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# unifilt.h File Reference

C++ API: Unicode Filter. More...

`#include "unicode/unifunct.h"`
`#include "unicode/unimatch.h"`

Go to the source code of this file.

## Data Structures
class | UnicodeFilter
| `UnicodeFilter` defines a protocol for selecting a subset of the full range (U+0000 to U+10FFFF) of Unicode characters. More...
## Defines
#define | U_ETHER ((UChar)0xFFFF)
| U_ETHER is used to represent character values for positions outside a range.

## Detailed Description

C++ API: Unicode Filter.

Definition in file unifilt.h.

## Define Documentation

#define U_ETHER ((UChar)0xFFFF)

U_ETHER is used to represent character values for positions outside a range.

For example, transliterator uses this to represent characters outside the range contextStart..contextLimit-1. This allows explicit matching by rules and UnicodeSets of text outside a defined range.

Stable:
  ICU 3.0

Definition at line 31 of file unifilt.h.