Patterns.DefaultValue Active Pattern (F#)
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: ExprThe 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 7, Windows Vista SP2, Windows XP SP3, Windows XP x64 SP2, Windows Server 2008 R2, Windows Server 2008 SP2, Windows Server 2003 SP2
Version Information
F# Runtime
Supported in: 2.0, 4.0
Silverlight
Supported in: 3