c - Aliasing with char *, unsigned char * and signed char * -

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a char * (and qualified variants) may alias anything. signed char * , unsigned char * (and qualified variants) exempt this?

in other words, i've learned it's idea apply restrict char* function arguments if don't expect them alias pointer parameters of other types (because alias them):

int func(struct foo *f, char * restrict s /*different object*/);

can drop restrict keyword signed , unsigned char variants so?

int sfunc(struct foo *f, signed char *s /*different object*/); int ufunc(struct foo *f, unsigned char *s /*different object*/);

also may pointers signed , unsigned variant of same type alias each other? in other words if expect pointer int , pointer unsigned , should point different objects, should int * , unsigned * parameters each restrict-qualified?

/* , u should different */ int uifunc(int * /*restrict?*/ i, unsigned * /*restrict?*/ u);

the rule (c11 6.5/7):

an object shall have stored value accessed lvalue expression has 1 of following types:

  • a type compatible effective type of object,
  • a qualified version of type compatible effective type of object,
  • a type signed or unsigned type corresponding effective type of object,
  • a type signed or unsigned type corresponding qualified version of effective type of object,
  • an aggregate or union type includes 1 of aforementioned types among members (including, recursively, member of subaggregate or contained union), or
  • a character type.

char, signed char , unsigned char character types (ref: 6.2.5/15). earlier bullets answer question signed , unsigned types.

bear in mind fixed width types typedefs may refer various other types, take care there.


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