[libcxx-commits] [libcxx] [libc++] Add missing constructor for forward_list in C++11 (PR #204845)

[via libcxx-commits]

https://github.com/halbi2 created https://github.com/llvm/llvm-project/pull/204845

https://en.cppreference.com/cpp/container/forward_list/forward_list
Fixes #204843

>From c7bb1403282a0c0d89b1bae0cccdadecf9c70345 Mon Sep 17 00:00:00 2001
From: halbi2 <hehiralbi at gmail.com>
Date: Fri, 19 Jun 2026 10:55:49 -0400
Subject: [PATCH] [libc++] Add missing constructor for forward_list

Fixes #204843
---
 libcxx/include/forward_list                                 | 6 +-----
 .../sequences/forwardlist/forwardlist.cons/size.pass.cpp    | 2 +-
 2 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/libcxx/include/forward_list b/libcxx/include/forward_list
index 6d86f7a8e5975..d963fea6084ca 100644
--- a/libcxx/include/forward_list
+++ b/libcxx/include/forward_list
@@ -37,7 +37,7 @@ public:
         noexcept(is_nothrow_default_constructible<allocator_type>::value);
     explicit forward_list(const allocator_type& a);
     explicit forward_list(size_type n);
-    explicit forward_list(size_type n, const allocator_type& a); // C++14
+    explicit forward_list(size_type n, const allocator_type& a);
     forward_list(size_type n, const value_type& v);
     forward_list(size_type n, const value_type& v, const allocator_type& a);
     template <class InputIterator>
@@ -664,9 +664,7 @@ public:
       _NOEXCEPT_(is_nothrow_default_constructible<__node_allocator>::value) {} // = default;
   _LIBCPP_CONSTEXPR_SINCE_CXX26 _LIBCPP_HIDE_FROM_ABI explicit forward_list(const allocator_type& __a);
   _LIBCPP_CONSTEXPR_SINCE_CXX26 _LIBCPP_HIDE_FROM_ABI explicit forward_list(size_type __n);
-#  if _LIBCPP_STD_VER >= 14
   _LIBCPP_CONSTEXPR_SINCE_CXX26 _LIBCPP_HIDE_FROM_ABI explicit forward_list(size_type __n, const allocator_type& __a);
-#  endif
   _LIBCPP_CONSTEXPR_SINCE_CXX26 _LIBCPP_HIDE_FROM_ABI forward_list(size_type __n, const value_type& __v);
 
   template <__enable_if_t<__is_allocator_v<_Alloc>, int> = 0>
@@ -941,7 +939,6 @@ _LIBCPP_CONSTEXPR_SINCE_CXX26 forward_list<_Tp, _Alloc>::forward_list(size_type
   }
 }
 
-#  if _LIBCPP_STD_VER >= 14
 template <class _Tp, class _Alloc>
 _LIBCPP_CONSTEXPR_SINCE_CXX26 forward_list<_Tp, _Alloc>::forward_list(size_type __n, const allocator_type& __base_alloc)
     : __base(__base_alloc) {
@@ -952,7 +949,6 @@ _LIBCPP_CONSTEXPR_SINCE_CXX26 forward_list<_Tp, _Alloc>::forward_list(size_type
     }
   }
 }
-#  endif
 
 template <class _Tp, class _Alloc>
 _LIBCPP_CONSTEXPR_SINCE_CXX26 forward_list<_Tp, _Alloc>::forward_list(size_type __n, const value_type& __v) {
diff --git a/libcxx/test/std/containers/sequences/forwardlist/forwardlist.cons/size.pass.cpp b/libcxx/test/std/containers/sequences/forwardlist/forwardlist.cons/size.pass.cpp
index 206854560c19f..2cfd829a1eb23 100644
--- a/libcxx/test/std/containers/sequences/forwardlist/forwardlist.cons/size.pass.cpp
+++ b/libcxx/test/std/containers/sequences/forwardlist/forwardlist.cons/size.pass.cpp
@@ -21,7 +21,7 @@
 
 template <class T, class Allocator>
 void check_allocator(unsigned n, Allocator const& alloc = Allocator()) {
-#if TEST_STD_VER > 11
+#if TEST_STD_VER >= 11
   typedef std::forward_list<T, Allocator> C;
   C d(n, alloc);
   assert(d.get_allocator() == alloc);