feat: resolve #38

+ Set nullable properties/fields to null

Author: Vyacheslav

Src/StackMemoryCollections/GenerateWrappers.cs

@@ -2,6 +2,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Reflection;
 using System.Text;
 
 namespace StackMemoryCollections
@@ -42,7 +43,7 @@ in Dictionary<string, TypeInfo> typeInfos
             WrapperConstructor1(in currentType, in typeInfo, in builder);
             WrapperConstructor2(in currentType, in typeInfo, in builder);
             WrapperConstructor3(in currentType, in typeInfo, in builder);
-            WrapperConstructor4(in currentType, in builder);
+            WrapperConstructor4(in currentType, in typeInfo, in builder);
 
             WrapperProperties(in typeInfo, in builder, in typeInfos);
 
@@ -101,6 +102,18 @@ in StringBuilder builder
 ");
             }
 
+            for (int i = 0; i < typeInfo.Members.Count; i++)
+            {
+                var currentMember = typeInfo.Members[i];
+                if (!currentMember.IsValueType)
+                {
+                    builder.Append($@"
+            //set null marker {currentMember.MemberName}
+            *((byte*)_start + {currentMember.Offset}) = 0;
+");
+                }
+            }
+
             builder.Append($@"
         }}
 ");
@@ -132,6 +145,18 @@ in StringBuilder builder
 ");
             }
 
+            for (int i = 0; i < typeInfo.Members.Count; i++)
+            {
+                var currentMember = typeInfo.Members[i];
+                if (!currentMember.IsValueType)
+                {
+                    builder.Append($@"
+            //set null marker {currentMember.MemberName}
+            *((byte*)_start + {currentMember.Offset}) = 0;
+");
+                }
+            }
+
             builder.Append($@"
         }}
 ");
@@ -164,13 +189,26 @@ StackMemoryCollections.Class.StackMemory stackMemory
 ");
             }
 
+            for (int i = 0; i < typeInfo.Members.Count; i++)
+            {
+                var currentMember = typeInfo.Members[i];
+                if (!currentMember.IsValueType)
+                {
+                    builder.Append($@"
+            //set null marker {currentMember.MemberName}
+            *((byte*)_start + {currentMember.Offset}) = 0;
+");
+                }
+            }
+
             builder.Append($@"
         }}
 ");
         }
 
         private void WrapperConstructor4(
             in INamedTypeSymbol currentType,
+            in TypeInfo typeInfo,
             in StringBuilder builder
             )
         {
@@ -195,6 +233,18 @@ in StringBuilder builder
 ");
             }
 
+            for (int i = 0; i < typeInfo.Members.Count; i++)
+            {
+                var currentMember = typeInfo.Members[i];
+                if (!currentMember.IsValueType)
+                {
+                    builder.Append($@"
+            //set null marker {currentMember.MemberName}
+            *((byte*)_start + {currentMember.Offset}) = 0;
+");
+                }
+            }
+
             builder.Append($@"
         }}
 ");