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Core/Util: Added new utilities

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* Trinity::new_from_tuple - same as std::make_from_tuple except allocates object using "new"
* Trinity::is_tuple - detects whether given type is a tuple specialization
* advstd::type_identity - C++20 std::type_identity
This commit is contained in:
Shauren
2020-08-20 13:34:45 +02:00
parent 7bfeb03c13
commit 7c08fc863a
2 changed files with 42 additions and 0 deletions
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31
src/common/Utilities/Tuples.h
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@@ -29,6 +29,37 @@ namespace Trinity
struct has_type<T, std::tuple<Us...>> : std::disjunction<std::is_same<T, Us>...>
{
};
template <typename T, typename... Us>
constexpr bool has_type_v = has_type<T, Us...>::value;
template<typename>
struct is_tuple : std::false_type
{
};
template<typename... Ts>
struct is_tuple<std::tuple<Ts...>> : std::true_type
{
};
template<typename... Ts>
constexpr bool is_tuple_v = is_tuple<Ts...>::value;
namespace Impl
{
template <class T, class Tuple, size_t... I>
T* new_from_tuple(Tuple&& args, std::index_sequence<I...>)
{
return new T(std::get<I>(std::forward<Tuple>(args))...);
}
}
template<class T, class Tuple>
[[nodiscard]] T* new_from_tuple(Tuple&& args)
{
return Impl::new_from_tuple<T>(std::forward<Tuple>(args), std::make_index_sequence<std::tuple_size_v<std::remove_reference_t<Tuple>>>{});
}
}
#endif // Tuples_h__

11
src/common/Utilities/advstd.h
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@@ -27,6 +27,17 @@ namespace advstd
// C++20 advstd::remove_cvref_t
template <class T>
using remove_cvref_t = std::remove_cv_t<std::remove_reference_t<T>>;
// C++20 std::type_identity
template <typename T>
struct type_identity
{
using type = T;
};
// C++20 std::type_identity_t
template <typename T>
using type_identity_t = typename type_identity<T>::type;
}
#endif