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Inline functions are, in general, more suitable for this task. (See PRE00-C. Prefer inline or static functions to function-like macros.) Occasionally, however, they are not feasible (when macros are expected to operate on variables of different types, for example).
When multiple statements are used in a macro, they should be bound together in a do-while loop syntactically, so the macro can appear safely inside if clauses or other places that expect a single statement or a statement block. (Alternatively, when an if, for, or while statement uses braces even for a single body statement, then multiple statements in a macro will expand correctly even without a do-while loop. See EXP19-C. Use braces for the body of an if, for, or while statement.
Noncompliant Code Example
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| CERT C++ Secure Coding Standard | PRE10-CPP. Wrap multi-statement multistatement macros in a do-while loop |
|---|---|
| ISO/IEC TR 24772 | "NMP Pre-processor directions" |
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