AccessDetection.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreTypes.h"
#include "Misc/EnumClassFlags.h"
 
namespace UE { namespace AccessDetection {
 
enum class EType : uint32
{
    None            = 0,
    File            = 1 << 0,
    Ini             = 1 << 1,
    CVar            = 1 << 2,
};
ENUM_CLASS_FLAGS(EType);
 
#if WITH_EDITOR
 
class FScope;
 
namespace Private
{
    extern volatile int32 GNumLiveScopes;
 
    void ReportCurrentThreadAccess(EType Type);
    void SetCurrentThreadScope(FScope* Scope);
}
 
FORCEINLINE void ReportAccess(EType Type)
{
    // Note unsynchronized access is fine - we only need to see writes by current thread
    if (Private::GNumLiveScopes > 0)
    {
        Private::ReportCurrentThreadAccess(Type);
    }
}
 
/** Detects access to global core systems while running deterministic code that should be isolated from the local environment */
class FScope
{
public:
    FScope() { Private::SetCurrentThreadScope(this); }
    ~FScope() { Private::SetCurrentThreadScope(nullptr); }
 
    void AddAccess(EType Type) { AccessedTypes |= Type; }
    EType GetAccesses() const { return AccessedTypes; }
 
private:
    EType AccessedTypes = EType::None;
};
 
#else
 
FORCEINLINE void ReportAccess(EType Type) {}
 
#endif
 
}}