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Showing content from https://cplusplus.com/reference/cstddef/ below:

header

<cstddef> (stddef.h)

C Standard definitions

This header defines several types implicitly generated or used by certain language expressions.

Types
ptrdiff_t
Result of pointer subtraction (type)
size_t
Unsigned integral type (type)
max_align_t
Type with widest scalar alignment (type)
nullptr_t
Null pointer type (C++) (type)

In C, this header also includes the declaration of the wchar_t type (wide character type), which in C++ is a language keyword that identifies a distinct fundamental type (no header inclusion required in C++).

Macro functions
offsetof
Return member offset (macro)

Macro constants
NULL
Null pointer (macro)

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