stddef.h
E888287
stddef.h is a standard C header file that defines common types and macros such as size_t, ptrdiff_t, wchar_t, NULL, and offsetof for use in C programs.
All labels observed (1)
| Label | Occurrences |
|---|---|
| stddef.h canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T10826299 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: stddef.h Context triple: [C90, includesLibraryHeader, stddef.h]
-
A.
ISO/IEC 9899
ISO/IEC 9899 is the international standard that defines the C programming language’s syntax, semantics, and library.
-
B.
POSIX
POSIX is a family of standardized operating system interfaces and utilities that ensure compatibility and portability among Unix-like systems and applications.
-
C.
GNU C Library
The GNU C Library (glibc) is the GNU Project’s core implementation of the standard C library, providing fundamental system call wrappers and APIs used by most GNU/Linux and Unix-like systems.
-
D.
System V Interface Definition
The System V Interface Definition is a standardized specification that defines the application programming interfaces and behavior for UNIX System V–based operating systems to ensure compatibility and portability across different implementations.
-
E.
System V ABI
The System V ABI is a standardized application binary interface that defines calling conventions, binary formats, and low-level system interfaces for Unix-like operating systems derived from or compatible with System V.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: stddef.h Target entity description: stddef.h is a standard C header file that defines common types and macros such as size_t, ptrdiff_t, wchar_t, NULL, and offsetof for use in C programs.
-
A.
ISO/IEC 9899
ISO/IEC 9899 is the international standard that defines the C programming language’s syntax, semantics, and library.
-
B.
POSIX
POSIX is a family of standardized operating system interfaces and utilities that ensure compatibility and portability among Unix-like systems and applications.
-
C.
GNU C Library
The GNU C Library (glibc) is the GNU Project’s core implementation of the standard C library, providing fundamental system call wrappers and APIs used by most GNU/Linux and Unix-like systems.
-
D.
System V Interface Definition
The System V Interface Definition is a standardized specification that defines the application programming interfaces and behavior for UNIX System V–based operating systems to ensure compatibility and portability across different implementations.
-
E.
System V ABI
The System V ABI is a standardized application binary interface that defines calling conventions, binary formats, and low-level system interfaces for Unix-like operating systems derived from or compatible with System V.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf | C standard library header ⓘ |
| belongsToVersion |
C11
ⓘ
C17 ⓘ C23 ⓘ C90 ⓘ C99 ⓘ
linked to:
ISO/IEC 9899
|
| canBeIncludedWith | #include <stddef.h> ⓘ |
| definedIn |
ISO C standard
ⓘ
linked to:
ISO/IEC 9899
|
| definesMacro |
NULL
ⓘ
max_align_t ⓘ offsetof ⓘ |
| definesType |
ptrdiff_t
ⓘ
rsize_t ⓘ size_t ⓘ wchar_t ⓘ wint_t ⓘ |
| fileExtension | .h ⓘ |
| headerKind | fundamental types header ⓘ |
| introducedIn |
C89
ⓘ
linked to:
C
|
| language | C ⓘ |
| macroCategory |
null pointer constant macro
ⓘ
object size and offset macro ⓘ |
| max_align_tIsUsedFor | maximum alignment requirement ⓘ |
| namespace | global C namespace ⓘ |
| NULLisUsedFor | null pointer constant ⓘ |
| offsetofIsUsedFor | computing byte offset of struct member ⓘ |
| partOf |
C standard library
ⓘ
linked to:
GNU C Library
|
| portable | yes ⓘ |
| ptrdiff_tIsUsedFor | difference between pointers ⓘ |
| requiredBy | all conforming hosted C implementations ⓘ |
| rsize_tIsUsedFor | bounded-size interfaces in C11 Annex K ⓘ |
| size_tIsUsedFor |
array indexing
ⓘ
object sizes ⓘ |
| specifiedIn | ISO/IEC 9899 ⓘ |
| typeCategory |
implementation-defined typedefs
ⓘ
signed integer type for pointer differences ⓘ unsigned integer type for sizes ⓘ wide character type ⓘ |
| usedFor |
array indexing and size calculations
ⓘ
defining common C macros ⓘ defining common C types ⓘ pointer arithmetic support ⓘ structure member offset computation ⓘ |
| usedIn |
application-level C code
ⓘ
system headers implementation ⓘ |
| wchar_tIsUsedFor | wide character representation ⓘ |
| wint_tIsUsedFor | wide character I/O functions ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: stddef.h Description of subject: stddef.h is a standard C header file that defines common types and macros such as size_t, ptrdiff_t, wchar_t, NULL, and offsetof for use in C programs.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.