Revert "[libc++] Refactor key extraction for __hash_table and __tree (#154512)"

This reverts commit af1f06e41b05c267480f1629dc0fcdf18f3b59f6.

This is causing some build failures in premerge as some of the LLDB
tests fail.

1 files changed, 0 insertions, 114 deletions

diff --git a/libcxx/include/__utility/try_key_extraction.h b/libcxx/include/__utility/try_key_extraction.h
deleted file mode 100644
index 755c082..0000000
--- a/libcxx/include/__utility/try_key_extraction.h
+++ /dev/null
@@ -1,114 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef _LIBCPP___UTILITY_TRY_EXTRACT_KEY_H
-#define _LIBCPP___UTILITY_TRY_EXTRACT_KEY_H
-
-#include <__config>
-#include <__fwd/pair.h>
-#include <__fwd/tuple.h>
-#include <__type_traits/enable_if.h>
-#include <__type_traits/is_same.h>
-#include <__type_traits/remove_const.h>
-#include <__type_traits/remove_const_ref.h>
-#include <__utility/declval.h>
-#include <__utility/forward.h>
-#include <__utility/piecewise_construct.h>
-#include <__utility/priority_tag.h>
-
-#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
-#  pragma GCC system_header
-#endif
-
-_LIBCPP_BEGIN_NAMESPACE_STD
-
-template <class _KeyT, class _Ret, class _WithKey, class _WithoutKey, class... _Args>
-_LIBCPP_HIDE_FROM_ABI _Ret
-__try_key_extraction_impl(__priority_tag<0>, _WithKey, _WithoutKey __without_key, _Args&&... __args) {
-  return __without_key(std::forward<_Args>(__args)...);
-}
-
-template <class _KeyT,
-          class _Ret,
-          class _WithKey,
-          class _WithoutKey,
-          class _Arg,
-          __enable_if_t<is_same<_KeyT, __remove_const_ref_t<_Arg> >::value, int> = 0>
-_LIBCPP_HIDE_FROM_ABI _Ret
-__try_key_extraction_impl(__priority_tag<1>, _WithKey __with_key, _WithoutKey, _Arg&& __arg) {
-  return __with_key(__arg, std::forward<_Arg>(__arg));
-}
-
-template <class _KeyT,
-          class _Ret,
-          class _WithKey,
-          class _WithoutKey,
-          class _Arg,
-          __enable_if_t<__is_pair_v<__remove_const_ref_t<_Arg> > &&
-                            is_same<__remove_const_t<typename __remove_const_ref_t<_Arg>::first_type>, _KeyT>::value,
-                        int> = 0>
-_LIBCPP_HIDE_FROM_ABI _Ret
-__try_key_extraction_impl(__priority_tag<1>, _WithKey __with_key, _WithoutKey, _Arg&& __arg) {
-  return __with_key(__arg.first, std::forward<_Arg>(__arg));
-}
-
-template <class _KeyT,
-          class _Ret,
-          class _WithKey,
-          class _WithoutKey,
-          class _Arg1,
-          class _Arg2,
-          __enable_if_t<is_same<_KeyT, __remove_const_ref_t<_Arg1> >::value, int> = 0>
-_LIBCPP_HIDE_FROM_ABI _Ret
-__try_key_extraction_impl(__priority_tag<1>, _WithKey __with_key, _WithoutKey, _Arg1&& __arg1, _Arg2&& __arg2) {
-  return __with_key(__arg1, std::forward<_Arg1>(__arg1), std::forward<_Arg2>(__arg2));
-}
-
-#ifndef _LIBCPP_CXX03_LANG
-template <class _KeyT,
-          class _Ret,
-          class _WithKey,
-          class _WithoutKey,
-          class _PiecewiseConstruct,
-          class _Tuple1,
-          class _Tuple2,
-          __enable_if_t<is_same<__remove_const_ref_t<_PiecewiseConstruct>, piecewise_construct_t>::value &&
-                            __is_tuple_v<_Tuple1> && tuple_size<_Tuple1>::value == 1 &&
-                            is_same<__remove_const_ref_t<typename tuple_element<0, _Tuple1>::type>, _KeyT>::value,
-                        int> = 0>
-_LIBCPP_HIDE_FROM_ABI _Ret __try_key_extraction_impl(
-    __priority_tag<1>,
-    _WithKey __with_key,
-    _WithoutKey,
-    _PiecewiseConstruct&& __pc,
-    _Tuple1&& __tuple1,
-    _Tuple2&& __tuple2) {
-  return __with_key(
-      std::get<0>(__tuple1),
-      std::forward<_PiecewiseConstruct>(__pc),
-      std::forward<_Tuple1>(__tuple1),
-      std::forward<_Tuple2>(__tuple2));
-}
-#endif // _LIBCPP_CXX03_LANG
-
-// This function tries extracting the given _KeyT from _Args...
-// If it succeeds to extract the key, it calls the `__with_key` function with the extracted key and all of the
-// arguments. Otherwise it calls the `__without_key` function with all of the arguments.
-//
-// Both `__with_key` and `__without_key` must take all arguments by reference.
-template <class _KeyT, class _WithKey, class _WithoutKey, class... _Args>
-_LIBCPP_HIDE_FROM_ABI decltype(std::declval<_WithoutKey>()(std::declval<_Args>()...))
-__try_key_extraction(_WithKey __with_key, _WithoutKey __without_key, _Args&&... __args) {
-  using _Ret = decltype(__without_key(std::forward<_Args>(__args)...));
-  return std::__try_key_extraction_impl<_KeyT, _Ret>(
-      __priority_tag<1>(), __with_key, __without_key, std::forward<_Args>(__args)...);
-}
-
-_LIBCPP_END_NAMESPACE_STD
-
-#endif // _LIBCPP___UTILITY_TRY_EXTRACT_KEY_H