45 lines
1.6 KiB
C++
45 lines
1.6 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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/// \brief Contains traits for conveniently exploiting SFINAE.
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namespace Traits {
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/// \cond
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namespace Detail {
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enum class Enabler {};
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}
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/// \endcond
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template <typename If, typename Then, typename Else> using Conditional = typename std::conditional<If::value, Then, Else>::type;
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template <bool B, typename...> struct Bool : std::integral_constant<bool, B> {
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};
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template <typename T> using Not = Bool<!T::value>;
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template <typename... T> struct Any : Bool<false> {
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};
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template <typename Head, typename... Tail> struct Any<Head, Tail...> : Conditional<Head, Bool<true>, Any<Tail...> > {
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};
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template <typename... T> struct All : Bool<true> {
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};
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template <typename Head, typename... Tail> struct All<Head, Tail...> : Conditional<Head, All<Tail...>, Bool<false> > {
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};
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template <typename... Condition> using EnableIf = typename std::enable_if<All<Condition...>::value, Detail::Enabler>::type;
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template <typename... Condition> using DisableIf = typename std::enable_if<!All<Condition...>::value, Detail::Enabler>::type;
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template <typename... Condition> using EnableIfAny = typename std::enable_if<Any<Condition...>::value, Detail::Enabler>::type;
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template <typename... Condition> using DisableIfAny = typename std::enable_if<!Any<Condition...>::value, Detail::Enabler>::type;
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template <typename T, template <typename...> class Template> struct IsSpecializationOf : Bool<false> {
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};
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template <template <typename...> class Template, typename... Args> struct IsSpecializationOf<Template<Args...>, Template> : Bool<true> {
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};
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}
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#endif // CPP_UTILITIES_TRAITS_H
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