Initial Commit

2DGAMELIB/System.Diagnostics.CodeAnalysis/NotNullWhenAttribute.cs

@@ -0,0 +1,12 @@
+namespace System.Diagnostics.CodeAnalysis;
+
+[AttributeUsage(AttributeTargets.Parameter)]
+internal sealed class NotNullWhenAttribute : Attribute
+{
+    public NotNullWhenAttribute(bool returnValue)
+    {
+        ReturnValue = returnValue;
+    }
+
+    public bool ReturnValue { get; }
+}