From 806d9d7a953cb8d935656cd41c63e1cb75abcd2f Mon Sep 17 00:00:00 2001
From: Randy Heit <rheit@users.noreply.github.com>
Date: Sun, 3 Apr 2016 16:18:59 -0500
Subject: [PATCH] Add an AddField() override to PClass that extends the default
 instance

---
 src/dobjtype.cpp | 18 ++++++++++++++++++
 src/dobjtype.h   |  3 ++-
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/src/dobjtype.cpp b/src/dobjtype.cpp
index 552b8ee685..028b9e82b1 100644
--- a/src/dobjtype.cpp
+++ b/src/dobjtype.cpp
@@ -2501,6 +2501,24 @@ unsigned int PClass::Extend(unsigned int extension, unsigned int alignment)
 	return padto;
 }
 
+//==========================================================================
+//
+// PClass :: AddField
+//
+//==========================================================================
+
+PField *PClass::AddField(FName name, PType *type, DWORD flags)
+{
+	unsigned oldsize = Size;
+	PField *field = Super::AddField(name, type, flags);
+	if (field != NULL)
+	{
+		Defaults = (BYTE *)M_Realloc(Defaults, Size);
+		memset(Defaults + oldsize, 0, Size - oldsize);
+	}
+	return field;
+}
+
 //==========================================================================
 //
 // PClass :: FindClassTentative
diff --git a/src/dobjtype.h b/src/dobjtype.h
index e9ff982454..a1fcd13e55 100644
--- a/src/dobjtype.h
+++ b/src/dobjtype.h
@@ -585,7 +585,7 @@ public:
 
 	TArray<PField *> Fields;
 
-	PField *AddField(FName name, PType *type, DWORD flags=0);
+	virtual PField *AddField(FName name, PType *type, DWORD flags=0);
 
 	size_t PropagateMark();
 protected:
@@ -672,6 +672,7 @@ public:
 	PClass *CreateDerivedClass(FName name, unsigned int size);
 	unsigned int Extend(unsigned int extension, unsigned int alignment);
 	unsigned int Extend(const PType *type) { return Extend(type->Size, type->Align); }
+	PField *AddField(FName name, PType *type, DWORD flags=0) override;
 	void InitializeActorInfo();
 	void BuildFlatPointers();
 	const PClass *NativeClass() const;