<cstdint>
Include the standard header <cstdint> to define the macros that are traditionally defined in the Standard C library header <stdint.h>. Including this header also ensures that the names that are declared with external linkage in the Standard C library header are declared in the std namespace. In this implementation, the names might or might not also be declared in the global namespace, depending on the specific translation environment.
#include <cstdint>