This rule is part of MISRA C++:2023.
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Rule 12.2.3 - A named bit-field with signed integer type shall not have a length of one bit
Category: Required
Analysis: Decidable,Single Translation Unit
Rationale
A single-bit signed bit-field is unlikely to behave in a useful way and its presence is likely to indicate an error.
Note: anonymous signed bit-fields of any length are allowed as they cannot be accessed.
Example
struct S
{
signed int a : 1; // Non-compliant
signed int : 1; // Rule does not apply
signed int : 0; // Rule does not apply
signed int b : 2; // Compliant
int c : 1; // Non-compliant
};
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