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Showing content from https://learn.microsoft.com/en-us/dotnet/api/system.runtime.compilerservices.unsafe.isnullref below:

Unsafe.IsNullRef<T>(T) Method (System.Runtime.CompilerServices) | Microsoft Learn

Unsafe.IsNullRef<T>(T) Method Definition

Determines if a given managed pointer to a value of type T is a null reference.

public:
generic <typename T>
 static bool IsNullRef(T % source);
public static bool IsNullRef<T>(ref T source) where T : allows ref struct;
public static bool IsNullRef<T>(ref T source);
static member IsNullRef : 'T -> bool
Public Shared Function IsNullRef(Of T) (ByRef source As T) As Boolean
Type Parameters
T

The elemental type of the managed pointer.

Parameters
source
T

The managed pointer to check.

Returns

true if source is a null reference; otherwise, false.

Remarks

This check is conceptually similar to (void*)(&source) == nullptr.

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