MISRA C++:2008 Rule 2-5-1

Digraphs should not be used

Description

Rule Definition

Digraphs should not be used.¹

Rationale

Digraphs are a sequence of two characters that are supposed to be treated as a single character. The checker flags use of these digraphs:

• <%, indicating {

• %>, indicating }

• <:, indicating [

• :>, indicating ]

• %:, indicating #

• %:%:, indicating ##

When developing or reviewing code with digraphs, the developer or reviewer can incorrectly consider the digraph as a sequence of separate characters.

Troubleshooting

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

Check Information

Group: Lexical Conventions

Category: Advisory

Version History

Introduced in R2013b