From 089d2db1048861912eb50cfcb4b51d13eeffa0de Mon Sep 17 00:00:00 2001
From: LeonineKing1199 <christian.mazakas@gmail.com>
Date: Wed, 8 Dec 2021 14:04:04 -0800
Subject: [PATCH] Remove traits detection mechanism

---
 .../boost/unordered/detail/implementation.hpp | 72 -------------------
 1 file changed, 72 deletions(-)

diff --git a/include/boost/unordered/detail/implementation.hpp b/include/boost/unordered/detail/implementation.hpp
index 97922941..b65d4bc0 100644
--- a/include/boost/unordered/detail/implementation.hpp
+++ b/include/boost/unordered/detail/implementation.hpp
@@ -844,78 +844,6 @@ namespace boost {
   }
 }
 
-////////////////////////////////////////////////////////////////////////////
-// TRAITS TYPE DETECTION MECHANISM
-//
-// Used to implement traits that use a type if present, or a
-// default otherwise.
-
-#if defined(BOOST_MSVC) && BOOST_MSVC <= 1400
-
-#define BOOST_UNORDERED_DEFAULT_TYPE_TMPLT(tname)                              \
-  template <typename Tp, typename Default> struct default_type_##tname         \
-  {                                                                            \
-                                                                               \
-    template <typename X>                                                      \
-    static choice1::type test(choice1, typename X::tname* = 0);                \
-                                                                               \
-    template <typename X> static choice2::type test(choice2, void* = 0);       \
-                                                                               \
-    struct DefaultWrap                                                         \
-    {                                                                          \
-      typedef Default tname;                                                   \
-    };                                                                         \
-                                                                               \
-    enum                                                                       \
-    {                                                                          \
-      value = (1 == sizeof(test<Tp>(choose())))                                \
-    };                                                                         \
-                                                                               \
-    typedef typename boost::detail::if_true<value>::BOOST_NESTED_TEMPLATE      \
-      then<Tp, DefaultWrap>::type::tname type;                                 \
-  }
-
-#else
-
-namespace boost {
-  namespace unordered {
-    namespace detail {
-      template <typename T, typename T2> struct sfinae : T2
-      {
-      };
-    }
-  }
-}
-
-#define BOOST_UNORDERED_DEFAULT_TYPE_TMPLT(tname)                              \
-  template <typename Tp, typename Default> struct default_type_##tname         \
-  {                                                                            \
-                                                                               \
-    template <typename X>                                                      \
-    static typename boost::unordered::detail::sfinae<typename X::tname,        \
-      choice1>::type test(choice1);                                            \
-                                                                               \
-    template <typename X> static choice2::type test(choice2);                  \
-                                                                               \
-    struct DefaultWrap                                                         \
-    {                                                                          \
-      typedef Default tname;                                                   \
-    };                                                                         \
-                                                                               \
-    enum                                                                       \
-    {                                                                          \
-      value = (1 == sizeof(test<Tp>(choose())))                                \
-    };                                                                         \
-                                                                               \
-    typedef typename boost::detail::if_true<value>::BOOST_NESTED_TEMPLATE      \
-      then<Tp, DefaultWrap>::type::tname type;                                 \
-  }
-
-#endif
-
-#define BOOST_UNORDERED_DEFAULT_TYPE(T, tname, arg)                            \
-  typename default_type_##tname<T, arg>::type
-
 ////////////////////////////////////////////////////////////////////////////////
 //
 // Allocator traits