Question

Is size_t only in C++ standard or C standard as well?

I cannot find a C header in the “/usr/include” tree that defines size_t.

If it is not in the C std, is GCC just doing some magic to make things work?

Thanks,
Chenz

Answer 1

From C99 draft:

7.17 Common definitions <stddef.h>

1. The following types and macros are defined in the standard header <stddef.h>. Some
   are also defined in other headers, as noted in their respective subclauses.

2. The types are [-snip-]

   size_t
   

   which is the unsigned integer type of the result of the sizeof operator; [-snip-]