Are all data pointers the same size in one platform for all data types? [duplicate]

by

They’re not guaranteed to be the same size, although on the platforms I have experience with they usually are.

C 2011 online draft:

6.2.5 Types
…
28     A pointer to void shall have the same representation and alignment requirements as a
pointer to a character type.48) Similarly, pointers to qualified or unqualified versions of
compatible types shall have the same representation and alignment requirements. All
pointers to structure types shall have the same representation and alignment requirements
as each other. All pointers to union types shall have the same representation and
alignment requirements as each other. Pointers to other types need not have the same
representation or alignment requirements.

48) The same representation and alignment requirements are meant to imply interchangeability as
arguments to functions, return values from functions, and members of unions.

More Related Contents:

  1. In C, what is the correct syntax for declaring pointers?
  2. C array pointer increment
  3. Convert double * to double [9] in C [closed]
  4. Why this program is crashing?
  5. Segmentation fault using scanf() [closed]
  6. Is an array name a pointer?
  7. Returning an array using C
  8. Arrow operator (->) usage in C
  9. Why use double indirection? or Why use pointers to pointers?
  10. Should I explicitly cast malloc()’s return value? [duplicate]
  11. Function pointers and address of a function
  12. Question about C behaviour for unsigned integer underflow
  13. In C, can a const variable be modified via a pointer?
  14. Why a pointer + 1 add 4 actually
  15. Pointers as function arguments in C
  16. What is the result of NULL + int?
  17. C – Difference between “char var[]” and “char *var”?
  18. Difference between char* var; and char *var;? [duplicate]
  19. Difference between _Bool and bool types in C?
  20. Rationale behind the container_of macro in linux/list.h
  21. casting char[][] to char** causes segfault?
  22. Literal string initializer for a character array
  23. Does Function pointer make the program slow?
  24. Simple swap function…why doesn’t this one swap?
  25. What is the uintptr_t data type?
  26. C isn’t that hard: void ( *( *f[] ) () ) ()
  27. When printf is an address of a variable, why use void*?
  28. Pointer expressions: **ptr++, *++*ptr and ++**ptr use
  29. In C, is it good form to use typedef for a pointer?
  30. What is the function of an asterisk before a function name?

Leave a Comment