IsImplicitlyConstructible.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include <type_traits>
 
namespace UE::Core::Private
{
    template <typename T, typename... ArgTypes>
    struct TIsImplicitlyConstructibleImpl
    {
        template <typename U>
        static void TakesU(U&&);
 
        static constexpr bool value = (!std::is_aggregate_v<T> || sizeof...(ArgTypes) == 0) && requires{ TakesU<T>({ std::declval<ArgTypes>()... }); };
    };
    template <typename T, typename ArgType>
    struct TIsImplicitlyConstructibleImpl<T, ArgType>
    {
        static constexpr bool value = std::is_convertible_v<ArgType, T>;
        static constexpr bool Value = value;
    };
}
 
template <typename T, typename... ArgTypes>
struct TIsImplicitlyConstructible : UE::Core::Private::TIsImplicitlyConstructibleImpl<T, ArgTypes...>
{
};
 
template <typename T, typename... ArgTypes>
inline constexpr bool TIsImplicitlyConstructible_V = UE::Core::Private::TIsImplicitlyConstructibleImpl<T, ArgTypes...>::value;