[lex.header] (original) (raw)

5 Lexical conventions [lex]

5.8 Header names [lex.header]

header-name: < h-char-sequence > " q-char-sequence "

h-char-sequence: h-char h-char-sequence h-char

h-char: any member of the source character set except new-line and >

q-char-sequence: q-char q-char-sequence q-char

q-char: any member of the source character set except new-line and "

[ Note

:

Header name preprocessing tokens only appear within a #include preprocessing directive, a _­_­has_­include preprocessing expression, or after certain occurrences of an import token (see [lex.pptoken]).

— end note

]

The sequences in both forms of header-names are mapped in animplementation-defined manner to headers or to external source file names as specified in [cpp.include].

The appearance of either of the characters ' or \ or of either of the character sequences /* or // in aq-char-sequence or an h-char-sequenceis conditionally-supported with implementation-defined semantics, as is the appearance of the character" in an h-char-sequence.14

Thus, a sequence of characters that resembles an escape sequence might result in an error, be interpreted as the character corresponding to the escape sequence, or have a completely different meaning, depending on the implementation.

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