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Why example in Rule 5-0-13 is non-compliant
Could someone please explain why the "if ( u8 && (bool_1 <= bool_2 ) )" in Rule 5-0-13 is non-compliant.
The example above the line you quote, "if (u8)", is non-compliant because u8 is not of type bool. The rationale is that it is unclear whether the programmer recognises that (u8) is equivalent to (u8 != 0) or whether some other condition has been omitted.

The example you quote is there to illustrate that 'u8' doesn't become an acceptable Boolean value when incorporated into a more complex expression. It is arguable that the condition isn’t non-compliant with 5-0-13, as the type of the logical && expression is bool. However, It is non-compliant with 5-3-1 “Each operand of the ! operator, the logical && or logical || operators shall have the type bool”. The comment ought to say ‘compliant with this rule, but non-compliant with 5-3-1’.
Posted by and on behalf of
the MISRA C++ Working Group

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