ElementType.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "HAL/Platform.h"
#include <initializer_list>
#include <type_traits>
 
namespace UE::Core::Private::ElementType
{
 
template <typename T, typename = void>
struct TImpl
{
};
 
template <typename T>
struct TImpl<T, std::void_t<typename T::ElementType>>
{
    using Type = typename T::ElementType;
};
 
} // UE::Core::Private::ElementType
 
template <typename T>
struct TElementType : UE::Core::Private::ElementType::TImpl<T>
{
};
 
template <typename T> struct TElementType<             T& > : TElementType<T> {};
template <typename T> struct TElementType<             T&&> : TElementType<T> {};
template <typename T> struct TElementType<const          T> : TElementType<T> {};
template <typename T> struct TElementType<      volatile T> : TElementType<T> {};
template <typename T> struct TElementType<const volatile T> : TElementType<T> {};
 
template <typename T, size_t N> struct TElementType<               T[N]> { using Type = T; };
template <typename T, size_t N> struct TElementType<const          T[N]> { using Type = T; };
template <typename T, size_t N> struct TElementType<      volatile T[N]> { using Type = T; };
template <typename T, size_t N> struct TElementType<const volatile T[N]> { using Type = T; };
 
template <typename T>
struct TElementType<std::initializer_list<T>>
{
    using Type = std::remove_cv_t<T>;
};
 
template <typename T>
using TElementType_T = typename TElementType<T>::Type;