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Union type

In computer science, a union is a value that may have any of multiple representations or formats within the same area of memory, or a variable that may hold such a data structure. Some programming languages support a union type for such a data type. In other words, a union type specifies the permitted types that may be stored in its instances, e.g.…

Science, Unions in various programming languages & Overview

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Unions in various programming languages

ALGOL 68C++StructsC++11String
16 related topics

Overview

Computer scienceValueMemoryVariableData structure
18 related topics

Syntax and example

PODC++17Pattern matchingNullableInterfaces
8 related topics

Untagged unions

SetUnion
2 related topics

Topics to explore

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Overview

Untagged unions

  • Set Set (mathematics)
  • Union Union (set theory)

Unions in various programming languages

Syntax and example

Advanced semantic analysis

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Map overview Semantic statistics

Union type

Nodes49
Edges48
Triples48
Avg. degree1.96
Density0.040816
Components1

How this topic connects Entity context

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Union type

Top relations

related to COBOL · 10
Union type → In, In COBOL, PERSON-DATA, PERSON-REC, REDEFINES, RENAMES, Since, The, VERS-BYTES, VERS-NUM
related to TypeScript · 7
Union type → Because JavaScript, However, JavaScript, This, TypeScript, Union, When TypeScript
related to Java · 5
Union type → Acatchclause, Java, The, This, Union
related to Untagged unions · 5
Union type → Also, Because, If, The, They
related to ALGOL 68 · 4
Union type → ALGOL, An, C/C, The
related to C# · 4
Union type → It, The, They, Until
related to PHP · 3
Union type → PHP, The, Union
related to Python · 3
Union type → Python, Support, The

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Important terminology

union data type unions types value example memory may tagged one rust use variable bytes also structure defined untagged syntax

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
GCCinstance ofAnonymous unions are also useful in Cstructdefinitions to provide a sense of namespacing.Transparent unionIn compilers0.80text
Clanginstance ofAnonymous unions are also useful in Cstructdefinitions to provide a sense of namespacing.Transparent unionIn compilers0.80text
and IBM XL C for AIXinstance ofAnonymous unions are also useful in Cstructdefinitions to provide a sense of namespacing.Transparent unionIn compilers0.80text
GCCinstance ofTransparent unionIn compilers0.80text
Clanginstance ofTransparent unionIn compilers0.80text
and IBM XL C for AIXinstance ofTransparent unionIn compilers0.80text
addition or indexing will behave is determined at runtime based on the type of the valueinstance ofhow operations0.80text
Union typerelated to ALGOL 68ALGOL0.60section
Union typerelated to ALGOL 68An0.60section
Union typerelated to ALGOL 68The0.60section
Union typerelated to ALGOL 68C/C0.60section
Union typerelated to C#Until0.60section

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