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[lex.trigraph]

2.4 Trigraph sequences [lex.trigraph]

Before any other processing takes place, each occurrence of one of the following sequences of three characters (“trigraph sequences”) is replaced by the single character indicated in Table [tab:trigraph.sequences].

Table

1

— Trigraph sequences


Trigraph Replacement Trigraph Replacement Trigraph Replacement ??= # ??( [ ??< { ??/ \ ??) ] ??> } ??' ^ ??! | ??- ~

Example:

??=define arraycheck(a,b) a??(b??) ??!??! b??(a??)

becomes

#define arraycheck(a,b) a[b] || b[a]

 — end example ]

No other trigraph sequence exists. Each ? that does not begin one of the trigraphs listed above is not changed.


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