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C/C++ code:
#ifndef _GLIBCXX_CSTDDEF
#define _GLIBCXX_CSTDDEF 1

#pragma GCC system_header

#include <stddef.h>

namespace std
{
using ::ptrdiff_t;
using ::size_t;
}

#endif

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C/C++ code:
#ifndef _GLIBCXX_CSTDDEF
#define _GLIBCXX_CSTDDEF 1

#pragma GCC system_header

namespace std
{
#include <stddef.h>
}

#endif

È˼ÒÄÇôдֻÊǽ«ptrdiff_tºÍsize_tµÄÉùÃ÷·ÅÈëµ½std namespace,ÄãÊǽ«Õû¸öÎļþ¶¼·ÅÈëµ½std namespace

namespace std
{
  using ::ptrdiff_t;
  using ::size_t;
}
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typedef int BTG;//È«¾Ö
namespace std
{
using ::BTG; //stdÃû×Ö¿Õ¼ä
}
int main()
{
std::BTG s; //ʹÓÃstdÃû×Ö¿Õ¼äµÄ·ûºÅ
BTG a; //È«¾Ö·ûºÅ
}

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