The C standard (ISO/IEC 9899:2011 or 9899:1999) defines a type ptrdiff_t
in <stddef.h>
.
The POSIX standard (ISO/IEC 9945; IEEE Std 1003.1-2008) defines a type ssize_t
in <sys/types.h>
.
- What is the difference between these types (or why were both deemed necessary)?
- Is there an implementation where the underlying base type for
ssize_t
is not the same as forptrdiff_t
?