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Edit File : fmtable.h \| Size : 24.42 KB
// © 2016 and later: Unicode, Inc. and others. // License & terms of use: http://www.unicode.org/copyright.html /* ******************************************************************************** * Copyright (C) 1997-2014, International Business Machines * Corporation and others. All Rights Reserved. ******************************************************************************** * * File FMTABLE.H * * Modification History: * * Date Name Description * 02/29/97 aliu Creation. ******************************************************************************** / #ifndef FMTABLE_H #define FMTABLE_H #include "unicode/utypes.h" #if U_SHOW_CPLUSPLUS_API /* * \file * \brief C++ API: Formattable is a thin wrapper for primitive types used for formatting and parsing / #if !UCONFIG_NO_FORMATTING #include "unicode/unistr.h" #include "unicode/stringpiece.h" #include "unicode/uformattable.h" U_NAMESPACE_BEGIN class CharString; namespace number { namespace impl { class DecimalQuantity; } } /* * Formattable objects can be passed to the Format class or * its subclasses for formatting. Formattable is a thin wrapper * class which interconverts between the primitive numeric types * (double, long, etc.) as well as UDate and UnicodeString. * * <p>Internally, a Formattable object is a union of primitive types. * As such, it can only store one flavor of data at a time. To * determine what flavor of data it contains, use the getType method. * * <p>As of ICU 3.0, Formattable may also wrap a UObject pointer, * which it owns. This allows an instance of any ICU class to be * encapsulated in a Formattable. For legacy reasons and for * efficiency, primitive numeric types are still stored directly * within a Formattable. * * <p>The Formattable class is not suitable for subclassing. * * <p>See UFormattable for a C wrapper. / class U_I18N_API Formattable : public UObject { public: /* * This enum is only used to let callers distinguish between * the Formattable(UDate) constructor and the Formattable(double) * constructor; the compiler cannot distinguish the signatures, * since UDate is currently typedefed to be either double or long. * If UDate is changed later to be a bonafide class * or struct, then we no longer need this enum. * @stable ICU 2.4 / enum ISDATE { kIsDate }; /* * Default constructor * @stable ICU 2.4 / Formattable(); // Type kLong, value 0 /* * Creates a Formattable object with a UDate instance. * @param d the UDate instance. * @param flag the flag to indicate this is a date. Always set it to kIsDate * @stable ICU 2.0 / Formattable(UDate d, ISDATE flag); /* * Creates a Formattable object with a double number. * @param d the double number. * @stable ICU 2.0 / Formattable(double d); /* * Creates a Formattable object with a long number. * @param l the long number. * @stable ICU 2.0 / Formattable(int32_t l); /* * Creates a Formattable object with an int64_t number * @param ll the int64_t number. * @stable ICU 2.8 / Formattable(int64_t ll); #if !UCONFIG_NO_CONVERSION /* * Creates a Formattable object with a char string pointer. * Assumes that the char string is null terminated. * @param strToCopy the char string. * @stable ICU 2.0 / Formattable(const char strToCopy); #endif /** * Creates a Formattable object of an appropriate numeric type from a * a decimal number in string form. The Formattable will retain the * full precision of the input in decimal format, even when it exceeds * what can be represented by a double or int64_t. * * @param number the unformatted (not localized) string representation * of the Decimal number. * @param status the error code. Possible errors include U_INVALID_FORMAT_ERROR * if the format of the string does not conform to that of a * decimal number. * @stable ICU 4.4 / Formattable(StringPiece number, UErrorCode &status); /* * Creates a Formattable object with a UnicodeString object to copy from. * @param strToCopy the UnicodeString string. * @stable ICU 2.0 / Formattable(const UnicodeString& strToCopy); /* * Creates a Formattable object with a UnicodeString object to adopt from. * @param strToAdopt the UnicodeString string. * @stable ICU 2.0 / Formattable(UnicodeString strToAdopt); /** * Creates a Formattable object with an array of Formattable objects. * @param arrayToCopy the Formattable object array. * @param count the array count. * @stable ICU 2.0 / Formattable(const Formattable arrayToCopy, int32_t count); /** * Creates a Formattable object that adopts the given UObject. * @param objectToAdopt the UObject to set this object to * @stable ICU 3.0 / Formattable(UObject objectToAdopt); /** * Copy constructor. * @stable ICU 2.0 / Formattable(const Formattable&); /* * Assignment operator. * @param rhs The Formattable object to copy into this object. * @stable ICU 2.0 / Formattable& operator=(const Formattable &rhs); /* * Equality comparison. * @param other the object to be compared with. * @return TRUE if other are equal to this, FALSE otherwise. * @stable ICU 2.0 / UBool operator==(const Formattable &other) const; /* * Equality operator. * @param other the object to be compared with. * @return TRUE if other are unequal to this, FALSE otherwise. * @stable ICU 2.0 / UBool operator!=(const Formattable& other) const { return !operator==(other); } /* * Destructor. * @stable ICU 2.0 / virtual ~Formattable(); /* * Clone this object. * Clones can be used concurrently in multiple threads. * If an error occurs, then NULL is returned. * The caller must delete the clone. * * @return a clone of this object * * @see getDynamicClassID * @stable ICU 2.8 / Formattable clone() const; /** * Selector for flavor of data type contained within a * Formattable object. Formattable is a union of several * different types, and at any time contains exactly one type. * @stable ICU 2.4 / enum Type { /* * Selector indicating a UDate value. Use getDate to retrieve * the value. * @stable ICU 2.4 / kDate, /* * Selector indicating a double value. Use getDouble to * retrieve the value. * @stable ICU 2.4 / kDouble, /* * Selector indicating a 32-bit integer value. Use getLong to * retrieve the value. * @stable ICU 2.4 / kLong, /* * Selector indicating a UnicodeString value. Use getString * to retrieve the value. * @stable ICU 2.4 / kString, /* * Selector indicating an array of Formattables. Use getArray * to retrieve the value. * @stable ICU 2.4 / kArray, /* * Selector indicating a 64-bit integer value. Use getInt64 * to retrieve the value. * @stable ICU 2.8 / kInt64, /* * Selector indicating a UObject value. Use getObject to * retrieve the value. * @stable ICU 3.0 / kObject }; /* * Gets the data type of this Formattable object. * @return the data type of this Formattable object. * @stable ICU 2.0 / Type getType(void) const; /* * Returns TRUE if the data type of this Formattable object * is kDouble, kLong, or kInt64 * @return TRUE if this is a pure numeric object * @stable ICU 3.0 / UBool isNumeric() const; /* * Gets the double value of this object. If this object is not of type * kDouble then the result is undefined. * @return the double value of this object. * @stable ICU 2.0 / double getDouble(void) const { return fValue.fDouble; } /* * Gets the double value of this object. If this object is of type * long, int64 or Decimal Number then a conversion is peformed, with * possible loss of precision. If the type is kObject and the * object is a Measure, then the result of * getNumber().getDouble(status) is returned. If this object is * neither a numeric type nor a Measure, then 0 is returned and * the status is set to U_INVALID_FORMAT_ERROR. * @param status the error code * @return the double value of this object. * @stable ICU 3.0 / double getDouble(UErrorCode& status) const; /* * Gets the long value of this object. If this object is not of type * kLong then the result is undefined. * @return the long value of this object. * @stable ICU 2.0 / int32_t getLong(void) const { return (int32_t)fValue.fInt64; } /* * Gets the long value of this object. If the magnitude is too * large to fit in a long, then the maximum or minimum long value, * as appropriate, is returned and the status is set to * U_INVALID_FORMAT_ERROR. If this object is of type kInt64 and * it fits within a long, then no precision is lost. If it is of * type kDouble, then a conversion is peformed, with * truncation of any fractional part. If the type is kObject and * the object is a Measure, then the result of * getNumber().getLong(status) is returned. If this object is * neither a numeric type nor a Measure, then 0 is returned and * the status is set to U_INVALID_FORMAT_ERROR. * @param status the error code * @return the long value of this object. * @stable ICU 3.0 / int32_t getLong(UErrorCode& status) const; /* * Gets the int64 value of this object. If this object is not of type * kInt64 then the result is undefined. * @return the int64 value of this object. * @stable ICU 2.8 / int64_t getInt64(void) const { return fValue.fInt64; } /* * Gets the int64 value of this object. If this object is of a numeric * type and the magnitude is too large to fit in an int64, then * the maximum or minimum int64 value, as appropriate, is returned * and the status is set to U_INVALID_FORMAT_ERROR. If the * magnitude fits in an int64, then a casting conversion is * peformed, with truncation of any fractional part. If the type * is kObject and the object is a Measure, then the result of * getNumber().getDouble(status) is returned. If this object is * neither a numeric type nor a Measure, then 0 is returned and * the status is set to U_INVALID_FORMAT_ERROR. * @param status the error code * @return the int64 value of this object. * @stable ICU 3.0 / int64_t getInt64(UErrorCode& status) const; /* * Gets the Date value of this object. If this object is not of type * kDate then the result is undefined. * @return the Date value of this object. * @stable ICU 2.0 / UDate getDate() const { return fValue.fDate; } /* * Gets the Date value of this object. If the type is not a date, * status is set to U_INVALID_FORMAT_ERROR and the return value is * undefined. * @param status the error code. * @return the Date value of this object. * @stable ICU 3.0 / UDate getDate(UErrorCode& status) const; /* * Gets the string value of this object. If this object is not of type * kString then the result is undefined. * @param result Output param to receive the Date value of this object. * @return A reference to 'result'. * @stable ICU 2.0 / UnicodeString& getString(UnicodeString& result) const { result=fValue.fString; return result; } /** * Gets the string value of this object. If the type is not a * string, status is set to U_INVALID_FORMAT_ERROR and a bogus * string is returned. * @param result Output param to receive the Date value of this object. * @param status the error code. * @return A reference to 'result'. * @stable ICU 3.0 / UnicodeString& getString(UnicodeString& result, UErrorCode& status) const; /* * Gets a const reference to the string value of this object. If * this object is not of type kString then the result is * undefined. * @return a const reference to the string value of this object. * @stable ICU 2.0 / inline const UnicodeString& getString(void) const; /* * Gets a const reference to the string value of this object. If * the type is not a string, status is set to * U_INVALID_FORMAT_ERROR and the result is a bogus string. * @param status the error code. * @return a const reference to the string value of this object. * @stable ICU 3.0 / const UnicodeString& getString(UErrorCode& status) const; /* * Gets a reference to the string value of this object. If this * object is not of type kString then the result is undefined. * @return a reference to the string value of this object. * @stable ICU 2.0 / inline UnicodeString& getString(void); /* * Gets a reference to the string value of this object. If the * type is not a string, status is set to U_INVALID_FORMAT_ERROR * and the result is a bogus string. * @param status the error code. * @return a reference to the string value of this object. * @stable ICU 3.0 / UnicodeString& getString(UErrorCode& status); /* * Gets the array value and count of this object. If this object * is not of type kArray then the result is undefined. * @param count fill-in with the count of this object. * @return the array value of this object. * @stable ICU 2.0 / const Formattable getArray(int32_t& count) const { count=fValue.fArrayAndCount.fCount; return fValue.fArrayAndCount.fArray; } /** * Gets the array value and count of this object. If the type is * not an array, status is set to U_INVALID_FORMAT_ERROR, count is * set to 0, and the result is NULL. * @param count fill-in with the count of this object. * @param status the error code. * @return the array value of this object. * @stable ICU 3.0 / const Formattable getArray(int32_t& count, UErrorCode& status) const; /** * Accesses the specified element in the array value of this * Formattable object. If this object is not of type kArray then * the result is undefined. * @param index the specified index. * @return the accessed element in the array. * @stable ICU 2.0 / Formattable& operator[](int32_t index) { return fValue.fArrayAndCount.fArray[index]; } /* * Returns a pointer to the UObject contained within this * formattable, or NULL if this object does not contain a UObject. * @return a UObject pointer, or NULL * @stable ICU 3.0 / const UObject getObject() const; /** * Returns a numeric string representation of the number contained within this * formattable, or NULL if this object does not contain numeric type. * For values obtained by parsing, the returned decimal number retains * the full precision and range of the original input, unconstrained by * the limits of a double floating point or a 64 bit int. * * This function is not thread safe, and therfore is not declared const, * even though it is logically const. * * Possible errors include U_MEMORY_ALLOCATION_ERROR, and * U_INVALID_STATE if the formattable object has not been set to * a numeric type. * * @param status the error code. * @return the unformatted string representation of a number. * @stable ICU 4.4 / StringPiece getDecimalNumber(UErrorCode &status); /* * Sets the double value of this object and changes the type to * kDouble. * @param d the new double value to be set. * @stable ICU 2.0 / void setDouble(double d); /* * Sets the long value of this object and changes the type to * kLong. * @param l the new long value to be set. * @stable ICU 2.0 / void setLong(int32_t l); /* * Sets the int64 value of this object and changes the type to * kInt64. * @param ll the new int64 value to be set. * @stable ICU 2.8 / void setInt64(int64_t ll); /* * Sets the Date value of this object and changes the type to * kDate. * @param d the new Date value to be set. * @stable ICU 2.0 / void setDate(UDate d); /* * Sets the string value of this object and changes the type to * kString. * @param stringToCopy the new string value to be set. * @stable ICU 2.0 / void setString(const UnicodeString& stringToCopy); /* * Sets the array value and count of this object and changes the * type to kArray. * @param array the array value. * @param count the number of array elements to be copied. * @stable ICU 2.0 / void setArray(const Formattable array, int32_t count); /** * Sets and adopts the string value and count of this object and * changes the type to kArray. * @param stringToAdopt the new string value to be adopted. * @stable ICU 2.0 / void adoptString(UnicodeString stringToAdopt); /** * Sets and adopts the array value and count of this object and * changes the type to kArray. * @stable ICU 2.0 / void adoptArray(Formattable array, int32_t count); /** * Sets and adopts the UObject value of this object and changes * the type to kObject. After this call, the caller must not * delete the given object. * @param objectToAdopt the UObject value to be adopted * @stable ICU 3.0 / void adoptObject(UObject objectToAdopt); /** * Sets the the numeric value from a decimal number string, and changes * the type to to a numeric type appropriate for the number. * The syntax of the number is a "numeric string" * as defined in the Decimal Arithmetic Specification, available at * http://speleotrove.com/decimal * The full precision and range of the input number will be retained, * even when it exceeds what can be represented by a double or an int64. * * @param numberString a string representation of the unformatted decimal number. * @param status the error code. Set to U_INVALID_FORMAT_ERROR if the * incoming string is not a valid decimal number. * @stable ICU 4.4 / void setDecimalNumber(StringPiece numberString, UErrorCode &status); /* * ICU "poor man's RTTI", returns a UClassID for the actual class. * * @stable ICU 2.2 / virtual UClassID getDynamicClassID() const; /* * ICU "poor man's RTTI", returns a UClassID for this class. * * @stable ICU 2.2 / static UClassID U_EXPORT2 getStaticClassID(); /* * Convert the UFormattable to a Formattable. Internally, this is a reinterpret_cast. * @param fmt a valid UFormattable * @return the UFormattable as a Formattable object pointer. This is an alias to the original * UFormattable, and so is only valid while the original argument remains in scope. * @stable ICU 52 / static inline Formattable fromUFormattable(UFormattable fmt); /* * Convert the const UFormattable to a const Formattable. Internally, this is a reinterpret_cast. * @param fmt a valid UFormattable * @return the UFormattable as a Formattable object pointer. This is an alias to the original * UFormattable, and so is only valid while the original argument remains in scope. * @stable ICU 52 / static inline const Formattable fromUFormattable(const UFormattable fmt); /* * Convert this object pointer to a UFormattable. * @return this object as a UFormattable pointer. This is an alias to this object, * and so is only valid while this object remains in scope. * @stable ICU 52 / inline UFormattable toUFormattable(); /** * Convert this object pointer to a UFormattable. * @return this object as a UFormattable pointer. This is an alias to this object, * and so is only valid while this object remains in scope. * @stable ICU 52 / inline const UFormattable toUFormattable() const; #ifndef U_HIDE_DEPRECATED_API /** * Deprecated variant of getLong(UErrorCode&). * @param status the error code * @return the long value of this object. * @deprecated ICU 3.0 use getLong(UErrorCode&) instead / inline int32_t getLong(UErrorCode status) const; #endif /* U_HIDE_DEPRECATED_API / #ifndef U_HIDE_INTERNAL_API /* * Internal function, do not use. * TODO: figure out how to make this be non-public. * NumberFormat::format(Formattable, ... * needs to get at the DecimalQuantity, if it exists, for * big decimal formatting. * @internal / number::impl::DecimalQuantity getDecimalQuantity() const { return fDecimalQuantity;} /** * Export the value of this Formattable to a DecimalQuantity. * @internal / void populateDecimalQuantity(number::impl::DecimalQuantity& output, UErrorCode& status) const; /* * Adopt, and set value from, a DecimalQuantity * Internal Function, do not use. * @param dq the DecimalQuantity to be adopted * @internal / void adoptDecimalQuantity(number::impl::DecimalQuantity dq); /** * Internal function to return the CharString pointer. * @param status error code * @return pointer to the CharString - may become invalid if the object is modified * @internal / CharString internalGetCharString(UErrorCode &status); #endif /* U_HIDE_INTERNAL_API / private: /* * Cleans up the memory for unwanted values. For example, the adopted * string or array objects. / void dispose(void); /* * Common initialization, for use by constructors. / void init(); UnicodeString getBogus() const; union { UObject* fObject; UnicodeString* fString; double fDouble; int64_t fInt64; UDate fDate; struct { Formattable* fArray; int32_t fCount; } fArrayAndCount; } fValue; CharString fDecimalStr; number::impl::DecimalQuantity fDecimalQuantity; Type fType; UnicodeString fBogus; // Bogus string when it's needed. }; inline UDate Formattable::getDate(UErrorCode& status) const { if (fType != kDate) { if (U_SUCCESS(status)) { status = U_INVALID_FORMAT_ERROR; } return 0; } return fValue.fDate; } inline const UnicodeString& Formattable::getString(void) const { return fValue.fString; } inline UnicodeString& Formattable::getString(void) { return fValue.fString; } #ifndef U_HIDE_DEPRECATED_API inline int32_t Formattable::getLong(UErrorCode* status) const { return getLong(status); } #endif / U_HIDE_DEPRECATED_API / inline UFormattable Formattable::toUFormattable() { return reinterpret_cast<UFormattable>(this); } inline const UFormattable Formattable::toUFormattable() const { return reinterpret_cast<const UFormattable>(this); } inline Formattable Formattable::fromUFormattable(UFormattable fmt) { return reinterpret_cast<Formattable >(fmt); } inline const Formattable* Formattable::fromUFormattable(const UFormattable fmt) { return reinterpret_cast<const Formattable >(fmt); } U_NAMESPACE_END #endif /* #if !UCONFIG_NO_FORMATTING / #endif / U_SHOW_CPLUSPLUS_API */ #endif //_FMTABLE //eof Back

Edit File : fmtable.h | Size : 24.42 KB

// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
********************************************************************************
*   Copyright (C) 1997-2014, International Business Machines
*   Corporation and others.  All Rights Reserved.
********************************************************************************
*
* File FMTABLE.H
*
* Modification History:
*
*   Date        Name        Description
*   02/29/97    aliu        Creation.
********************************************************************************
*/
#ifndef FMTABLE_H
#define FMTABLE_H

#include "unicode/utypes.h"

#if U_SHOW_CPLUSPLUS_API

/**
 * \file
 * \brief C++ API: Formattable is a thin wrapper for primitive types used for formatting and parsing
 */

#if !UCONFIG_NO_FORMATTING

#include "unicode/unistr.h"
#include "unicode/stringpiece.h"
#include "unicode/uformattable.h"

U_NAMESPACE_BEGIN

class CharString;
namespace number {
namespace impl {
class DecimalQuantity;
}
}

/**
 * Formattable objects can be passed to the Format class or
 * its subclasses for formatting.  Formattable is a thin wrapper
 * class which interconverts between the primitive numeric types
 * (double, long, etc.) as well as UDate and UnicodeString.
 *
 * <p>Internally, a Formattable object is a union of primitive types.
 * As such, it can only store one flavor of data at a time.  To
 * determine what flavor of data it contains, use the getType method.
 *
 * <p>As of ICU 3.0, Formattable may also wrap a UObject pointer,
 * which it owns.  This allows an instance of any ICU class to be
 * encapsulated in a Formattable.  For legacy reasons and for
 * efficiency, primitive numeric types are still stored directly
 * within a Formattable.
 *
 * <p>The Formattable class is not suitable for subclassing.
 *
 * <p>See UFormattable for a C wrapper.
 */
class U_I18N_API Formattable : public UObject {
public:
    /**
     * This enum is only used to let callers distinguish between
     * the Formattable(UDate) constructor and the Formattable(double)
     * constructor; the compiler cannot distinguish the signatures,
     * since UDate is currently typedefed to be either double or long.
     * If UDate is changed later to be a bonafide class
     * or struct, then we no longer need this enum.
     * @stable ICU 2.4
     */
    enum ISDATE { kIsDate };

/**
     * Default constructor
     * @stable ICU 2.4
     */
    Formattable(); // Type kLong, value 0

/**
     * Creates a Formattable object with a UDate instance.
     * @param d the UDate instance.
     * @param flag the flag to indicate this is a date. Always set it to kIsDate
     * @stable ICU 2.0
     */
    Formattable(UDate d, ISDATE flag);

/**
     * Creates a Formattable object with a double number.
     * @param d the double number.
     * @stable ICU 2.0
     */
    Formattable(double d);

/**
     * Creates a Formattable object with a long number.
     * @param l the long number.
     * @stable ICU 2.0
     */
    Formattable(int32_t l);

/**
     * Creates a Formattable object with an int64_t number
     * @param ll the int64_t number.
     * @stable ICU 2.8
     */
    Formattable(int64_t ll);

#if !UCONFIG_NO_CONVERSION
    /**
     * Creates a Formattable object with a char string pointer.
     * Assumes that the char string is null terminated.
     * @param strToCopy the char string.
     * @stable ICU 2.0
     */
    Formattable(const char* strToCopy);
#endif

/**
     * Creates a Formattable object of an appropriate numeric type from a
     * a decimal number in string form.  The Formattable will retain the
     * full precision of the input in decimal format, even when it exceeds
     * what can be represented by a double or int64_t.
     *
     * @param number  the unformatted (not localized) string representation
     *                     of the Decimal number.
     * @param status  the error code.  Possible errors include U_INVALID_FORMAT_ERROR
     *                if the format of the string does not conform to that of a
     *                decimal number.
     * @stable ICU 4.4
     */
    Formattable(StringPiece number, UErrorCode &status);

/**
     * Creates a Formattable object with a UnicodeString object to copy from.
     * @param strToCopy the UnicodeString string.
     * @stable ICU 2.0
     */
    Formattable(const UnicodeString& strToCopy);

/**
     * Creates a Formattable object with a UnicodeString object to adopt from.
     * @param strToAdopt the UnicodeString string.
     * @stable ICU 2.0
     */
    Formattable(UnicodeString* strToAdopt);

/**
     * Creates a Formattable object with an array of Formattable objects.
     * @param arrayToCopy the Formattable object array.
     * @param count the array count.
     * @stable ICU 2.0
     */
    Formattable(const Formattable* arrayToCopy, int32_t count);

/**
     * Creates a Formattable object that adopts the given UObject.
     * @param objectToAdopt the UObject to set this object to
     * @stable ICU 3.0
     */
    Formattable(UObject* objectToAdopt);

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

/**
     * Assignment operator.
     * @param rhs   The Formattable object to copy into this object.
     * @stable ICU 2.0
     */
    Formattable&    operator=(const Formattable &rhs);

/**
     * Equality comparison.
     * @param other    the object to be compared with.
     * @return        TRUE if other are equal to this, FALSE otherwise.
     * @stable ICU 2.0
     */
    UBool          operator==(const Formattable &other) const;

/**
     * Equality operator.
     * @param other    the object to be compared with.
     * @return        TRUE if other are unequal to this, FALSE otherwise.
     * @stable ICU 2.0
     */
    UBool          operator!=(const Formattable& other) const
      { return !operator==(other); }

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

/**
     * Clone this object.
     * Clones can be used concurrently in multiple threads.
     * If an error occurs, then NULL is returned.
     * The caller must delete the clone.
     *
     * @return a clone of this object
     *
     * @see getDynamicClassID
     * @stable ICU 2.8
     */
    Formattable *clone() const;

/**
     * Selector for flavor of data type contained within a
     * Formattable object.  Formattable is a union of several
     * different types, and at any time contains exactly one type.
     * @stable ICU 2.4
     */
    enum Type {
        /**
         * Selector indicating a UDate value.  Use getDate to retrieve
         * the value.
         * @stable ICU 2.4
         */
        kDate,

/**
         * Selector indicating a double value.  Use getDouble to
         * retrieve the value.
         * @stable ICU 2.4
         */
        kDouble,

/**
         * Selector indicating a 32-bit integer value.  Use getLong to
         * retrieve the value.
         * @stable ICU 2.4
         */
        kLong,

/**
         * Selector indicating a UnicodeString value.  Use getString
         * to retrieve the value.
         * @stable ICU 2.4
         */
        kString,

/**
         * Selector indicating an array of Formattables.  Use getArray
         * to retrieve the value.
         * @stable ICU 2.4
         */
        kArray,

/**
         * Selector indicating a 64-bit integer value.  Use getInt64
         * to retrieve the value.
         * @stable ICU 2.8
         */
        kInt64,

/**
         * Selector indicating a UObject value.  Use getObject to
         * retrieve the value.
         * @stable ICU 3.0
         */
        kObject
   };

/**
     * Gets the data type of this Formattable object.
     * @return    the data type of this Formattable object.
     * @stable ICU 2.0
     */
    Type            getType(void) const;

/**
     * Returns TRUE if the data type of this Formattable object
     * is kDouble, kLong, or kInt64
     * @return TRUE if this is a pure numeric object
     * @stable ICU 3.0
     */
    UBool           isNumeric() const;

/**
     * Gets the double value of this object. If this object is not of type
     * kDouble then the result is undefined.
     * @return    the double value of this object.
     * @stable ICU 2.0
     */
    double          getDouble(void) const { return fValue.fDouble; }

/**
     * Gets the double value of this object. If this object is of type
     * long, int64 or Decimal Number then a conversion is peformed, with
     * possible loss of precision.  If the type is kObject and the
     * object is a Measure, then the result of
     * getNumber().getDouble(status) is returned.  If this object is
     * neither a numeric type nor a Measure, then 0 is returned and
     * the status is set to U_INVALID_FORMAT_ERROR.
     * @param status the error code
     * @return the double value of this object.
     * @stable ICU 3.0
     */
    double          getDouble(UErrorCode& status) const;

/**
     * Gets the long value of this object. If this object is not of type
     * kLong then the result is undefined.
     * @return    the long value of this object.
     * @stable ICU 2.0
     */
    int32_t         getLong(void) const { return (int32_t)fValue.fInt64; }

/**
     * Gets the long value of this object. If the magnitude is too
     * large to fit in a long, then the maximum or minimum long value,
     * as appropriate, is returned and the status is set to
     * U_INVALID_FORMAT_ERROR.  If this object is of type kInt64 and
     * it fits within a long, then no precision is lost.  If it is of
     * type kDouble, then a conversion is peformed, with
     * truncation of any fractional part.  If the type is kObject and
     * the object is a Measure, then the result of
     * getNumber().getLong(status) is returned.  If this object is
     * neither a numeric type nor a Measure, then 0 is returned and
     * the status is set to U_INVALID_FORMAT_ERROR.
     * @param status the error code
     * @return    the long value of this object.
     * @stable ICU 3.0
     */
    int32_t         getLong(UErrorCode& status) const;

/**
     * Gets the int64 value of this object. If this object is not of type
     * kInt64 then the result is undefined.
     * @return    the int64 value of this object.
     * @stable ICU 2.8
     */
    int64_t         getInt64(void) const { return fValue.fInt64; }

/**
     * Gets the int64 value of this object. If this object is of a numeric
     * type and the magnitude is too large to fit in an int64, then
     * the maximum or minimum int64 value, as appropriate, is returned
     * and the status is set to U_INVALID_FORMAT_ERROR.  If the
     * magnitude fits in an int64, then a casting conversion is
     * peformed, with truncation of any fractional part.  If the type
     * is kObject and the object is a Measure, then the result of
     * getNumber().getDouble(status) is returned.  If this object is
     * neither a numeric type nor a Measure, then 0 is returned and
     * the status is set to U_INVALID_FORMAT_ERROR.
     * @param status the error code
     * @return    the int64 value of this object.
     * @stable ICU 3.0
     */
    int64_t         getInt64(UErrorCode& status) const;

/**
     * Gets the Date value of this object. If this object is not of type
     * kDate then the result is undefined.
     * @return    the Date value of this object.
     * @stable ICU 2.0
     */
    UDate           getDate() const { return fValue.fDate; }

/**
     * Gets the Date value of this object.  If the type is not a date,
     * status is set to U_INVALID_FORMAT_ERROR and the return value is
     * undefined.
     * @param status the error code.
     * @return    the Date value of this object.
     * @stable ICU 3.0
     */
     UDate          getDate(UErrorCode& status) const;

/**
     * Gets the string value of this object. If this object is not of type
     * kString then the result is undefined.
     * @param result    Output param to receive the Date value of this object.
     * @return          A reference to 'result'.
     * @stable ICU 2.0
     */
    UnicodeString&  getString(UnicodeString& result) const
      { result=*fValue.fString; return result; }

/**
     * Gets the string value of this object. If the type is not a
     * string, status is set to U_INVALID_FORMAT_ERROR and a bogus
     * string is returned.
     * @param result    Output param to receive the Date value of this object.
     * @param status    the error code.
     * @return          A reference to 'result'.
     * @stable ICU 3.0
     */
    UnicodeString&  getString(UnicodeString& result, UErrorCode& status) const;

/**
     * Gets a const reference to the string value of this object. If
     * this object is not of type kString then the result is
     * undefined.
     * @return   a const reference to the string value of this object.
     * @stable ICU 2.0
     */
    inline const UnicodeString& getString(void) const;

/**
     * Gets a const reference to the string value of this object.  If
     * the type is not a string, status is set to
     * U_INVALID_FORMAT_ERROR and the result is a bogus string.
     * @param status    the error code.
     * @return   a const reference to the string value of this object.
     * @stable ICU 3.0
     */
    const UnicodeString& getString(UErrorCode& status) const;

/**
     * Gets a reference to the string value of this object. If this
     * object is not of type kString then the result is undefined.
     * @return   a reference to the string value of this object.
     * @stable ICU 2.0
     */
    inline UnicodeString& getString(void);

/**
     * Gets a reference to the string value of this object. If the
     * type is not a string, status is set to U_INVALID_FORMAT_ERROR
     * and the result is a bogus string.
     * @param status    the error code.
     * @return   a reference to the string value of this object.
     * @stable ICU 3.0
     */
    UnicodeString& getString(UErrorCode& status);

/**
     * Gets the array value and count of this object. If this object
     * is not of type kArray then the result is undefined.
     * @param count    fill-in with the count of this object.
     * @return         the array value of this object.
     * @stable ICU 2.0
     */
    const Formattable* getArray(int32_t& count) const
      { count=fValue.fArrayAndCount.fCount; return fValue.fArrayAndCount.fArray; }

/**
     * Gets the array value and count of this object. If the type is
     * not an array, status is set to U_INVALID_FORMAT_ERROR, count is
     * set to 0, and the result is NULL.
     * @param count    fill-in with the count of this object.
     * @param status the error code.
     * @return         the array value of this object.
     * @stable ICU 3.0
     */
    const Formattable* getArray(int32_t& count, UErrorCode& status) const;

/**
     * Accesses the specified element in the array value of this
     * Formattable object. If this object is not of type kArray then
     * the result is undefined.
     * @param index the specified index.
     * @return the accessed element in the array.
     * @stable ICU 2.0
     */
    Formattable&    operator[](int32_t index) { return fValue.fArrayAndCount.fArray[index]; }

/**
     * Returns a pointer to the UObject contained within this
     * formattable, or NULL if this object does not contain a UObject.
     * @return a UObject pointer, or NULL
     * @stable ICU 3.0
     */
    const UObject*  getObject() const;

/**
     * Returns a numeric string representation of the number contained within this
     * formattable, or NULL if this object does not contain numeric type.
     * For values obtained by parsing, the returned decimal number retains
     * the full precision and range of the original input, unconstrained by
     * the limits of a double floating point or a 64 bit int.
     *
     * This function is not thread safe, and therfore is not declared const,
     * even though it is logically const.
     *
     * Possible errors include U_MEMORY_ALLOCATION_ERROR, and
     * U_INVALID_STATE if the formattable object has not been set to
     * a numeric type.
     *
     * @param status the error code.
     * @return the unformatted string representation of a number.
     * @stable ICU 4.4
     */
    StringPiece getDecimalNumber(UErrorCode &status);

/**
     * Sets the double value of this object and changes the type to
     * kDouble.
     * @param d    the new double value to be set.
     * @stable ICU 2.0
     */
    void            setDouble(double d);

/**
     * Sets the long value of this object and changes the type to
     * kLong.
     * @param l    the new long value to be set.
     * @stable ICU 2.0
     */
    void            setLong(int32_t l);

/**
     * Sets the int64 value of this object and changes the type to
     * kInt64.
     * @param ll    the new int64 value to be set.
     * @stable ICU 2.8
     */
    void            setInt64(int64_t ll);

/**
     * Sets the Date value of this object and changes the type to
     * kDate.
     * @param d    the new Date value to be set.
     * @stable ICU 2.0
     */
    void            setDate(UDate d);

/**
     * Sets the string value of this object and changes the type to
     * kString.
     * @param stringToCopy    the new string value to be set.
     * @stable ICU 2.0
     */
    void            setString(const UnicodeString& stringToCopy);

/**
     * Sets the array value and count of this object and changes the
     * type to kArray.
     * @param array    the array value.
     * @param count    the number of array elements to be copied.
     * @stable ICU 2.0
     */
    void            setArray(const Formattable* array, int32_t count);

/**
     * Sets and adopts the string value and count of this object and
     * changes the type to kArray.
     * @param stringToAdopt    the new string value to be adopted.
     * @stable ICU 2.0
     */
    void            adoptString(UnicodeString* stringToAdopt);

/**
     * Sets and adopts the array value and count of this object and
     * changes the type to kArray.
     * @stable ICU 2.0
     */
    void            adoptArray(Formattable* array, int32_t count);

/**
     * Sets and adopts the UObject value of this object and changes
     * the type to kObject.  After this call, the caller must not
     * delete the given object.
     * @param objectToAdopt the UObject value to be adopted
     * @stable ICU 3.0
     */
    void            adoptObject(UObject* objectToAdopt);

/**
     * Sets the the numeric value from a decimal number string, and changes
     * the type to to a numeric type appropriate for the number.
     * The syntax of the number is a "numeric string"
     * as defined in the Decimal Arithmetic Specification, available at
     * http://speleotrove.com/decimal
     * The full precision and range of the input number will be retained,
     * even when it exceeds what can be represented by a double or an int64.
     *
     * @param numberString  a string representation of the unformatted decimal number.
     * @param status        the error code.  Set to U_INVALID_FORMAT_ERROR if the
     *                      incoming string is not a valid decimal number.
     * @stable ICU 4.4
     */
    void             setDecimalNumber(StringPiece numberString,
                                      UErrorCode &status);

/**
     * ICU "poor man's RTTI", returns a UClassID for the actual class.
     *
     * @stable ICU 2.2
     */
    virtual UClassID getDynamicClassID() const;

/**
     * ICU "poor man's RTTI", returns a UClassID for this class.
     *
     * @stable ICU 2.2
     */
    static UClassID U_EXPORT2 getStaticClassID();

/**
     * Convert the UFormattable to a Formattable.  Internally, this is a reinterpret_cast.
     * @param fmt a valid UFormattable
     * @return the UFormattable as a Formattable object pointer.  This is an alias to the original
     * UFormattable, and so is only valid while the original argument remains in scope.
     * @stable ICU 52
     */
    static inline Formattable *fromUFormattable(UFormattable *fmt);

/**
     * Convert the const UFormattable to a const Formattable.  Internally, this is a reinterpret_cast.
     * @param fmt a valid UFormattable
     * @return the UFormattable as a Formattable object pointer.  This is an alias to the original
     * UFormattable, and so is only valid while the original argument remains in scope.
     * @stable ICU 52
     */
    static inline const Formattable *fromUFormattable(const UFormattable *fmt);

/**
     * Convert this object pointer to a UFormattable.
     * @return this object as a UFormattable pointer.   This is an alias to this object,
     * and so is only valid while this object remains in scope.
     * @stable ICU 52
     */
    inline UFormattable *toUFormattable();

#ifndef U_HIDE_DEPRECATED_API
    /**
     * Deprecated variant of getLong(UErrorCode&).
     * @param status the error code
     * @return the long value of this object.
     * @deprecated ICU 3.0 use getLong(UErrorCode&) instead
     */
    inline int32_t getLong(UErrorCode* status) const;
#endif  /* U_HIDE_DEPRECATED_API */

#ifndef U_HIDE_INTERNAL_API
    /**
     * Internal function, do not use.
     * TODO:  figure out how to make this be non-public.
     *        NumberFormat::format(Formattable, ...
     *        needs to get at the DecimalQuantity, if it exists, for
     *        big decimal formatting.
     *  @internal
     */
    number::impl::DecimalQuantity *getDecimalQuantity() const { return fDecimalQuantity;}

/**
     * Export the value of this Formattable to a DecimalQuantity.
     * @internal
     */
    void populateDecimalQuantity(number::impl::DecimalQuantity& output, UErrorCode& status) const;

/**
     *  Adopt, and set value from, a DecimalQuantity
     *     Internal Function, do not use.
     *  @param dq the DecimalQuantity to be adopted
     *  @internal
     */
    void adoptDecimalQuantity(number::impl::DecimalQuantity *dq);

/**
     * Internal function to return the CharString pointer.
     * @param status error code
     * @return pointer to the CharString - may become invalid if the object is modified
     * @internal
     */
    CharString *internalGetCharString(UErrorCode &status);

#endif  /* U_HIDE_INTERNAL_API */

private:
    /**
     * Cleans up the memory for unwanted values.  For example, the adopted
     * string or array objects.
     */
    void            dispose(void);

/**
     * Common initialization, for use by constructors.
     */
    void            init();

UnicodeString* getBogus() const;

union {
        UObject*        fObject;
        UnicodeString*  fString;
        double          fDouble;
        int64_t         fInt64;
        UDate           fDate;
        struct {
          Formattable*  fArray;
          int32_t       fCount;
        }               fArrayAndCount;
    } fValue;

CharString           *fDecimalStr;

number::impl::DecimalQuantity *fDecimalQuantity;

Type                fType;
    UnicodeString       fBogus; // Bogus string when it's needed.
};

inline UDate Formattable::getDate(UErrorCode& status) const {
    if (fType != kDate) {
        if (U_SUCCESS(status)) {
            status = U_INVALID_FORMAT_ERROR;
        }
        return 0;
    }
    return fValue.fDate;
}

inline const UnicodeString& Formattable::getString(void) const {
    return *fValue.fString;
}

inline UnicodeString& Formattable::getString(void) {
    return *fValue.fString;
}

#ifndef U_HIDE_DEPRECATED_API
inline int32_t Formattable::getLong(UErrorCode* status) const {
    return getLong(*status);
}
#endif  /* U_HIDE_DEPRECATED_API */

inline UFormattable* Formattable::toUFormattable() {
  return reinterpret_cast<UFormattable*>(this);
}

inline const UFormattable* Formattable::toUFormattable() const {
  return reinterpret_cast<const UFormattable*>(this);
}

inline Formattable* Formattable::fromUFormattable(UFormattable *fmt) {
  return reinterpret_cast<Formattable *>(fmt);
}

inline const Formattable* Formattable::fromUFormattable(const UFormattable *fmt) {
  return reinterpret_cast<const Formattable *>(fmt);
}

U_NAMESPACE_END

#endif /* #if !UCONFIG_NO_FORMATTING */

#endif /* U_SHOW_CPLUSPLUS_API */

#endif //_FMTABLE
//eof

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