GSLNotNull.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreTypes.h"
#include "Misc/OptionalFwd.h"
#include "Templates/UnrealTemplate.h"
#include <gsl/pointers>
 
class FArchive;
 
template<typename ObjectType>
[[nodiscard]] inline ObjectType* GetRawPointerOrNull(const TOptional<gsl::not_null<ObjectType*>>& Optional)
{
    return Optional.IsSet() ? static_cast<ObjectType*>(Optional.GetValue()) : nullptr;
}
 
template<typename ObjectType>
[[nodiscard]] inline ObjectType* GetRawPointerOrNull(const TOptional<gsl::strict_not_null<ObjectType*>>& Optional)
{
    return Optional.IsSet() ? static_cast<ObjectType*>(Optional.GetValue()) : nullptr;
}
 
 
template<typename ObjectType>
FArchive& operator<<(FArchive& Ar, gsl::not_null<ObjectType>& NotNull)
{
    Ar << *NotNull;
    return Ar;
}
 
template<typename ObjectType>
FArchive& operator<<(FArchive& Ar, gsl::strict_not_null<ObjectType>& NotNull)
{
    Ar << *NotNull;
    return Ar;
}
 
template<typename ObjectType>
[[nodiscard]] inline auto GetTypeHash(const gsl::not_null<ObjectType>& NotNull) -> decltype(GetTypeHash(*NotNull))
{
    return GetTypeHash(*NotNull);
}
 
template<typename ObjectType>
[[nodiscard]] inline auto GetTypeHash(const gsl::strict_not_null<ObjectType>& NotNull) -> decltype(GetTypeHash(*NotNull))
{
    return GetTypeHash(*NotNull);
}