */
    UnicodeString _id;

public:
    /**
     * @stable ICU 2.6
     */
    SimpleNumberFormatFactory(const Locale& locale, UBool visible = true);

/**
     * @stable ICU 3.0
     */
    virtual ~SimpleNumberFormatFactory();

/**
     * @stable ICU 2.6
     */
    virtual UBool visible(void) const override;

/**
     * @stable ICU 2.6
     */
    virtual const UnicodeString * getSupportedIDs(int32_t &count, UErrorCode& status) const override;
};
#endif /* #if !UCONFIG_NO_SERVICE */

// -------------------------------------

inline UBool
NumberFormat::isParseIntegerOnly() const
{
    return fParseIntegerOnly;
}

inline UBool
NumberFormat::isLenient() const
{
    return fLenient;
}

U_NAMESPACE_END

#endif /* #if !UCONFIG_NO_FORMATTING */

#endif /* U_SHOW_CPLUSPLUS_API */

#endif // _NUMFMT
//eof

cmd: