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Patterns.DefaultValue Active Pattern (F#)

  • Article

Recognizes expressions that represent invocations of a default constructor of a struct.

Namespace/Module Path: Microsoft.FSharp.Quotations.Patterns

Assembly: FSharp.Core (in FSharp.Core.dll)

// Signature:
( |DefaultValue|_| ) : (input:Expr) -> Type option

Parameters

  • input
    Type: Expr

    The input expression to match against.

Return Value

The formal return type is Type option. The option indicates whether the input results in a match. In a pattern matching expression, the input is decomposed, upon a successful match, into a type object that represents the type that is being constructed.

Remarks

This function is named DefaultValuePattern in the .NET Framework assembly. If you are accessing the member from a .NET Framework language other than F#, or through reflection, use this name.

Platforms

Windows 8, Windows 7, Windows Server 2012, Windows Server 2008 R2

Version Information

F# Core Library Versions

Supported in: 2.0, 4.0, Portable

See Also

Reference

Quotations.Patterns Module (F#)

Microsoft.FSharp.Quotations Namespace (F#)