tmp/tmp6h9bn631/{from.md → to.md}
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| 1 |
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### Universal character names <a id="lex.universal.char">[[lex.universal.char]]</a>
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``` bnf
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n-char:
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any member of the translation character set except the U+007d (right curly bracket) or new-line character
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```
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``` bnf
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n-char-sequence:
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n-char n-char-sequenceₒₚₜ
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```
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``` bnf
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named-universal-character:
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'\N{' n-char-sequence '}'
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```
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``` bnf
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hex-quad:
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hexadecimal-digit hexadecimal-digit hexadecimal-digit hexadecimal-digit
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```
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``` bnf
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simple-hexadecimal-digit-sequence:
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hexadecimal-digit simple-hexadecimal-digit-sequenceₒₚₜ
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```
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``` bnf
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universal-character-name:
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'\u' hex-quad
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'\U' hex-quad hex-quad
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'\u{' simple-hexadecimal-digit-sequence '}'
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named-universal-character
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```
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The *universal-character-name* construct provides a way to name any
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element in the translation character set using just the basic character
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set. If a *universal-character-name* outside the *c-char-sequence*,
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*s-char-sequence*, or *r-char-sequence* of a *character-literal* or
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*string-literal* (in either case, including within a
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*user-defined-literal*) corresponds to a control character or to a
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character in the basic character set, the program is ill-formed.
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[*Note 1*: A sequence of characters resembling a
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*universal-character-name* in an *r-char-sequence* [[lex.string]] does
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not form a *universal-character-name*. — *end note*]
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A *universal-character-name* of the form `\u` *hex-quad*, `\U`
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*hex-quad* *hex-quad*, or `\u{simple-hexadecimal-digit-sequence}`
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| 50 |
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designates the character in the translation character set whose Unicode
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scalar value is the hexadecimal number represented by the sequence of
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| 52 |
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*hexadecimal-digit*s in the *universal-character-name*. The program is
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ill-formed if that number is not a Unicode scalar value.
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| 54 |
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A *universal-character-name* that is a *named-universal-character*
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designates the corresponding character in the Unicode Standard (chapter
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4.8 Name) if the *n-char-sequence* is equal to its character name or to
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one of its character name aliases of type “control”, “correction”, or
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“alternate”; otherwise, the program is ill-formed.
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[*Note 2*: These aliases are listed in the Unicode Character Database’s
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`NameAliases.txt`. None of these names or aliases have leading or
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trailing spaces. — *end note*]
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