Patterns.Lambda Active Pattern (F#)
Recognizes expressions that represent first-class function values.
Namespace/Module Path: Microsoft.FSharp.Quotations.Patterns
Assembly: FSharp.Core (in FSharp.Core.dll)
// Signature:
( |Lambda|_| ) : (input:Expr) -> (Var * Expr) option
Parameters
input
Type: ExprThe input expression to match against.
Return Value
The formal return type is (Var * Expr) 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 tuple of two elements. The first element is a Var object that represents a single argument. The second object is an expression that represents the body of the lambda expression. Lambda expressions that have multiple arguments are decomposed one argument at a time. For example, a lambda expression that has two arguments is decomposed so that the Var element is the first argument, and the Expr element is a lambda expression that can be recursively decomposed so that the second-level Var element is the second argument and the second-level Expr element is the body.
Remarks
This function is named LambdaPattern 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