Rule 11.8: non-compatible pointees

[misra-c]

This rule only applies to the type qualifiers of the type pointed to by the top-level pointer.
For example:
It is a violation of this rule to cast an object of type "X const *" to "Y *".
The presence/absence of type qualifiers within X or Y are covered by rule 11.3 and not by this rule.

For example:

Code:

"const int **ppci" is a "pointer to pointer to const int".
         The "pointer to const int" has no type qualifiers.
"int *const *pcpi" is a "pointer to const pointer to int".  
        The "pointer to int" has a const type qualifier
Performing the cast "( const int**)(pcpi)"  would cast away the const and violate this rule.

Looking at the specific examples

Code:

pi = (int*) &a;  
  Casts "ptr to array of const int" to "ptr to int".  
  Compliant: no top-level type qualifier removed
            
ppi = (int**) cppi;
  Casts "ptr to ptr to const int" to "ptr to ptr to int"
  Compliant: no top-level type qualifier removed

ppi = (int**) cppf;
  Casts "ptr to ptr to const float" to "ptr to ptr to int"
  Compliant: no top-level type qualifier removed

All these examples would violate rule 11.3