Obtains the sort key for the character sequence[first, last), such that if a sort key compares less than another sort key withoperator<, then the character sequence that produced the first sort key comes before the character sequence that produced the second sort key, in the currently imbued locale's collation order.

For example, when the regex flagstd::regex_constants::collate is set, then the sequence[a-b] would match some characterc1 iftraits.transform("a")<= traits.transform(c1)<= traits.transform("b"). Note that this function takes a character sequence as the argument to accommodate to the ranges defined like[[.ae.]-d].

Standard library specializations ofstd::regex_traits returnstd::use_facet<std::collate<CharT>>(getloc()).transform(str.data(), str.data()+ str.length()) for some temporary stringstr constructed asstring_type str(first, last).

[edit]Parameters

[edit]Return value

The collation key for the character sequence[first, last) in the currently imbued locale.

[edit]Example

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