From d251ab647dd4f48603b37b7150627a39e9a30f45 Mon Sep 17 00:00:00 2001
From: Shauren <shauren.trinity@gmail.com>
Date: Sat, 7 Jan 2023 22:38:21 +0100
Subject: Core/Misc: Migrate our c++20 advstd to standard features

(cherry picked from commit 7830e5a7a1b93b0cd083baa3b70a0cfeb475f5f5)
---
 src/common/Utilities/EventProcessor.h               |  3 +--
 src/common/Utilities/Types.h                        |  4 ++--
 src/common/Utilities/advstd.h                       | 17 -----------------
 src/server/game/Chat/ChatCommands/ChatCommand.h     |  3 +--
 src/server/game/Chat/ChatCommands/ChatCommandTags.h |  3 +--
 5 files changed, 5 insertions(+), 25 deletions(-)

(limited to 'src')

diff --git a/src/common/Utilities/EventProcessor.h b/src/common/Utilities/EventProcessor.h
index 2bf68216569..5cb51086891 100644
--- a/src/common/Utilities/EventProcessor.h
+++ b/src/common/Utilities/EventProcessor.h
@@ -18,7 +18,6 @@
 #ifndef __EVENTPROCESSOR_H
 #define __EVENTPROCESSOR_H
 
-#include "advstd.h"
 #include "Define.h"
 #include "Duration.h"
 #include "Random.h"
@@ -89,7 +88,7 @@ private:
 };
 
 template<typename T>
-using is_lambda_event = std::enable_if_t<!std::is_base_of_v<BasicEvent, std::remove_pointer_t<advstd::remove_cvref_t<T>>>>;
+using is_lambda_event = std::enable_if_t<!std::is_base_of_v<BasicEvent, std::remove_pointer_t<std::remove_cvref_t<T>>>>;
 
 class TC_COMMON_API EventProcessor
 {
diff --git a/src/common/Utilities/Types.h b/src/common/Utilities/Types.h
index 223a09c4ee3..922be079de0 100644
--- a/src/common/Utilities/Types.h
+++ b/src/common/Utilities/Types.h
@@ -18,7 +18,7 @@
 #ifndef Types_h__
 #define Types_h__
 
-#include "advstd.h"
+#include <type_traits>
 
 namespace Trinity
 {
@@ -35,7 +35,7 @@ namespace Trinity
     };
 
     template<template<typename...> typename Check, typename T1, typename... Ts>
-    struct find_type_if<Check, T1, Ts...> : std::conditional_t<Check<T1>::value, advstd::type_identity<T1>, find_type_if<Check, Ts...>>
+    struct find_type_if<Check, T1, Ts...> : std::conditional_t<Check<T1>::value, std::type_identity<T1>, find_type_if<Check, Ts...>>
     {
     };
 
diff --git a/src/common/Utilities/advstd.h b/src/common/Utilities/advstd.h
index 2552f7d12bb..ff2717c9755 100644
--- a/src/common/Utilities/advstd.h
+++ b/src/common/Utilities/advstd.h
@@ -18,26 +18,9 @@
 #ifndef TRINITY_ADVSTD_H
 #define TRINITY_ADVSTD_H
 
-#include <cstddef>
-#include <type_traits>
-
 // this namespace holds implementations of upcoming stdlib features that our c++ version doesn't have yet
 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
diff --git a/src/server/game/Chat/ChatCommands/ChatCommand.h b/src/server/game/Chat/ChatCommands/ChatCommand.h
index 9520a7ce7dd..329eecfc567 100644
--- a/src/server/game/Chat/ChatCommands/ChatCommand.h
+++ b/src/server/game/Chat/ChatCommands/ChatCommand.h
@@ -18,7 +18,6 @@
 #ifndef TRINITY_CHATCOMMAND_H
 #define TRINITY_CHATCOMMAND_H
 
-#include "advstd.h"
 #include "ChatCommandArgs.h"
 #include "ChatCommandTags.h"
 #include "Define.h"
@@ -116,7 +115,7 @@ namespace Trinity::Impl::ChatCommands
     }
 
     template <typename T> struct HandlerToTuple { static_assert(Trinity::dependant_false_v<T>, "Invalid command handler signature"); };
-    template <typename... Ts> struct HandlerToTuple<bool(ChatHandler*, Ts...)> { using type = std::tuple<ChatHandler*, advstd::remove_cvref_t<Ts>...>; };
+    template <typename... Ts> struct HandlerToTuple<bool(ChatHandler*, Ts...)> { using type = std::tuple<ChatHandler*, std::remove_cvref_t<Ts>...>; };
     template <typename T> using TupleType = typename HandlerToTuple<T>::type;
 
     struct CommandInvoker
diff --git a/src/server/game/Chat/ChatCommands/ChatCommandTags.h b/src/server/game/Chat/ChatCommands/ChatCommandTags.h
index 0e2b79421c4..b90c614e85d 100644
--- a/src/server/game/Chat/ChatCommands/ChatCommandTags.h
+++ b/src/server/game/Chat/ChatCommands/ChatCommandTags.h
@@ -18,7 +18,6 @@
 #ifndef TRINITY_CHATCOMMANDTAGS_H
 #define TRINITY_CHATCOMMANDTAGS_H
 
-#include "advstd.h"
 #include "ChatCommandHelpers.h"
 #include "Hyperlinks.h"
 #include "ObjectGuid.h"
@@ -213,7 +212,7 @@ namespace Trinity::ChatCommands
     struct Hyperlink : Trinity::Impl::ChatCommands::ContainerTag
     {
         using value_type = typename linktag::value_type;
-        using storage_type = advstd::remove_cvref_t<value_type>;
+        using storage_type = std::remove_cvref_t<value_type>;
 
         operator value_type() const { return val; }
         value_type operator*() const { return val; }
-- 
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