SlateAttributeContained.inl

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include <type_traits>
 
 
class SWidget;
 
 
namespace SlateAttributePrivate
{
    template<typename InObjectType, typename InInvalidationReasonPredicate, typename InComparePredicate>
    struct TSlateContainedAttribute : public TSlateAttributeBase<ISlateAttributeContainer, InObjectType, InInvalidationReasonPredicate, InComparePredicate, ESlateAttributeType::Contained>
    {
    private:
        using Super = TSlateAttributeBase<ISlateAttributeContainer, InObjectType, InInvalidationReasonPredicate, InComparePredicate, ESlateAttributeType::Contained>;
 
        template<typename ContainerType, typename U = typename std::enable_if<std::is_base_of<ISlateAttributeContainer, ContainerType>::value>::type>
        static void VerifyAttributeAddress(const ContainerType& Container, const TSlateContainedAttribute& Self)
        {
            checkf((UPTRINT)&Self >= (UPTRINT)&Container && (UPTRINT)&Self < (UPTRINT)&Container + sizeof(ContainerType),
                TEXT("Use TAttribute or TSlateManagedAttribute instead. See SlateAttribute.h for more info."));
            static_assert(!Super::HasDefinedInvalidationReason, "Define the Invalidation Reason in SlateAttributeDescriptor.");
        }
 
    public:
        using FGetter = typename Super::FGetter;
        using ObjectType = typename Super::ObjectType;
 
    public:
        //~ You can only register Attribute that are defined in a ISlateAttributeContainerOwner.
        //~ Use the constructor with a ISlateAttributeContainerOwner pointer.
        //~ See documentation in SlateAttribute.h for more info.
        TSlateContainedAttribute() = delete;
        TSlateContainedAttribute(const TSlateContainedAttribute&) = delete;
        TSlateContainedAttribute(TSlateContainedAttribute&&) = delete;
        TSlateContainedAttribute& operator=(const TSlateContainedAttribute&) = delete;
        TSlateContainedAttribute& operator=(TSlateContainedAttribute&&) = delete;
 
        template<typename ContainerType, typename U = typename std::enable_if<std::is_base_of<ISlateAttributeContainer, ContainerType>::value>::type>
        explicit TSlateContainedAttribute(ContainerType& Container)
        {
            VerifyAttributeAddress(Container, *this);
        }
 
        template<typename ContainerType, typename U = typename std::enable_if<std::is_base_of<ISlateAttributeContainer, ContainerType>::value>::type>
        explicit TSlateContainedAttribute(ContainerType& Container, const ObjectType& InValue)
            : Super(InValue)
        {
            VerifyAttributeAddress(Container, *this);
        }
 
        template<typename ContainerType, typename U = typename std::enable_if<std::is_base_of<ISlateAttributeContainer, ContainerType>::value>::type>
        explicit TSlateContainedAttribute(ContainerType& Container, ObjectType&& InValue)
            : Super(MoveTemp(InValue))
        {
            VerifyAttributeAddress(Container, *this);
        }
    };
} // SlateAttributePrivate