The values that can be represented by a signed bit field with a length of one bit may not meet developer expectations. For example according to the C99 Standard, Section 6.2.6.2, a single-bit signed bit-field has a single (one) sign bit and no (zero) value bits.


This rule does not apply to unnamed bit fields, as their values cannot be accessed.


== Noncompliant Code Example

----
signed int f:1;  // Noncompliant; there's only room here for the sign
----


== Compliant Solution

----
unsigned int f:1;
----
or

----
signed int:1; // unnamed
----
or

----
signed int f:2;
----


== See

* MISRA C:2004, 6.5 - Bit fields of type signed int shall be at least 2 bits long
* MISRA C:2012, 6.2 - Single-bit named bit fields shall not be of a signed type
* MISRA {cpp}:2008, 9-6-4 - Named bit-fields with signed integer type shall have a length of more than one bit


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== Comments And Links
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