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ICU-10033 Clarify what characters numeric collation works on

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X-SVN-Rev: 35274
This commit is contained in:
Markus Scherer 2014-02-28 22:50:10 +00:00
parent b35f99a0a7
commit 3baf728df7
1 changed files with 13 additions and 4 deletions
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17
icu4c/source/i18n/unicode/ucol.h
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@ -309,13 +309,22 @@ typedef enum {
*/ */
UCOL_HIRAGANA_QUATERNARY_MODE = UCOL_STRENGTH + 1, UCOL_HIRAGANA_QUATERNARY_MODE = UCOL_STRENGTH + 1,
#endif /* U_HIDE_DEPRECATED_API */ #endif /* U_HIDE_DEPRECATED_API */
/** When turned on, this attribute generates a collation key /**
* for the numeric value of substrings of digits. * When turned on, this attribute makes
* substrings of digits sort according to their numeric values.
*
* This is a way to get '100' to sort AFTER '2'. Note that the longest * This is a way to get '100' to sort AFTER '2'. Note that the longest
* digit substring that can be treated as a single collation element is * digit substring that can be treated as a single unit is
* 254 digits (not counting leading zeros). If a digit substring is * 254 digits (not counting leading zeros). If a digit substring is
* longer than that, the digits beyond the limit will be treated as a * longer than that, the digits beyond the limit will be treated as a
* separate digit substring associated with a separate collation element. * separate digit substring.
*
* A "digit" in this sense is a code point with General_Category=Nd,
* which does not include circled numbers, roman numerals, etc.
* Only a contiguous digit substring is considered, that is,
* non-negative integers without separators.
* There is no support for plus/minus signs, decimals, exponents, etc.
*
* @stable ICU 2.8 * @stable ICU 2.8
*/ */
UCOL_NUMERIC_COLLATION = UCOL_STRENGTH + 2, UCOL_NUMERIC_COLLATION = UCOL_STRENGTH + 2,