From af33fb7171ad94b9ac90eedc9f87b4ef68e29f71 Mon Sep 17 00:00:00 2001
From: Corentin Jabot <corentinjabot@gmail.com>
Date: Wed, 9 Oct 2024 20:32:29 +0200
Subject: [PATCH] only optimize swap for std::alocator

---
 libcxx/include/string | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libcxx/include/string b/libcxx/include/string
index 89953d839abd9a..4de733e83942a4 100644
--- a/libcxx/include/string
+++ b/libcxx/include/string
@@ -751,7 +751,7 @@ struct __init_with_sentinel_tag {};
 
 template <class _CharT, class _Traits, class _Allocator>
 class basic_string memberwise_trivially_relocatable
-      memberwise_replaceable {
+                   memberwise_replaceable {
 
 private:
   using __default_allocator_type = allocator<_CharT>;
@@ -3449,7 +3449,7 @@ inline _LIBCPP_CONSTEXPR_SINCE_CXX20 void basic_string<_CharT, _Traits, _Allocat
 {
 
 #if _LIBCPP_STD_VER >= 26
-  if constexpr(__alloc_traits::is_always_equal::value) {
+  if constexpr(std::is_same_v<allocator_type, allocator<_CharT>>) {
     std::swap_value_representations(*this, __str);
     return;
   }