From: Tomasz Kamiński <tkaminsk@redhat.com>
Date: Fri, 6 Feb 2026 11:03:37 +0000 (+0100)
Subject: libstdc++: Update guards on __heterogeneous_hash_key and __heterogeneous_tree_key
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9b85fcc00ebe850f2ee2c19a0208534544b088a8;p=thirdparty%2Fgcc.git

libstdc++: Update guards on __heterogeneous_hash_key and __heterogeneous_tree_key

The r16-7359-gae04c1afd1526a changed __heterogeneous_key to be
defined if __glibcxx_associative_heterogeneous_erasure, but missed
guards on derived __heterogeneous_hash_key and __heterogeneous_tree_key
concept.

libstdc++-v3/ChangeLog:

	* include/bits/hashtable.h (std::__heterogeneous_hash_key)
	[__glibcxx_associative_heterogeneous_erasure]: Changed guard.
	* include/bits/stl_tree.h (std::__heterogeneous_tree_key)
	[__glibcxx_associative_heterogeneous_erasure]: Likewise.
	* include/bits/stl_function.h: Add comment with C++ version
	for __glibcxx_associative_heterogeneous_erasure guard.
---

diff --git a/libstdc++-v3/include/bits/hashtable.h b/libstdc++-v3/include/bits/hashtable.h
index f7b8905d8ab..48695c013f3 100644
--- a/libstdc++-v3/include/bits/hashtable.h
+++ b/libstdc++-v3/include/bits/hashtable.h
@@ -3012,7 +3012,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       = __enable_if_t<!__or_<is_integral<_Hash>, __is_allocator<_Hash>>::value>;
 #endif
 
-#ifdef __cpp_concepts
+#ifdef __glibcxx_associative_heterogeneous_erasure // C++ >= 23
 template <typename _Kt, typename _Container>
   concept __heterogeneous_hash_key =
     __transparent_comparator<typename _Container::hasher> &&
diff --git a/libstdc++-v3/include/bits/stl_function.h b/libstdc++-v3/include/bits/stl_function.h
index 1312564216b..95c24d44b9e 100644
--- a/libstdc++-v3/include/bits/stl_function.h
+++ b/libstdc++-v3/include/bits/stl_function.h
@@ -1525,7 +1525,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 #endif
 #endif
 
-#ifdef __glibcxx_associative_heterogeneous_erasure
+#ifdef __glibcxx_associative_heterogeneous_erasure // C++ >= 23
 template <typename _Kt, typename _Container>
   concept __not_container_iterator =
     (!is_convertible_v<_Kt&&, typename _Container::iterator> &&
diff --git a/libstdc++-v3/include/bits/stl_tree.h b/libstdc++-v3/include/bits/stl_tree.h
index 7a733241ec5..5d361b55028 100644
--- a/libstdc++-v3/include/bits/stl_tree.h
+++ b/libstdc++-v3/include/bits/stl_tree.h
@@ -3315,7 +3315,7 @@ namespace __rb_tree
     };
 #endif // C++17
 
-#ifdef __cpp_concepts
+#ifdef __glibcxx_associative_heterogeneous_erasure // C++ >= 23
 template <typename _Kt, typename _Container>
   concept __heterogeneous_tree_key =
     __transparent_comparator<typename _Container::key_compare> &&