Performance optimization for case_fold#326

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andreasbuhr wants to merge 1 commit intoboostorg:developfrom

andreasbuhr:case_fold_fast_path

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andreasbuhr commented Mar 31, 2026

There was one call to std::lower_bound for each space, for each parenthesis, for each newline, and for each bracket. This is not required.
See https://www.unicode.org/Public/UCD/latest/ucd/CaseFolding.txt and https://www.fileformat.info/info/charset/UTF-32/list.htm


          Performance optimization for case_fold

a44a3ee

There was one call to std::lower_bound for each space,
for each parenthesis, for each newline, and for each bracket.
This is not required.
See https://www.unicode.org/Public/UCD/latest/ucd/CaseFolding.txt
and https://www.fileformat.info/info/charset/UTF-32/list.htm

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