From 7c08fc863ac45f2d41b18103b0132004a4c0c524 Mon Sep 17 00:00:00 2001
From: Shauren <shauren.trinity@gmail.com>
Date: Thu, 20 Aug 2020 13:34:45 +0200
Subject: Core/Util: Added new utilities

* 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
---
 src/common/Utilities/Tuples.h | 31 +++++++++++++++++++++++++++++++
 src/common/Utilities/advstd.h | 11 +++++++++++
 2 files changed, 42 insertions(+)

(limited to 'src')

diff --git a/src/common/Utilities/Tuples.h b/src/common/Utilities/Tuples.h
index 73337ebd9f5..8b608fd8901 100644
--- a/src/common/Utilities/Tuples.h
+++ b/src/common/Utilities/Tuples.h
@@ -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__
diff --git a/src/common/Utilities/advstd.h b/src/common/Utilities/advstd.h
index fc8221b7314..2552f7d12bb 100644
--- a/src/common/Utilities/advstd.h
+++ b/src/common/Utilities/advstd.h
@@ -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
-- 
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