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Showing content from https://learn.microsoft.com/dotnet/api/system.buffers.readonlyspanaction-2 below:

ReadOnlySpanAction<T,TArg> Delegate (System.Buffers) | Microsoft Learn

ReadOnlySpanAction<T,TArg> Delegate Definition

Encapsulates a method that receives a read-only span of objects of type T and a state object of type TArg.

generic <typename T, typename TArg>
public delegate void ReadOnlySpanAction(ReadOnlySpan<T> span, TArg arg);
public delegate void ReadOnlySpanAction<T,in TArg>(ReadOnlySpan<T> span, TArg arg) where TArg : allows ref struct;
public delegate void ReadOnlySpanAction<T,in TArg>(ReadOnlySpan<T> span, TArg arg);
type ReadOnlySpanAction<'T, 'Arg> = delegate of ReadOnlySpan<'T> * 'Arg -> unit
Public Delegate Sub ReadOnlySpanAction(Of T, In TArg)(span As ReadOnlySpan(Of T), arg As TArg)
Type Parameters
T

The type of the objects in the read-only span.

TArg

The type of the object that represents the state.

This type parameter is contravariant. That is, you can use either the type you specified or any type that is less derived. For more information about covariance and contravariance, see

Covariance and Contravariance in Generics

.

Parameters
arg
TArg

A state object of type TArg.

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