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Null pointer

In computing, a null pointer (sometimes shortened to nullptr or null) or null reference is a value indicating that the pointer or reference does not refer to an object. Programs routinely use null pointers to represent conditions such as the end of a list of unknown length or the failure to perform some action; this use of null pointers can be compared…

History, Null dereferencing & Mitigation

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Null dereferencing

DereferenceMITREAccess violationUnix-likeWindows
16 related topics

Mitigation

Java virtual machineFunctional languagesInterpretedCompilation-time checkingStatic analysis
10 related topics

Other languages

JavaC#PascalSwiftEiffel
6 related topics

History

ALGOL W
1 related topics

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Overview

C++

Other languages

  • Java Java (programming language)
  • C# C Sharp (programming language)
  • Pascal Pascal (programming language)
  • Swift Swift (programming language)
  • Eiffel Eiffel (programming language)
  • Rust Rust (programming language)

Null dereferencing

Mitigation

History

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Map overview Semantic statistics

Null pointer

Nodes57
Edges56
Triples66
Avg. degree1.96
Density0.035088
Components1

How this topic connects Entity context

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Null pointer

Top relations

related to Null dereferencing · 38
Null pointer → Although, Because, Before, C/C, Dereferencing, However, In, In Cyclone, In Delphi, In Java, In Objective-C, In Rust, It, Libraries, LogicException, Many, MITRE, NET, NPE, NullPointerExceptionextendsjava
related to C · 6
Null pointer → C99, Dereferencing, In, NULL, Since C23, The
related to Other languages · 6
Null pointer → In Eiffel, In Java, In Pascal, In Rust, Programming, Swift
related to Mitigation · 5
Null pointer → Bond, Java, JVM, There, While
related to C++ · 3
Null pointer → C23, However, In
is a · 1
Null pointer → same as the pointer to memory address 0

Important terminology Word statistics

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Important terminology

null pointer languages dereferencing access pointers reference memory type object exception also code behavior may undefined program value error dereference

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Null pointeris asame as the pointer to memory address 00.90text
the end of a list of unknown length or the failure to perform some actioninstance ofPrograms routinely use null pointers to represent conditions0.80text
Unix-like systemsinstance ofOn platforms0.80text
Windows with the Visual Studio compilerinstance ofOn platforms0.80text
an access violation causes a C/Cinstance ofOn platforms0.80text
those seen in the Eiffel programming language with Void safety to avoid null dereferencesinstance ofwith syntactic assistance from language features0.80text
Dinstance ofwith syntactic assistance from language features0.80text
and Rustinstance ofwith syntactic assistance from language features0.80text
Null pointerrelated to CIn0.60section
Null pointerrelated to CThe0.60section
Null pointerrelated to CC990.60section
Null pointerrelated to CNULL0.60section

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    Min side: 3
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