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UCharIterator Struct Reference

C API for code unit iteration. More...

#include <uiter.h>

List of all members.

Public Attributes

const void * context
 (protected) Pointer to string or wrapped object or similar. More...

int32_t length
 (protected) Length of string or similar. More...

int32_t start
 (protected) Start index or similar. More...

int32_t index
 (protected) Current index or similar. More...

int32_t limit
 (protected) Limit index or similar. More...

int32_t reservedField
 (protected) Used by UTF-8 iterators and possibly others. More...

UCharIteratorGetIndexgetIndex
 (public) Returns the current position or the start or limit index of the iteration range. More...

UCharIteratorMovemove
 (public) Moves the current position relative to the start or limit of the iteration range, or relative to the current position itself. More...

UCharIteratorHasNexthasNext
 (public) Check if current and next can still return another code unit. More...

UCharIteratorHasPrevioushasPrevious
 (public) Check if previous can still return another code unit. More...

UCharIteratorCurrentcurrent
 (public) Return the code unit at the current position, or U_SENTINEL if there is none (index is at the limit). More...

UCharIteratorNextnext
 (public) Return the code unit at the current index and increment the index (post-increment, like s[i++]), or return U_SENTINEL if there is none (index is at the limit). More...

UCharIteratorPreviousprevious
 (public) Decrement the index and return the code unit from there (pre-decrement, like s[--i]), or return U_SENTINEL if there is none (index is at the start). More...

UCharIteratorReservedreservedFn
 (public) Reserved for future use. More...

UCharIteratorGetStategetState
 (public) Return the state of the iterator, to be restored later with setState. More...

UCharIteratorSetStatesetState
 (public) Restore the iterator state from the state word from a call to getState. More...


Detailed Description

C API for code unit iteration.

This can be used as a C wrapper around CharacterIterator, Replaceable, or implemented using simple strings, etc.

There are two roles for using UCharIterator:

A "provider" sets the necessary function pointers and controls the "protected" fields of the UCharIterator structure. A "provider" passes a UCharIterator into C APIs that need a UCharIterator as an abstract, flexible string interface.

Implementations of such C APIs are "callers" of UCharIterator functions; they only use the "public" function pointers and never access the "protected" fields directly.

The current and next functions only check the current index against the limit, and previous only checks the current index against the start, to see if the iterator already reached the end of the iteration range.

The assumption - in all iterators - is that the index is moved via the API, which means it won't go out of bounds, or the index is modified by user code that knows enough about the iterator implementation to set valid index values.

UCharIterator functions return code unit values 0..0xffff, or U_SENTINEL if the iteration bounds are reached.

Stable:
ICU 2.1

Definition at line 338 of file uiter.h.


Member Data Documentation

const void* UCharIterator::context
 

(protected) Pointer to string or wrapped object or similar.

Not used by caller.

Stable:
ICU 2.1

Definition at line 344 of file uiter.h.

UCharIteratorCurrent* UCharIterator::current
 

(public) Return the code unit at the current position, or U_SENTINEL if there is none (index is at the limit).

See also:
UCharIteratorCurrent
Stable:
ICU 2.1

Definition at line 424 of file uiter.h.

UCharIteratorGetIndex* UCharIterator::getIndex
 

(public) Returns the current position or the start or limit index of the iteration range.

See also:
UCharIteratorGetIndex
Stable:
ICU 2.1

Definition at line 387 of file uiter.h.

UCharIteratorGetState* UCharIterator::getState
 

(public) Return the state of the iterator, to be restored later with setState.

This function pointer is NULL if the iterator does not implement it.

See also:
UCharIteratorGet
Draft:
This API has been introduced in ICU 2.6. It is still in draft state and may be modified in a future release.

Definition at line 461 of file uiter.h.

UCharIteratorHasNext* UCharIterator::hasNext
 

(public) Check if current and next can still return another code unit.

See also:
UCharIteratorHasNext
Stable:
ICU 2.1

Definition at line 407 of file uiter.h.

UCharIteratorHasPrevious* UCharIterator::hasPrevious
 

(public) Check if previous can still return another code unit.

See also:
UCharIteratorHasPrevious
Stable:
ICU 2.1

Definition at line 415 of file uiter.h.

int32_t UCharIterator::index
 

(protected) Current index or similar.

Not used by caller.

Stable:
ICU 2.1

Definition at line 365 of file uiter.h.

int32_t UCharIterator::length
 

(protected) Length of string or similar.

Not used by caller.

Stable:
ICU 2.1

Definition at line 351 of file uiter.h.

int32_t UCharIterator::limit
 

(protected) Limit index or similar.

Not used by caller.

Stable:
ICU 2.1

Definition at line 372 of file uiter.h.

UCharIteratorMove* UCharIterator::move
 

(public) Moves the current position relative to the start or limit 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.

See also:
UCharIteratorMove
Stable:
ICU 2.1

Definition at line 398 of file uiter.h.

UCharIteratorNext* UCharIterator::next
 

(public) Return the code unit at the current index and increment the index (post-increment, like s[i++]), or return U_SENTINEL if there is none (index is at the limit).

See also:
UCharIteratorNext
Stable:
ICU 2.1

Definition at line 434 of file uiter.h.

UCharIteratorPrevious* UCharIterator::previous
 

(public) Decrement the index and return the code unit from there (pre-decrement, like s[--i]), or return U_SENTINEL if there is none (index is at the start).

See also:
UCharIteratorPrevious
Stable:
ICU 2.1

Definition at line 444 of file uiter.h.

int32_t UCharIterator::reservedField
 

(protected) Used by UTF-8 iterators and possibly others.

Stable:
ICU 2.1

Definition at line 378 of file uiter.h.

UCharIteratorReserved* UCharIterator::reservedFn
 

(public) Reserved for future use.

Currently NULL.

See also:
UCharIteratorReserved
Stable:
ICU 2.1

Definition at line 452 of file uiter.h.

UCharIteratorSetState* UCharIterator::setState
 

(public) Restore the iterator state from the state word from a call to getState.

This function pointer is NULL if the iterator does not implement it.

See also:
UCharIteratorSet
Draft:
This API has been introduced in ICU 2.6. It is still in draft state and may be modified in a future release.

Definition at line 471 of file uiter.h.

int32_t UCharIterator::start
 

(protected) Start index or similar.

Not used by caller.

Stable:
ICU 2.1

Definition at line 358 of file uiter.h.


The documentation for this struct was generated from the following file:
Generated on Mon Nov 24 14:37:00 2003 for ICU 2.8 by doxygen1.2.11.1 written by Dimitri van Heesch, © 1997-2001