Most of these are implemented by vst2wrapper

public.sdk/source/vst2.x/aeffeditor.cpp

@@ -19,11 +19,6 @@ AEffEditor::AEffEditor(AudioEffect* effect) : effect(effect), _handle() {}
 
 AEffEditor::~AEffEditor() {}
 
-bool AEffEditor::getRect(ERect** rect)
-{
-	return false;
-}
-
 bool AEffEditor::open(void* ptr)
 {
 	if (!_handle) {
@@ -38,28 +33,3 @@ void AEffEditor::close()
 	_handle = nullptr;
 	return;
 }
-
-void AEffEditor::do_nothing()
-{
-	return;
-}
-
-bool AEffEditor::setKnobMode(VstInt32 val)
-{
-	return false;
-}
-
-bool AEffEditor::onKeyDown(VstKeyCode& keyCode)
-{
-	return false;
-}
-
-bool AEffEditor::onKeyUp(VstKeyCode& keyCode)
-{
-	return false;
-}
-
-bool AEffEditor::onWheel(float distance)
-{
-	return false;
-}

public.sdk/source/vst2.x/aeffeditor.hpp

@@ -26,16 +26,35 @@ class AEffEditor {
 	AEffEditor(AudioEffect* effect);
 	virtual ~AEffEditor();
 
-	virtual bool getRect(ERect** rect);
+	virtual bool getRect(ERect** rect)
+	{
+		*rect = nullptr;
+		return false;
+	}
 	virtual bool open(void* ptr);
 	virtual void close();
-	virtual void do_nothing();
+	virtual void do_nothing()
+	{
+		return;
+	}
 
 #if (!defined VST_VERSION_SUPPORT) || (VST_VERSION_SUPPORT >= kVstVersion_2100)
-	virtual bool setKnobMode(VstInt32 val);
-	virtual bool onKeyDown(VstKeyCode& keyCode);
-	virtual bool onKeyUp(VstKeyCode& keyCode);
-	virtual bool onWheel(float distance);
+	virtual bool setKnobMode(VstInt32 val)
+	{
+		return false;
+	}
+	virtual bool onKeyDown(VstKeyCode& keyCode)
+	{
+		return false;
+	}
+	virtual bool onKeyUp(VstKeyCode& keyCode)
+	{
+		return false;
+	}
+	virtual bool onWheel(float distance)
+	{
+		return false;
+	}
 #endif
 
 	protected: