2.6 KiB
[lex.header]
5 Lexical conventions [lex]
5.6 Header names [lex.header]
header-name:
< h-char-sequence >
" q-char-sequence "
h-char-sequence:
h-char h-char-sequenceopt
h-char:
any member of the translation character set except new-line and U+003e greater-than sign
q-char-sequence:
q-char q-char-sequenceopt
q-char:
any member of the translation character set except new-line and U+0022 quotation mark
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].
[Note 1:
Header name preprocessing tokens appear only within a #include preprocessing directive, a __has_include preprocessing expression, or after certain occurrences of an import token (see [lex.pptoken]).
â end note]
The appearance of either of the characters ' or \ or of either of the character sequences /* or // in aq-char-sequence or an h-char-sequence is conditionally-supported with implementation-defined semantics, as is the appearance of the character" in an h-char-sequence.
[Note 2:
Thus, a sequence of characters that resembles an escape sequence can result in an error, be interpreted as the character corresponding to the escape sequence, or have a completely different meaning, depending on the implementation.
â end note]