icu::message2::Formattable Class Reference

The `Formattable` class represents a typed value that can be formatted, originating either from a message argument or a literal in the code. More...

`#include <messageformat2_formattable.h>`

Inheritance diagram for icu::message2::Formattable:

## Public Member Functions

U_I18N_API UFormattableType | getType () const
| Gets the data type of this Formattable object. More...
U_I18N_API double | getDouble (UErrorCode &status) const
| Gets the double value of this object. More...
U_I18N_API int32_t | getLong (UErrorCode &status) const
| Gets the long value of this object. More...
U_I18N_API int64_t | getInt64Value (UErrorCode &status) const
| Gets the int64 value of this object. More...
U_I18N_API int64_t | getInt64 (UErrorCode &status) const
| Gets the int64 value of this object. More...
U_I18N_API const UnicodeString & | getString (UErrorCode &status) const
| Gets the string value of this object. More...
U_I18N_API const DateInfo * | getDate (UErrorCode &status) const
| Gets the struct representing the date value of this object. More...
U_I18N_API UBool | isNumeric () const
| Returns true if the data type of this Formattable object is kDouble. More...
U_I18N_API const Formattable * | getArray (int32_t &count, UErrorCode &status) const
| Gets the array value and count of this object. More...
U_I18N_API const FormattableObject * | getObject (UErrorCode &status) const
| Returns a pointer to the FormattableObject contained within this formattable, or if this object does not contain a FormattableObject, returns nullptr and sets the error code. More...
U_I18N_API | Formattable (const Formattable &)
| Copy constructor. More...
U_I18N_API Formattable & | operator= (Formattable) noexcept
| Assignment operator. More...
U_I18N_API | Formattable ()
| Default constructor. More...
U_I18N_API | Formattable (const UnicodeString &s)
| String constructor. More...
U_I18N_API | Formattable (double d)
| Double constructor. More...
U_I18N_API | Formattable (int64_t i)
| Int64 constructor. More...
U_I18N_API | Formattable (DateInfo &&d)
| Date constructor. More...
U_I18N_API | Formattable (const Formattable *arr, int32_t len)
| Array constructor. More...
U_I18N_API | Formattable (const FormattableObject *obj)
| Object constructor. More...
virtual U_I18N_API | ~Formattable ()
| Destructor. More...
U_I18N_API icu::Formattable | asICUFormattable (UErrorCode &status) const
| Converts the Formattable object to an ICU Formattable object. More...
Public Member Functions inherited from icu::UObject
virtual | ~UObject ()
| Destructor. More...
virtual UClassID | getDynamicClassID () const
| ICU4C "poor man's RTTI", returns a UClassID for the actual ICU class. More...

## Static Public Member Functions

static U_I18N_API Formattable | forDecimal (std::string_view number, UErrorCode &status)
| Creates a Formattable object of an appropriate numeric type from a a decimal number in string form. More...

## Friends

U_I18N_API friend void | swap (Formattable &f1, Formattable &f2) noexcept
| Non-member swap function. More...

## Detailed Description

The `Formattable` class represents a typed value that can be formatted, originating either from a message argument or a literal in the code.

ICU's Formattable class is not used in MessageFormat 2 because it's unsafe to copy an icu::Formattable value that contains an object. (See ICU-20275).

`Formattable` is immutable (not deeply immutable) and is movable and copyable. (Copying does not do a deep copy when the wrapped value is an array or object. Likewise, while a pointer to a wrapped array or object is `const`, the referents of the pointers may be mutated by other code.)

Internal:
  Do not use. This API is for internal use only. ICU 75 technology preview

Deprecated:
  This API is for technology preview only.

Definition at line 113 of file messageformat2_formattable.h.

## Constructor & Destructor Documentation

## Formattable() [1/8]

U_I18N_API icu::message2::Formattable::Formattable | ( | const Formattable & |  | ) |

Copy constructor.

Internal:
  Do not use. This API is for internal use only. ICU 75 technology preview

Deprecated:
  This API is for technology preview only.

## Formattable() [2/8]

U_I18N_API icu::message2::Formattable::Formattable | ( |  | ) |

inline

Default constructor.

Leaves the Formattable in a valid but undefined state.

Internal:
  Do not use. This API is for internal use only. ICU 75 technology preview

Deprecated:
  This API is for technology preview only.

Definition at line 323 of file messageformat2_formattable.h.

## Formattable() [3/8]

U_I18N_API icu::message2::Formattable::Formattable | ( | const UnicodeString & | s | ) |

inline

String constructor.

Parameters

  s | A string to wrap as a Formattable.

Internal:
  Do not use. This API is for internal use only. ICU 75 technology preview

Deprecated:
  This API is for technology preview only.

Definition at line 332 of file messageformat2_formattable.h.

## Formattable() [4/8]

U_I18N_API icu::message2::Formattable::Formattable | ( | double | d | ) |

inline

Double constructor.

Parameters

  d | A double value to wrap as a Formattable.

Internal:
  Do not use. This API is for internal use only. ICU 75 technology preview

Deprecated:
  This API is for technology preview only.

Definition at line 341 of file messageformat2_formattable.h.

## Formattable() [5/8]

U_I18N_API icu::message2::Formattable::Formattable | ( | int64_t | i | ) |

inline

Int64 constructor.

Parameters

  i | An int64 value to wrap as a Formattable.

Internal:
  Do not use. This API is for internal use only. ICU 75 technology preview

Deprecated:
  This API is for technology preview only.

Definition at line 350 of file messageformat2_formattable.h.

## Formattable() [6/8]

U_I18N_API icu::message2::Formattable::Formattable | ( | DateInfo && | d | ) |

inline

Date constructor.

Parameters

  d | A DateInfo struct representing a date, to wrap as a Formattable. Passed by move

Internal:
  Do not use. This API is for internal use only. ICU 75 technology preview

Deprecated:
  This API is for technology preview only.

Definition at line 360 of file messageformat2_formattable.h.

## Formattable() [7/8]

U_I18N_API icu::message2::Formattable::Formattable | ( | const Formattable * | arr,
|  | int32_t | len
| ) |  |

inline

Array constructor.

Parameters

  arr | An array of Formattables, which is adopted.
  len | The length of the array.

Internal:
  Do not use. This API is for internal use only. ICU 75 technology preview

Deprecated:
  This API is for technology preview only.

Definition at line 385 of file messageformat2_formattable.h.

## Formattable() [8/8]

U_I18N_API icu::message2::Formattable::Formattable | ( | const FormattableObject * | obj | ) |

inline

Object constructor.

Parameters

  obj | A FormattableObject (not adopted).

Internal:
  Do not use. This API is for internal use only. ICU 75 technology preview

Deprecated:
  This API is for technology preview only.

Definition at line 394 of file messageformat2_formattable.h.

## ~Formattable()

virtual U_I18N_API icu::message2::Formattable::~Formattable | ( |  | ) |

virtual

Destructor.

Internal:
  Do not use. This API is for internal use only. ICU 75 technology preview

Deprecated:
  This API is for technology preview only.

## Member Function Documentation

## asICUFormattable()

U_I18N_API icu::Formattable icu::message2::Formattable::asICUFormattable | ( | UErrorCode & | status | ) | const

Converts the Formattable object to an ICU Formattable object.

If this has type UFMT_OBJECT or kArray, then `status` is set to U_ILLEGAL_ARGUMENT_ERROR.

Parameters

  status | Input/output error code.

Returns
  An icu::Formattable value with the same value as this.

Internal:
  Do not use. This API is for internal use only. ICU 75 technology preview

Deprecated:
  This API is for technology preview only.

## forDecimal()

static U_I18N_API Formattable icu::message2::Formattable::forDecimal | ( | std::string_view | number,
|  | UErrorCode & | status
| ) |  |

static

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.

Parameters

  number | the unformatted (not localized) string representation of the Decimal number.
  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.

Internal:
  Do not use. This API is for internal use only. ICU 75 technology preview

Deprecated:
  This API is for technology preview only.

## getArray()

U_I18N_API const Formattable* icu::message2::Formattable::getArray | ( | int32_t & | count,
|  | UErrorCode & | status
| ) |  | const

Gets the array value and count of this object.

If this object is not of type kArray then the result is undefined and the error code is set.

Parameters

  count | fill-in with the count of this object.
  status | Input/output error code.

Returns
  the array value of this object.

Internal:
  Do not use. This API is for internal use only. ICU 75 technology preview

Deprecated:
  This API is for technology preview only.

## getDate()

U_I18N_API const DateInfo* icu::message2::Formattable::getDate | ( | UErrorCode & | status | ) | const

inline

Gets the struct representing the date value of this object.

If this object is not of type kDate then the result is undefined and the error code is set.

Parameters

  status | Input/output error code.

Returns
  A non-owned pointer to a DateInfo object representing the underlying date of this object.

Internal:
  Do not use. This API is for internal use only. ICU 75 technology preview

Deprecated:
  This API is for technology preview only.

Definition at line 236 of file messageformat2_formattable.h.

References U_ILLEGAL_ARGUMENT_ERROR, and U_SUCCESS.

## getDouble()

U_I18N_API double icu::message2::Formattable::getDouble | ( | UErrorCode & | status | ) | const

inline

Gets the double value of this object.

If this object is not of type UFMT_DOUBLE, then the result is undefined and the error code is set.

Parameters

  status | Input/output error code.

Returns
  the double value of this object.

Internal:
  Do not use. This API is for internal use only. ICU 75 technology preview

Deprecated:
  This API is for technology preview only.

Definition at line 133 of file messageformat2_formattable.h.

References U_ILLEGAL_ARGUMENT_ERROR, U_SUCCESS, and UFMT_DOUBLE.

## getInt64()

U_I18N_API int64_t icu::message2::Formattable::getInt64 | ( | UErrorCode & | status | ) | const

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 performed, with truncation of any fractional part. If this object is not a numeric type, then 0 is returned and the status is set to U_INVALID_FORMAT_ERROR.

Parameters

  status | the error code

Returns
  the int64 value of this object.

Internal:
  Do not use. This API is for internal use only. ICU 75 technology preview

Deprecated:
  This API is for technology preview only.

## getInt64Value()

U_I18N_API int64_t icu::message2::Formattable::getInt64Value | ( | UErrorCode & | status | ) | const

inline

Gets the int64 value of this object.

If this object is not of type kInt64 then the result is undefined and the error code is set. If conversion to int64 is desired, call getInt64()

Parameters

  status | Input/output error code.

Returns
  the int64 value of this object.

Internal:
  Do not use. This API is for internal use only. ICU 75 technology preview

Deprecated:
  This API is for technology preview only.

Definition at line 178 of file messageformat2_formattable.h.

References U_ILLEGAL_ARGUMENT_ERROR, U_SUCCESS, and UFMT_INT64.

## getLong()

U_I18N_API int32_t icu::message2::Formattable::getLong | ( | UErrorCode & | status | ) | const

inline

Gets the long value of this object.

If this object is not of type UFMT_LONG then the result is undefined and the error code is set.

Parameters

  status | Input/output error code.

Returns
  the long value of this object.

Internal:
  Do not use. This API is for internal use only. ICU 75 technology preview

Deprecated:
  This API is for technology preview only.

Definition at line 155 of file messageformat2_formattable.h.

References U_ILLEGAL_ARGUMENT_ERROR, U_SUCCESS, and UFMT_LONG.

## getObject()

U_I18N_API const FormattableObject* icu::message2::Formattable::getObject | ( | UErrorCode & | status | ) | const

inline

Returns a pointer to the FormattableObject contained within this formattable, or if this object does not contain a FormattableObject, returns nullptr and sets the error code.

Parameters

  status | Input/output error code.

Returns
  a FormattableObject pointer, or nullptr

Internal:
  Do not use. This API is for internal use only. ICU 75 technology preview

Deprecated:
  This API is for technology preview only.

Definition at line 277 of file messageformat2_formattable.h.

References U_ILLEGAL_ARGUMENT_ERROR, U_SUCCESS, and UFMT_OBJECT.

## getString()

U_I18N_API const UnicodeString& icu::message2::Formattable::getString | ( | UErrorCode & | status | ) | const

inline

Gets the string value of this object.

If this object is not of type kString then the result is undefined and the error code is set.

Parameters

  status | Input/output error code.

Returns
  A reference to the string value of this object.

Internal:
  Do not use. This API is for internal use only. ICU 75 technology preview

Deprecated:
  This API is for technology preview only.

Definition at line 215 of file messageformat2_formattable.h.

References U_ILLEGAL_ARGUMENT_ERROR, and U_SUCCESS.

## getType()

U_I18N_API UFormattableType icu::message2::Formattable::getType | ( |  | ) | const

Gets the data type of this Formattable object.

Returns
  the data type of this Formattable object.

Internal:
  Do not use. This API is for internal use only. ICU 75 technology preview

Deprecated:
  This API is for technology preview only.

## isNumeric()

U_I18N_API UBool icu::message2::Formattable::isNumeric | ( |  | ) | const

inline

Returns true if the data type of this Formattable object is kDouble.

Returns
  true if this is a pure numeric object

Internal:
  Do not use. This API is for internal use only. ICU 75 technology preview

Deprecated:
  This API is for technology preview only.

Definition at line 253 of file messageformat2_formattable.h.

References UFMT_DOUBLE, UFMT_INT64, and UFMT_LONG.

## operator=()

U_I18N_API Formattable& icu::message2::Formattable::operator= | ( | Formattable |  | ) |

noexcept

Assignment operator.

Internal:
  Do not use. This API is for internal use only. ICU 75 technology preview

Deprecated:
  This API is for technology preview only.

## Friends And Related Function Documentation

## swap

U_I18N_API friend void swap | ( | Formattable & | f1,
|  | Formattable & | f2
| ) |  |

friend

Non-member swap function.

Parameters

  f1 | will get f2's contents
  f2 | will get f1's contents

Internal:
  Do not use. This API is for internal use only. ICU 75 technology preview

Deprecated:
  This API is for technology preview only.

Definition at line 297 of file messageformat2_formattable.h.

The documentation for this class was generated from the following file:

- i18n/unicode/messageformat2_formattable.h