55 lines
2.6 KiB
Markdown
55 lines
2.6 KiB
Markdown
[lex.header]
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# 5 Lexical conventions [[lex]](./#lex)
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## 5.6 Header names [lex.header]
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[header-name:](#nt:header-name "5.6 Header names [lex.header]")
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< [*h-char-sequence*](#nt:h-char-sequence "5.6 Header names [lex.header]") >
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" [*q-char-sequence*](#nt:q-char-sequence "5.6 Header names [lex.header]") "
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[h-char-sequence:](#nt:h-char-sequence "5.6 Header names [lex.header]")
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[*h-char*](#nt:h-char "5.6 Header names [lex.header]") [*h-char-sequence*](#nt:h-char-sequence "5.6 Header names [lex.header]")opt
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[h-char:](#nt:h-char "5.6 Header names [lex.header]")
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any member of the translation character set except new-line and U+003e greater-than sign
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[q-char-sequence:](#nt:q-char-sequence "5.6 Header names [lex.header]")
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[*q-char*](#nt:q-char "5.6 Header names [lex.header]") [*q-char-sequence*](#nt:q-char-sequence "5.6 Header names [lex.header]")opt
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[q-char:](#nt:q-char "5.6 Header names [lex.header]")
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any member of the translation character set except new-line and U+0022 quotation mark
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[1](#1)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/lex.tex#L715)
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The sequences in both forms of [*header-name*](#nt:header-name "5.6 Header names [lex.header]")*s* are mapped in animplementation-defined manner to headers or to
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external source file names as specified in [[cpp.include]](cpp.include "15.3 Source file inclusion")[.](#1.sentence-1)
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[*Note [1](#note-1)*:
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Header name preprocessing tokens appear only within
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a #include preprocessing directive,
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a __has_include preprocessing expression, or
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after certain occurrences of an import token
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(see [[lex.pptoken]](lex.pptoken "5.5 Preprocessing tokens"))[.](#1.sentence-2)
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â *end note*]
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[2](#2)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/lex.tex#L727)
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The appearance of either of the characters ' or \ or of
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either of the character sequences /* or // in a[*q-char-sequence*](#nt:q-char-sequence "5.6 Header names [lex.header]") or an [*h-char-sequence*](#nt:h-char-sequence "5.6 Header names [lex.header]") is conditionally-supported with implementation-defined semantics, as is the appearance of the character" in an [*h-char-sequence*](#nt:h-char-sequence "5.6 Header names [lex.header]")[.](#2.sentence-1)
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[*Note [2](#note-2)*:
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Thus, a sequence of characters
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that resembles an escape sequence can result in an error, be interpreted as the
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character corresponding to the escape sequence, or have a completely different meaning,
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depending on the implementation[.](#2.sentence-2)
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â *end note*]
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