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This header contains definitions of the following types and macros.
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NULL
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the null pointer constant
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offsetof
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the byte offset of a structure member from the start of the structure
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ptrdiff_t
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the type of the result of subtracting one pointer from another
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size_t
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the type of the result of sizeof and offsetof.
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wchar_t
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the type of a wide character: see multibyte characters and strings.
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NULL and offsetof are discussed further in the list of functions.
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