1 files changed, 59 insertions, 0 deletions
diff --git a/Samples/AnimTest/MiscUtil/NullOp.cs b/Samples/AnimTest/MiscUtil/NullOp.cs
new file mode 100644
index 00000000..7bb8790a
--- /dev/null
+++ b/Samples/AnimTest/MiscUtil/NullOp.cs
@@ -0,0 +1,59 @@
+
+namespace MiscUtil
+{
+    interface INullOp<T>
+    {
+        bool HasValue(T value);
+        bool AddIfNotNull(ref T accumulator, T value);
+    }
+    sealed class StructNullOp<T>
+        : INullOp<T>, INullOp<T?>
+        where T : struct
+    {
+        public bool HasValue(T value)
+        {
+            return true;
+        }
+        public bool AddIfNotNull(ref T accumulator, T value)
+        {
+            accumulator = Operator<T>.Add(accumulator, value);
+            return true;
+        }
+        public bool HasValue(T? value)
+        {
+            return value.HasValue;
+        }
+        public bool AddIfNotNull(ref T? accumulator, T? value)
+        {
+            if (value.HasValue)
+            {
+                accumulator = accumulator.HasValue ?
+                    Operator<T>.Add(
+                        accumulator.GetValueOrDefault(),
+                        value.GetValueOrDefault())
+                    : value;
+                return true;
+            }
+            return false;
+        }
+    }
+    sealed class ClassNullOp<T>
+        : INullOp<T>
+        where T : class
+    {
+        public bool HasValue(T value)
+        {
+            return value != null;
+        }
+        public bool AddIfNotNull(ref T accumulator, T value)
+        {
+            if (value != null)
+            {
+                accumulator = accumulator == null ?
+                    value : Operator<T>.Add(accumulator, value);
+                return true;
+            }
+            return false;
+        }
+    }
+}
+\ No newline at end of file