Initial Commit

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

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+namespace System.Diagnostics.CodeAnalysis;
+
+[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter)]
+internal sealed class AllowNullAttribute : Attribute
+{
+}

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

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+namespace System.Diagnostics.CodeAnalysis;
+
+[AttributeUsage(AttributeTargets.Parameter)]
+internal class DoesNotReturnIfAttribute : Attribute
+{
+    public DoesNotReturnIfAttribute(bool parameterValue)
+    {
+        ParameterValue = parameterValue;
+    }
+
+    public bool ParameterValue { get; }
+}

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

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+namespace System.Diagnostics.CodeAnalysis;
+
+[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter |
+                AttributeTargets.ReturnValue)]
+internal sealed class MaybeNullAttribute : Attribute
+{
+}

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

@@ -0,0 +1,8 @@
+namespace System.Diagnostics.CodeAnalysis;
+
+[AttributeUsage(
+    AttributeTargets.Method | AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter |
+    AttributeTargets.ReturnValue, AllowMultiple = true)]
+internal sealed class NotNullAttribute : Attribute
+{
+}

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

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