icu::UCharCharacterIterator Class Reference

A concrete subclass of CharacterIterator that iterates over the characters (code units or code points) in a char16_t array. More...

#include <uchriter.h>

Inheritance diagram for icu::UCharCharacterIterator:

Public Member Functions
	UCharCharacterIterator (ConstChar16Ptr textPtr, int32_t length)
	Create an iterator over the char16_t array referred to by "textPtr".
	UCharCharacterIterator (ConstChar16Ptr textPtr, int32_t length, int32_t position)
	Create an iterator over the char16_t array referred to by "textPtr".
	UCharCharacterIterator (ConstChar16Ptr textPtr, int32_t length, int32_t textBegin, int32_t textEnd, int32_t position)
	Create an iterator over the char16_t array referred to by "textPtr".
	UCharCharacterIterator (const UCharCharacterIterator &that)
	Copy constructor.
virtual	~UCharCharacterIterator ()
	Destructor.
UCharCharacterIterator &	operator= (const UCharCharacterIterator &that)
	Assignment operator.
virtual bool	operator== (const ForwardCharacterIterator &that) const override
	Returns true if the iterators iterate over the same range of the same string and are pointing at the same character.
virtual int32_t	hashCode () const override
	Generates a hash code for this iterator.
virtual UCharCharacterIterator *	clone () const override
	Returns a new UCharCharacterIterator referring to the same character in the same range of the same string as this one.
virtual char16_t	first () override
	Sets the iterator to refer to the first code unit in its iteration range, and returns that code unit.
virtual char16_t	firstPostInc () override
	Sets the iterator to refer to the first code unit in its iteration range, returns that code unit, and moves the position to the second code unit.
virtual UChar32	first32 () override
	Sets the iterator to refer to the first code point in its iteration range, and returns that code unit, This can be used to begin an iteration with next32().
virtual UChar32	first32PostInc () override
	Sets the iterator to refer to the first code point in its iteration range, returns that code point, and moves the position to the second code point.
virtual char16_t	last () override
	Sets the iterator to refer to the last code unit in its iteration range, and returns that code unit.
virtual UChar32	last32 () override
	Sets the iterator to refer to the last code point in its iteration range, and returns that code unit.
virtual char16_t	setIndex (int32_t position) override
	Sets the iterator to refer to the "position"-th code unit in the text-storage object the iterator refers to, and returns that code unit.
virtual UChar32	setIndex32 (int32_t position) override
	Sets the iterator to refer to the beginning of the code point that contains the "position"-th code unit in the text-storage object the iterator refers to, and returns that code point.
virtual char16_t	current () const override
	Returns the code unit the iterator currently refers to.
virtual UChar32	current32 () const override
	Returns the code point the iterator currently refers to.
virtual char16_t	next () override
	Advances to the next code unit in the iteration range (toward endIndex()), and returns that code unit.
virtual char16_t	nextPostInc () override
	Gets the current code unit for returning and advances to the next code unit in the iteration range (toward endIndex()).
virtual UChar32	next32 () override
	Advances to the next code point in the iteration range (toward endIndex()), and returns that code point.
virtual UChar32	next32PostInc () override
	Gets the current code point for returning and advances to the next code point in the iteration range (toward endIndex()).
virtual UBool	hasNext () override
	Returns false if there are no more code units or code points at or after the current position in the iteration range.
virtual char16_t	previous () override
	Advances to the previous code unit in the iteration range (toward startIndex()), and returns that code unit.
virtual UChar32	previous32 () override
	Advances to the previous code point in the iteration range (toward startIndex()), and returns that code point.
virtual UBool	hasPrevious () override
	Returns false if there are no more code units or code points before the current position in the iteration range.
virtual int32_t	move (int32_t delta, EOrigin origin) override
	Moves the current position relative to the start or end of the iteration range, or relative to the current position itself.
virtual int32_t	move32 (int32_t delta, EOrigin origin) override
	Moves the current position relative to the start or end of the iteration range, or relative to the current position itself.
void	setText (ConstChar16Ptr newText, int32_t newTextLength)
	Sets the iterator to iterate over a new range of text.
virtual void	getText (UnicodeString &result) override
	Copies the char16_t array under iteration into the UnicodeString referred to by "result".
virtual UClassID	getDynamicClassID () const override
	Return a class ID for this object (not really public)
Public Member Functions inherited from icu::CharacterIterator
virtual	~CharacterIterator ()
	Destructor.
int32_t	setToStart ()
	Sets the iterator to refer to the first code unit or code point in its iteration range.
int32_t	setToEnd ()
	Sets the iterator to the end of its iteration range, just behind the last code unit or code point.
int32_t	startIndex () const
	Returns the numeric index in the underlying text-storage object of the character returned by first().
int32_t	endIndex () const
	Returns the numeric index in the underlying text-storage object of the position immediately BEYOND the character returned by last().
int32_t	getIndex () const
	Returns the numeric index in the underlying text-storage object of the character the iterator currently refers to (i.e., the character returned by current()).
int32_t	getLength () const
	Returns the length of the entire text in the underlying text-storage object.
Public Member Functions inherited from icu::ForwardCharacterIterator
virtual	~ForwardCharacterIterator ()
	Destructor.
bool	operator!= (const ForwardCharacterIterator &that) const
	Returns true when the iterators refer to different text-storage objects, or to different characters in the same text-storage object.
Public Member Functions inherited from icu::UObject
virtual	~UObject ()
	Destructor.

Static Public Member Functions
static UClassID	getStaticClassID ()
	Return a class ID for this class (not really public)

Protected Member Functions
	UCharCharacterIterator ()
	Protected constructor.
Protected Member Functions inherited from icu::CharacterIterator
	CharacterIterator ()
	Empty constructor.
	CharacterIterator (int32_t length)
	Constructor, just setting the length field in this base class.
	CharacterIterator (int32_t length, int32_t position)
	Constructor, just setting the length and position fields in this base class.
	CharacterIterator (int32_t length, int32_t textBegin, int32_t textEnd, int32_t position)
	Constructor, just setting the length, start, end, and position fields in this base class.
	CharacterIterator (const CharacterIterator &that)
	Copy constructor.
CharacterIterator &	operator= (const CharacterIterator &that)
	Assignment operator.
Protected Member Functions inherited from icu::ForwardCharacterIterator
	ForwardCharacterIterator ()
	Default constructor to be overridden in the implementing class.
	ForwardCharacterIterator (const ForwardCharacterIterator &other)
	Copy constructor to be overridden in the implementing class.
ForwardCharacterIterator &	operator= (const ForwardCharacterIterator &)
	Assignment operator to be overridden in the implementing class.

Protected Attributes
const char16_t *	text
	Protected member text.
Protected Attributes inherited from icu::CharacterIterator
int32_t	textLength
	Base class text length field.
int32_t	pos
	Base class field for the current position.
int32_t	begin
	Base class field for the start of the iteration range.
int32_t	end
	Base class field for the end of the iteration range.

Additional Inherited Members
Public Types inherited from icu::CharacterIterator
enum	EOrigin { kStart , kCurrent , kEnd }
	Origin enumeration for the move() and move32() functions. More...
Public Types inherited from icu::ForwardCharacterIterator
enum	{ DONE = 0xffff }
	Value returned by most of ForwardCharacterIterator's functions when the iterator has reached the limits of its iteration. More...

Detailed Description

A concrete subclass of CharacterIterator that iterates over the characters (code units or code points) in a char16_t array.

It's possible not only to create an iterator that iterates over an entire char16_t array, but also to create one that iterates over only a subrange of a char16_t array (iterators over different subranges of the same char16_t array don't compare equal).

See also

CharacterIterator

ForwardCharacterIterator

Stable:

ICU 2.0

Definition at line 38 of file uchriter.h.

Constructor & Destructor Documentation

UCharCharacterIterator() [1/5]

icu::UCharCharacterIterator::UCharCharacterIterator	(	ConstChar16Ptr	textPtr,
		int32_t	length
	)

Create an iterator over the char16_t array referred to by "textPtr".

The iteration range is 0 to length-1. text is only aliased, not adopted (the destructor will not delete it).

Parameters

textPtr	The char16_t array to be iterated over
length	The length of the char16_t array

Stable:

ICU 2.0

UCharCharacterIterator() [2/5]

icu::UCharCharacterIterator::UCharCharacterIterator	(	ConstChar16Ptr	textPtr,
		int32_t	length,
		int32_t	position
	)

Create an iterator over the char16_t array referred to by "textPtr".

The iteration range is 0 to length-1. text is only aliased, not adopted (the destructor will not delete it). The starting position is specified by "position". If "position" is outside the valid iteration range, the behavior of this object is undefined.

Parameters

textPtr	The char16_t array to be iterated over
length	The length of the char16_t array
position	The starting position of the iteration

Stable:

ICU 2.0

UCharCharacterIterator() [3/5]

icu::UCharCharacterIterator::UCharCharacterIterator	(	ConstChar16Ptr	textPtr,
		int32_t	length,
		int32_t	textBegin,
		int32_t	textEnd,
		int32_t	position
	)

Create an iterator over the char16_t array referred to by "textPtr".

The iteration range is 0 to end-1. text is only aliased, not adopted (the destructor will not delete it). The starting position is specified by "position". If begin and end do not form a valid iteration range or "position" is outside the valid iteration range, the behavior of this object is undefined.

Parameters

textPtr	The char16_t array to be iterated over
length	The length of the char16_t array
textBegin	The begin position of the iteration range
textEnd	The end position of the iteration range
position	The starting position of the iteration

Stable:

ICU 2.0

UCharCharacterIterator() [4/5]

icu::UCharCharacterIterator::UCharCharacterIterator

(

const UCharCharacterIterator &

that

)

Copy constructor.

The new iterator iterates over the same range of the same string as "that", and its initial position is the same as "that"'s current position.

Parameters

that	The UCharCharacterIterator to be copied

Stable:

ICU 2.0

~UCharCharacterIterator()

virtual icu::UCharCharacterIterator::~UCharCharacterIterator ( )

virtual

Destructor.

Stable:

ICU 2.0

UCharCharacterIterator() [5/5]

icu::UCharCharacterIterator::UCharCharacterIterator ( )

protected

Protected constructor.

Stable:

ICU 2.0

Member Function Documentation

clone()

virtual UCharCharacterIterator * icu::UCharCharacterIterator::clone ( ) const

overridevirtual

Returns a new UCharCharacterIterator referring to the same character in the same range of the same string as this one.

The caller must delete the new iterator.

Returns

the CharacterIterator newly created

Stable:

ICU 2.0

Implements icu::CharacterIterator.

Reimplemented in icu::StringCharacterIterator.

current()

virtual char16_t icu::UCharCharacterIterator::current ( ) const

overridevirtual

Returns the code unit the iterator currently refers to.

Returns

the code unit the iterator currently refers to.

Stable:

ICU 2.0

Implements icu::CharacterIterator.

current32()

virtual UChar32 icu::UCharCharacterIterator::current32 ( ) const

overridevirtual

Returns the code point the iterator currently refers to.

Returns

the code point the iterator currently refers to.

Stable:

ICU 2.0

Implements icu::CharacterIterator.

first()

virtual char16_t icu::UCharCharacterIterator::first ( )

overridevirtual

Sets the iterator to refer to the first code unit in its iteration range, and returns that code unit.

This can be used to begin an iteration with next().

Returns

the first code unit in its iteration range.

Stable:

ICU 2.0

Implements icu::CharacterIterator.

first32()

virtual UChar32 icu::UCharCharacterIterator::first32 ( )

overridevirtual

Sets the iterator to refer to the first code point in its iteration range, and returns that code unit, This can be used to begin an iteration with next32().

Note that an iteration with next32PostInc(), beginning with, e.g., setToStart() or firstPostInc(), is more efficient.

Returns

the first code point in its iteration range

Stable:

ICU 2.0

Implements icu::CharacterIterator.

first32PostInc()

virtual UChar32 icu::UCharCharacterIterator::first32PostInc ( )

overridevirtual

Sets the iterator to refer to the first code point in its iteration range, returns that code point, and moves the position to the second code point.

This is an alternative to setToStart() for forward iteration with next32PostInc().

Returns

the first code point in its iteration range.

Stable:

ICU 2.0

Reimplemented from icu::CharacterIterator.

firstPostInc()

virtual char16_t icu::UCharCharacterIterator::firstPostInc ( )

overridevirtual

Sets the iterator to refer to the first code unit in its iteration range, returns that code unit, and moves the position to the second code unit.

This is an alternative to setToStart() for forward iteration with nextPostInc().

Returns

the first code unit in its iteration range

Stable:

ICU 2.0

Reimplemented from icu::CharacterIterator.

getDynamicClassID()

virtual UClassID icu::UCharCharacterIterator::getDynamicClassID ( ) const

overridevirtual

Return a class ID for this object (not really public)

Returns

a class ID for this object.

Stable:

ICU 2.0

Implements icu::ForwardCharacterIterator.

Reimplemented in icu::StringCharacterIterator.

getStaticClassID()

static UClassID icu::UCharCharacterIterator::getStaticClassID ( )

static

Return a class ID for this class (not really public)

Returns

a class ID for this class

Stable:

ICU 2.0

getText()

virtual void icu::UCharCharacterIterator::getText ( UnicodeString &  result )

overridevirtual

Copies the char16_t array under iteration into the UnicodeString referred to by "result".

Even if this iterator iterates across only a part of this string, the whole string is copied.

Parameters

result

Receives a copy of the text under iteration.

Stable:

ICU 2.0

Implements icu::CharacterIterator.

Reimplemented in icu::StringCharacterIterator.

hashCode()

virtual int32_t icu::UCharCharacterIterator::hashCode ( ) const

overridevirtual

Generates a hash code for this iterator.

Returns

the hash code.

Stable:

ICU 2.0

Implements icu::ForwardCharacterIterator.

hasNext()

virtual UBool icu::UCharCharacterIterator::hasNext ( )

overridevirtual

Returns false if there are no more code units or code points at or after the current position in the iteration range.

This is used with nextPostInc() or next32PostInc() in forward iteration.

Returns

false if there are no more code units or code points at or after the current position in the iteration range.

Stable:

ICU 2.0

Implements icu::ForwardCharacterIterator.

hasPrevious()

virtual UBool icu::UCharCharacterIterator::hasPrevious ( )

overridevirtual

Returns false if there are no more code units or code points before the current position in the iteration range.

This is used with previous() or previous32() in backward iteration.

Returns

false if there are no more code units or code points before the current position in the iteration range.

Stable:

ICU 2.0

Implements icu::CharacterIterator.

last()

virtual char16_t icu::UCharCharacterIterator::last ( )

overridevirtual

Sets the iterator to refer to the last code unit in its iteration range, and returns that code unit.

This can be used to begin an iteration with previous().

Returns

the last code unit in its iteration range.

Stable:

ICU 2.0

Implements icu::CharacterIterator.

last32()

virtual UChar32 icu::UCharCharacterIterator::last32 ( )

overridevirtual

Sets the iterator to refer to the last code point in its iteration range, and returns that code unit.

This can be used to begin an iteration with previous32().

Returns

the last code point in its iteration range.

Stable:

ICU 2.0

Implements icu::CharacterIterator.

move()

virtual int32_t icu::UCharCharacterIterator::move ( int32_t  delta, EOrigin  origin  )

overridevirtual

Moves the current position relative to the start or end of the iteration range, or relative to the current position itself.

The movement is expressed in numbers of code units forward or backward by specifying a positive or negative delta.

Parameters

delta	the position relative to origin. A positive delta means forward; a negative delta means backward.
origin	Origin enumeration {kStart, kCurrent, kEnd}

Returns

the new position

Stable:

ICU 2.0

Implements icu::CharacterIterator.

move32()

virtual int32_t icu::UCharCharacterIterator::move32 ( int32_t  delta, EOrigin  origin  )

overridevirtual

Moves the current position relative to the start or end of the iteration range, or relative to the current position itself.

The movement is expressed in numbers of code points forward or backward by specifying a positive or negative delta.

Parameters

delta	the position relative to origin. A positive delta means forward; a negative delta means backward.
origin	Origin enumeration {kStart, kCurrent, kEnd}

Returns

the new position

Stable:

ICU 2.0

Implements icu::CharacterIterator.

next()

virtual char16_t icu::UCharCharacterIterator::next ( )

overridevirtual

Advances to the next code unit in the iteration range (toward endIndex()), and returns that code unit.

If there are no more code units to return, returns DONE.

Returns

the next code unit in the iteration range.

Stable:

ICU 2.0

Implements icu::CharacterIterator.

next32()

virtual UChar32 icu::UCharCharacterIterator::next32 ( )

overridevirtual

Advances to the next code point in the iteration range (toward endIndex()), and returns that code point.

If there are no more code points to return, returns DONE. Note that iteration with "pre-increment" semantics is less efficient than iteration with "post-increment" semantics that is provided by next32PostInc().

Returns

the next code point in the iteration range.

Stable:

ICU 2.0

Implements icu::CharacterIterator.

next32PostInc()

virtual UChar32 icu::UCharCharacterIterator::next32PostInc ( )

overridevirtual

Gets the current code point for returning and advances to the next code point in the iteration range (toward endIndex()).

If there are no more code points to return, returns DONE.

Returns

the current point.

Stable:

ICU 2.0

Implements icu::ForwardCharacterIterator.

nextPostInc()

virtual char16_t icu::UCharCharacterIterator::nextPostInc ( )

overridevirtual

Gets the current code unit for returning and advances to the next code unit in the iteration range (toward endIndex()).

If there are no more code units to return, returns DONE.

Returns

the current code unit.

Stable:

ICU 2.0

Implements icu::ForwardCharacterIterator.

operator=()

UCharCharacterIterator & icu::UCharCharacterIterator::operator=

(

const UCharCharacterIterator &

that

)

Assignment operator.

*this is altered to iterate over the sane range of the same string as "that", and refers to the same character within that string as "that" does.

Parameters

that	The object to be copied

Returns

the newly created object

Stable:

ICU 2.0

operator==()

virtual bool icu::UCharCharacterIterator::operator== ( const ForwardCharacterIterator &  that ) const

overridevirtual

Returns true if the iterators iterate over the same range of the same string and are pointing at the same character.

Parameters

that	The ForwardCharacterIterator used to be compared for equality

Returns

true if the iterators iterate over the same range of the same string and are pointing at the same character.

Stable:

ICU 2.0

Implements icu::ForwardCharacterIterator.

Reimplemented in icu::StringCharacterIterator.

previous()

virtual char16_t icu::UCharCharacterIterator::previous ( )

overridevirtual

Advances to the previous code unit in the iteration range (toward startIndex()), and returns that code unit.

If there are no more code units to return, returns DONE.

Returns

the previous code unit in the iteration range.

Stable:

ICU 2.0

Implements icu::CharacterIterator.

previous32()

virtual UChar32 icu::UCharCharacterIterator::previous32 ( )

overridevirtual

Advances to the previous code point in the iteration range (toward startIndex()), and returns that code point.

If there are no more code points to return, returns DONE.

Returns

the previous code point in the iteration range.

Stable:

ICU 2.0

Implements icu::CharacterIterator.

setIndex()

virtual char16_t icu::UCharCharacterIterator::setIndex ( int32_t  position )

overridevirtual

Sets the iterator to refer to the "position"-th code unit in the text-storage object the iterator refers to, and returns that code unit.

Parameters

position

the position within the text-storage object

Returns

the code unit

Stable:

ICU 2.0

Implements icu::CharacterIterator.

setIndex32()

virtual UChar32 icu::UCharCharacterIterator::setIndex32 ( int32_t  position )

overridevirtual

Sets the iterator to refer to the beginning of the code point that contains the "position"-th code unit in the text-storage object the iterator refers to, and returns that code point.

The current position is adjusted to the beginning of the code point (its first code unit).

Parameters

position

the position within the text-storage object

Returns

the code unit

Stable:

ICU 2.0

Implements icu::CharacterIterator.

setText()

void icu::UCharCharacterIterator::setText	(	ConstChar16Ptr	newText,
		int32_t	newTextLength
	)

Sets the iterator to iterate over a new range of text.

Stable:

ICU 2.0

Field Documentation

text

const char16_t* icu::UCharCharacterIterator::text

protected

Protected member text.

Stable:

ICU 2.0

Definition at line 385 of file uchriter.h.

---

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

• common/unicode/uchriter.h