AndOrNot.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreTypes.h"
 
template <typename... Types>
struct TAnd;
 
template <bool LHSValue, typename... RHS>
struct TAndValue
{
    static constexpr bool Value = TAnd<RHS...>::value;
    static constexpr bool value = TAnd<RHS...>::value;
};
 
template <typename... RHS>
struct TAndValue<false, RHS...>
{
    static constexpr bool Value = false;
    static constexpr bool value = false;
};
 
template <typename LHS, typename... RHS>
struct TAnd<LHS, RHS...> : TAndValue<LHS::Value, RHS...>
{
};
 
template <>
struct TAnd<>
{
    static constexpr bool Value = true;
    static constexpr bool value = true;
};
 
template <typename... Types>
struct TOr;
 
template <bool LHSValue, typename... RHS>
struct TOrValue
{
    static constexpr bool Value = TOr<RHS...>::value;
    static constexpr bool value = TOr<RHS...>::value;
};
 
template <typename... RHS>
struct TOrValue<true, RHS...>
{
    static constexpr bool Value = true;
    static constexpr bool value = true;
};
 
template <typename LHS, typename... RHS>
struct TOr<LHS, RHS...> : TOrValue<LHS::Value, RHS...>
{
};
 
template <>
struct TOr<>
{
    static constexpr bool Value = false;
    static constexpr bool value = false;
};
 
template <typename Type>
struct TNot
{
    static constexpr bool Value = !Type::Value;
    static constexpr bool value = !Type::Value;
};