MISRA C++:2008 Rule 2-3-1

Rule Definition

Trigraphs shall not be used.¹

Rationale

You denote trigraphs with two question marks followed by a specific third character (for instance,'??-' represents a '~' (tilde) character and '??)' represents a ']'). These trigraphs can cause accidental confusion with other uses of two question marks.

For instance, the string

"(Date should be in the form ??-??-??)"

"(Date should be in the form ~~]"

Polyspace Implementation

The rule checker reports violations on use of trigraphs, whether used in strings or otherwise.

Troubleshooting

If you expect a rule violation but Polyspace^® does not report it, see Diagnose Why Coding Standard Violations Do Not Appear as Expected.