Pointer types
The compiler has two basic types of pointers: function pointers and data pointers. Pointer types have the same alignment as the corresponding integer type.
Casting
Casts between pointers have these characteristics:
Casting a value of an integer type to a pointer of a smaller type is performed by truncation
Casting a value of an integer type to a pointer of a larger type is performed by zero extension
Casting a pointer type to a smaller integer type is performed by truncation
Casting a pointer type to a larger integer type is performed by zero extension
Casting a data pointer to a function pointer and vice versa is illegal
Casting a function pointer to an integer type gives an undefined result
size_t
size_t is the unsigned integer type of the result of the sizeof operator. In the IAR C/C++ Compiler for RX, the type used for size_t is unsigned long.
ptrdiff_t
ptrdiff_t is the signed integer type of the result of subtracting two pointers. In the IAR C/C++ Compiler for RX, the type used for ptrdiff_t is the signed integer variant of the size_t type.
intptr_t
intptr_t is a signed integer type large enough to contain a void*. In the IAR C/C++ Compiler for RX, the type used for intptr_t is signed long.
uintptr_t
uintptr_t is equivalent to intptr_t, with the exception that it is unsigned.