49 lines
1.3 KiB
C++
49 lines
1.3 KiB
C++
#ifndef CPP_UTILITIES_TRAITS_H
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#define CPP_UTILITIES_TRAITS_H
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#include <type_traits>
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namespace Traits {
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namespace Detail {
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enum class Enabler {};
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}
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template <typename If, typename Then, typename Else>
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using Conditional = typename std::conditional<If::value, Then, Else>::type;
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template <bool B, typename...>
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struct Bool : std::integral_constant<bool, B> {};
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template <typename T>
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using Not = Bool<!T::value>;
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template <typename... T>
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struct Any : Bool<false> {};
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template <typename Head, typename... Tail>
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struct Any<Head, Tail...> : Conditional<Head, Bool<true>, Any<Tail...> > {};
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template <typename... T>
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struct All : Bool<true> {};
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template <typename Head, typename... Tail>
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struct All<Head, Tail...> : Conditional<Head, All<Tail...>, Bool<false> > {};
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template <typename... Condition>
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using EnableIf = typename std::enable_if<All<Condition...>::value, Detail::Enabler>::type;
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template <typename... Condition>
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using DisableIf = typename std::enable_if<!All<Condition...>::value, Detail::Enabler>::type;
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template <typename... Condition>
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using EnableIfAny = typename std::enable_if<Any<Condition...>::value, Detail::Enabler>::type;
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template <typename... Condition>
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using DisableIfAny = typename std::enable_if<!Any<Condition...>::value, Detail::Enabler>::type;
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}
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#endif // CPP_UTILITIES_TRAITS_H
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