fix: Wrapper over an already given instance

Author: Vyacheslav

Src/StackMemoryCollections/GenerateWrappers.cs

@@ -214,7 +214,8 @@ in StringBuilder builder
         {
             builder.Append($@"
         public {currentType.Name}Wrapper(
-            void* start
+            void* start,
+            bool createInstance
             )
         {{
             if (start == null)
@@ -226,6 +227,12 @@ in StringBuilder builder
             _stackMemoryC = null;
             _stackMemoryS = null;
 ");
+            builder.Append($@"
+            if(createInstance)
+            {{
+            
+");
+
             if (!currentType.IsValueType)
             {
                 builder.Append($@"
@@ -246,6 +253,7 @@ in StringBuilder builder
             }
 
             builder.Append($@"
+            }}
         }}
 ");
         }

Src/Tests/StackOfTestStructFixture.cs

@@ -307,8 +307,8 @@ public void CopyTest()
                     stack2.Size = stack.Size;
                     Assert.That(stack.Size, Is.EqualTo(stack2.Size));
 
-                    using var wrap = new Tests.Struct.TestStructWrapper(stack[0]);
-                    using var wrap2 = new Tests.Struct.TestStructWrapper(stack2[0]);
+                    using var wrap = new Tests.Struct.TestStructWrapper(stack[0], false);
+                    using var wrap2 = new Tests.Struct.TestStructWrapper(stack2[0], false);
                     Assert.That(wrap.Int32, Is.EqualTo(wrap2.Int32));
                     Assert.That(wrap.Int64, Is.EqualTo(wrap2.Int64));
                     Assert.That(wrap.TestClass.Int32, Is.EqualTo(wrap2.TestClass.Int32));
@@ -539,7 +539,7 @@ public void IndexTest()
                     stack.Push(item3);
 
                     Assert.That(new IntPtr(stack[0]), Is.EqualTo(new IntPtr((byte*)memory.Start + (TestStructHelper.GetSize() * 2))));
-                    using var wrap = new Tests.Struct.TestStructWrapper(stack[0]);
+                    using var wrap = new Tests.Struct.TestStructWrapper(stack[0], false);
                     Assert.That(wrap.Int32, Is.EqualTo(7));
                     Assert.That(wrap.Int64, Is.EqualTo(21));
                     Assert.That(wrap.TestClass.Int32, Is.EqualTo(6));