MassExternalSubsystemTraits.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#if UE_ENABLE_INCLUDE_ORDER_DEPRECATED_IN_5_6
#include "Engine/World.h"
#include "Subsystems/WorldSubsystem.h"
#endif // UE_ENABLE_INCLUDE_ORDER_DEPRECATED_IN_5_6
 
template <typename T>
struct TMassExternalSubsystemTraits final
{
    enum
    {
        // Unless configured otherwise each subsystem will be treated as "game-thread only".
        GameThreadOnly = true,
 
        // If set to true all RW and RO operations will be viewed as RO when calculating processor dependencies
        ThreadSafeWrite = !GameThreadOnly,
    };
};
 
template <typename T>
struct TMassSharedFragmentTraits final
{
    enum
    {
        GameThreadOnly = false,
        ThreadSafeWrite = false,
    };
};
 
template <typename T>
struct TMassFragmentTraits final
{
    enum
    {
        // Fragment types are best kept trivially copyable for performance reasons.
        // To enforce that we test this trait when checking if a given type is a valid fragment type.
        // This test can be skipped by specifically opting out, which also documents that 
        // making the given type non-trivially-copyable was a deliberate decision. 
        AuthorAcceptsItsNotTriviallyCopyable = false
    };
};