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ICU 77.1: icu::RuleBasedCollator Class Reference

The RuleBasedCollator class provides the implementation of Collator, using data-driven tables.

The user can create a customized table-based collation.

For more information about the collation service see the User Guide.

Collation service provides correct sorting orders for most locales supported in ICU. If specific data for a locale is not available, the orders eventually falls back to the CLDR root sort order.

Sort ordering may be customized by providing your own set of rules. For more on this subject see the Collation Customization section of the User Guide.

Note, RuleBasedCollator is not to be subclassed.

See also

Collator

Definition at line 115 of file tblcoll.h.

The comparison function compares the character data stored in two different string arrays.

Returns information about whether a string array is less than, greater than or equal to another string array.

Example of use:

.       char16_t ABC[] = {0x41, 0x42, 0x43, 0};  // = "ABC"
.       char16_t abc[] = {0x61, 0x62, 0x63, 0};  // = "abc"
.       UErrorCode status = U_ZERO_ERROR;
.       Collator *myCollation =
.                         Collator::createInstance(Locale::getUS(), status);
.       if (U_FAILURE(status)) return;
.       myCollation->setStrength(Collator::PRIMARY);
.       // result would be Collator::EQUAL ("abc" == "ABC")
.       // (no primary difference between "abc" and "ABC")
.       Collator::EComparisonResult result =
.                             myCollation->compare(abc, 3, ABC, 3);
.       myCollation->setStrength(Collator::TERTIARY);
.       // result would be Collator::LESS ("abc" <<< "ABC")
.       // (with tertiary difference between "abc" and "ABC")
.       result = myCollation->compare(abc, 3, ABC, 3);

Parameters

source the source string array to be compared with. sourceLength the length of the source string array. If this value is equal to -1, the string array is null-terminated. target the string that is to be compared with the source string. targetLength the length of the target string array. If this value is equal to -1, the string array is null-terminated.

Returns

Returns a byte value. GREATER if source is greater than target; EQUAL if source is equal to target; LESS if source is less than target

Deprecated:

ICU 2.6 use the overload with UErrorCode &

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