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