Add SimpleList<T>.RemoveLastSize

Author: kzrnm

Source/ac-library-csharp/Internal/SimpleList.cs

@@ -66,6 +66,12 @@ public void RemoveLast()
                 ThrowIndexOutOfRangeException();
         }
         [MethodImpl(256)]
+        public void RemoveLast(int size)
+        {
+            if ((Count -= size) < 0)
+                ThrowIndexOutOfRangeException();
+        }
+        [MethodImpl(256)]
         public SimpleList<T> Reverse()
         {
             Array.Reverse(data, 0, Count);

Test/ac-library-csharp.Test/Internal/SimpleListTest.cs

@@ -46,6 +46,20 @@ public void AddAndRemove()
             list.Should().Equal(1, 2, 3, 4, 5, 7);
         }
 
+        [Fact]
+        public void RemoveLastSize()
+        {
+            var list = new SimpleList<int>
+            {
+                1,2,3,4,5,6
+            };
+            list.Should().Equal(1, 2, 3, 4, 5, 6);
+            list.RemoveLast(2);
+            list.Should().Equal(1, 2, 3, 4);
+            list.RemoveLast(4);
+            list.Should().BeEmpty();
+        }
+
         [Fact]
         public void Reverse()
         {