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Where is ptrdiff_t defined in C?

Where is ptrdiff_t de开发者_如何学Gofined in C?


It's defined in stddef.h.


That header defines the integral types size_t, ptrdiff_t, and wchar_t, the functional macro offsetof, and the constant macro NULL.


It is defined by the POSIX standard: http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/stddef.h.html Where the type is exactly may be implemetation-specific, but interface is stddef.h

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