Type variable
In type theory and programming languages, a type variable is a mathematical variable ranging over types. Even in programming languages that allow mutable variables, a type variable remains an abstraction, in the sense that it does not correspond to some memory locations. # let id x = x;;val id : 'a -> 'a = <fun> In mathematical notation, the type of the function id is , where is a type variable.
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- enIn type theory and programming languages, a type variable is a mathematical variable ranging over types. Even in programming languages that allow mutable variables, a type variable remains an abstraction, in the sense that it does not correspond to some memory locations. # let id x = x;;val id : 'a -> 'a = <fun> In mathematical notation, the type of the function id is , where is a type variable.
- Has abstract
- enIn type theory and programming languages, a type variable is a mathematical variable ranging over types. Even in programming languages that allow mutable variables, a type variable remains an abstraction, in the sense that it does not correspond to some memory locations. Programming languages that support parametric polymorphism make use of universally quantified type variables. Languages that support existential types make use of existentially quantified type variables. For example, the following OCaml code defines a polymorphic identity function that has a universally quantified type, which is printed by the interpreter on the second line: # let id x = x;;val id : 'a -> 'a = <fun> In mathematical notation, the type of the function id is , where is a type variable.
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- Type variable
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- enType variable
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- Category:Dependently typed programming
- Category:Functional programming
- Category:Type theory
- Data types
- Existentially quantified
- Existential type
- Identity function
- OCaml
- Parametric polymorphism
- Programming language
- System F
- Type theory
- Universally quantified
- Variable (mathematics)
- Variable (programming)
- SameAs
- 4ooPt
- m.07kbmm2
- Q636210
- Zmienna typowa
- Змінна типу
- Переменная типа
- Subject
- Category:Dependently typed programming
- Category:Functional programming
- Category:Type theory
- WasDerivedFrom
- Type variable?oldid=990958811&ns=0
- WikiPageLength
- 1158
- Wikipage page ID
- 279701
- Wikipage revision ID
- 990958811
- WikiPageUsesTemplate
- Template:Type-theory-stub