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
* 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:
*
* 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 <= 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 <= 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
*
* For example, you can align numbers in two ways.
*