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 // © 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
 
 /**
  * <p><strong>IMPORTANT:</strong> 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"
  * <P>
  * 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.
  * <P>
  * 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.
  * <P>
  * 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%.
  * <P>
  * 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".
  * <P>
  * 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 nullptr in case you
  * encounter an unusual one.
  * <P>
  * 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.
  * <P>
  * 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.
  * <P>
  * 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.
  * <p>
  * <em>User subclasses are not supported.</em> 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.
      *
      * <p>
      * 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,
 #ifndef U_HIDE_DRAFT_API
         /**
          * Rounds ties toward the odd number.
          * @draft ICU 73
          */
         kRoundHalfOdd,
         /**
          * Rounds ties toward +∞.
          * @draft ICU 73
          */
         kRoundHalfCeiling,
         /**
          * Rounds ties toward -∞.
          * @draft ICU 73
          */
         kRoundHalfFloor,
 #endif /* U_HIDE_DRAFT_API */
     };
 
     /**
      * 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
      *                  nullptr.
      * @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.
      * <P>
      * 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.
      * <P>
      * When parsing, leading whitespace is discarded (with successful
      * parse), while trailing whitespace is left as is.
      * <P>
      * 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 nullptr
      *                  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 nullptr.
      * @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 nullptr.
      * @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 nullptr.
      * @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 nullptr.
      * @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).
     * <P>
     * If no object can be parsed, index is unchanged, and nullptr is
     * returned.
     * <P>
     * 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 nullptr.
      * @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.
      * <p>
      * <strong>NOTE:</strong> 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.
      * <p>
      * <strong>NOTE:</strong> 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.
      * <p>
      * <strong>NOTE:</strong> 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.
      * <p>
      * <strong>NOTE:</strong> 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.
      * <p>
      * <strong>NOTE:</strong> 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.
      * <p>
      * <strong>NOTE:</strong> 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.
      * <p>
      * <strong>NOTE:</strong> 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.
      * <p>
      * <strong>NOTE:</strong> 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.
      * <p>
      * <strong>NOTE:</strong> 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 nullptr 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.
      * <P>
      * @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 nullptr.
      * @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

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