C语言 ptrdiff_t 在 C 中定义在哪里？
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Where is ptrdiff_t defined in C?
提问by Matt Joiner
Where is ptrdiff_tdefined in C?
ptrdiff_t在 C 中定义在哪里？
回答by GManNickG
It's defined in stddef.h.
它在stddef.h.
That header defines the integral types size_t, ptrdiff_t, and wchar_t, the functional macro offsetof, and the constant macro NULL.
该标题定义了整数类型size_t，ptrdiff_t以及wchar_t，功能宏offsetof，和恒定的宏NULL。
回答by Matt Joiner
It is defined by the POSIX standard: http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/stddef.h.htmlWhere the type is exactly may be implemetation-specific, but interface is stddef.h
它是由 POSIX 标准定义的：http: //pubs.opengroup.org/onlinepubs/9699919799/basedefs/stddef.h.html确切地说，类型可能是特定于实现的，但接口是 stddef.h
