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Defines the macros traditionally defined in the Standard C library header <stddef.h>.

   #include <stddef.h>
namespace std {
   using ::ptrdiff_t; 
   using ::size_t;

Including this header also ensures that the names declared with external linkage in the Standard C library header are declared in the std namespace. In this implementation, the names may or may not also be declared in the global namespace, depending on the specific translation environment.