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 "1 #
[ Note: Header name preprocessing tokens only appear within a #include preprocessing directive (see [lex.pptoken]). — end note ] The sequences in both forms of header-names are mapped in an implementation-defined manner to headers or to external source file names as specified in [cpp.include].
2 #The appearance of either of the characters ' or \ or of either of the character sequences /* or // in a q-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.20
20)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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