Unique.hpp

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//
//  CeresEngine - A game development framework
//
//  Created by Rogiel Sulzbach.
//  Copyright (c) 2018-2022 Rogiel Sulzbach. All rights reserved.
//
 
#pragma once
 
#include "Count.hpp"
#include "TypeList.hpp"
 
#include <type_traits>
 
namespace CeresEngine::MPL {
 
    template<typename TTypeList> struct UniqueHelper : std::true_type {};
 
    template<typename... Ts> inline constexpr bool Unique = UniqueHelper<TypeList<Ts...>>::value;
 
    template<typename T, typename... Ts>
    struct UniqueHelper<TypeList<T, Ts...>> : std::integral_constant<bool, (Count<T, TypeList<T, Ts...>> <= 1) && UniqueHelper<TypeList<Ts...>>::value> {};
 
} // namespace CeresEngine::MPL