[libcxx-commits] [libcxx] [libc++] Revert temporary attempt to implement LWG 4110 (PR #95263)
Louis Dionne via libcxx-commits
libcxx-commits at lists.llvm.org
Thu Jun 13 12:31:00 PDT 2024
https://github.com/ldionne updated https://github.com/llvm/llvm-project/pull/95263
>From ad868137f19ba4ac0ccb1c144a935e4ba8ce3d33 Mon Sep 17 00:00:00 2001
From: Louis Dionne <ldionne.2 at gmail.com>
Date: Wed, 12 Jun 2024 11:37:40 -0400
Subject: [PATCH] [libc++] Revert temporary attempt to implement LWG 4110
When I filed LWG4110 after the discussion in #93071, I thought it was
going to be a straightforward fix. It turns out that it isn't, so we
should stay in the state where libc++ is Standards conforming even if
that state leads to some reasonable code being rejected by the library.
Once WG21 figures out what to do with this issue and votes on it, we'll
implement it through our normal means.
This reverts f638f7b6a7c2 and 16f2aa1a2ddf.
---
libcxx/docs/Status/Cxx2cIssues.csv | 1 -
libcxx/include/__memory/shared_ptr.h | 2 +-
.../nullptr_t_deleter.pass.cpp | 7 ++++---
.../nullptr_t_deleter_allocator.pass.cpp | 12 ++++--------
.../pointer_deleter.pass.cpp | 8 --------
.../pointer_deleter_allocator.pass.cpp | 8 --------
6 files changed, 9 insertions(+), 29 deletions(-)
diff --git a/libcxx/docs/Status/Cxx2cIssues.csv b/libcxx/docs/Status/Cxx2cIssues.csv
index 28359b7bb49ac..8d24457186310 100644
--- a/libcxx/docs/Status/Cxx2cIssues.csv
+++ b/libcxx/docs/Status/Cxx2cIssues.csv
@@ -65,5 +65,4 @@
"`3343 <https://wg21.link/LWG3343>`__","Ordering of calls to ``unlock()`` and ``notify_all()`` in Effects element of ``notify_all_at_thread_exit()`` should be reversed","Not Yet Adopted","|Complete|","16.0",""
"XXXX","","The sys_info range should be affected by save","Not Yet Adopted","|Complete|","19.0"
"`4071 <https://wg21.link/LWG4071>`__","","``reference_wrapper`` comparisons are not SFINAE-friendly","Not Yet Adopted","|Complete|","19.0"
-"`4110 <https://wg21.link/LWG4110>`__","","``shared_ptr(nullptr_t, Deleter)`` is overconstrained, breaking some sensible deleters","Not Yet Adopted","|Complete|","19.0"
"","","","","",""
diff --git a/libcxx/include/__memory/shared_ptr.h b/libcxx/include/__memory/shared_ptr.h
index 7b5002cb95d32..00db96185be7c 100644
--- a/libcxx/include/__memory/shared_ptr.h
+++ b/libcxx/include/__memory/shared_ptr.h
@@ -404,7 +404,7 @@ struct __shared_ptr_deleter_ctor_reqs {
};
template <class _Dp, class _Tp>
-using __shared_ptr_nullptr_deleter_ctor_reqs = _And<is_move_constructible<_Dp>, __well_formed_deleter<_Dp, _Tp*> >;
+using __shared_ptr_nullptr_deleter_ctor_reqs = _And<is_move_constructible<_Dp>, __well_formed_deleter<_Dp, nullptr_t> >;
#if defined(_LIBCPP_ABI_ENABLE_SHARED_PTR_TRIVIAL_ABI)
# define _LIBCPP_SHARED_PTR_TRIVIAL_ABI __attribute__((__trivial_abi__))
diff --git a/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/nullptr_t_deleter.pass.cpp b/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/nullptr_t_deleter.pass.cpp
index 4ea752b36bd01..13340ed5294c0 100644
--- a/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/nullptr_t_deleter.pass.cpp
+++ b/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/nullptr_t_deleter.pass.cpp
@@ -32,16 +32,17 @@ int A::count = 0;
// LWG 3233. Broken requirements for shared_ptr converting constructors
// https://cplusplus.github.io/LWG/issue3233
static_assert( std::is_constructible<std::shared_ptr<int>, std::nullptr_t, test_deleter<int> >::value, "");
-static_assert(!std::is_constructible<std::shared_ptr<int>, std::nullptr_t, bad_deleter>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<int>, std::nullptr_t, bad_deleter>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<int>, std::nullptr_t, no_nullptr_deleter>::value, "");
static_assert(!std::is_constructible<std::shared_ptr<int>, std::nullptr_t, no_move_deleter>::value, "");
#if TEST_STD_VER >= 17
-static_assert(std::is_constructible<std::shared_ptr<int[]>, std::nullptr_t, test_deleter<int[]> >::value, "");
+static_assert( std::is_constructible<std::shared_ptr<int[]>, std::nullptr_t, test_deleter<int> >::value, "");
static_assert(!std::is_constructible<std::shared_ptr<int[]>, std::nullptr_t, bad_deleter>::value, "");
static_assert(!std::is_constructible<std::shared_ptr<int[]>, std::nullptr_t, no_nullptr_deleter>::value, "");
static_assert(!std::is_constructible<std::shared_ptr<int[]>, std::nullptr_t, no_move_deleter>::value, "");
-static_assert(std::is_constructible<std::shared_ptr<int[5]>, std::nullptr_t, test_deleter<int[5]> >::value, "");
+static_assert( std::is_constructible<std::shared_ptr<int[5]>, std::nullptr_t, test_deleter<int> >::value, "");
static_assert(!std::is_constructible<std::shared_ptr<int[5]>, std::nullptr_t, bad_deleter>::value, "");
static_assert(!std::is_constructible<std::shared_ptr<int[5]>, std::nullptr_t, no_nullptr_deleter>::value, "");
static_assert(!std::is_constructible<std::shared_ptr<int[5]>, std::nullptr_t, no_move_deleter>::value, "");
diff --git a/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/nullptr_t_deleter_allocator.pass.cpp b/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/nullptr_t_deleter_allocator.pass.cpp
index a479b24c4595a..53ca6fb5b234d 100644
--- a/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/nullptr_t_deleter_allocator.pass.cpp
+++ b/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/nullptr_t_deleter_allocator.pass.cpp
@@ -33,21 +33,17 @@ int A::count = 0;
// LWG 3233. Broken requirements for shared_ptr converting constructors
// https://cplusplus.github.io/LWG/issue3233
static_assert( std::is_constructible<std::shared_ptr<int>, std::nullptr_t, test_deleter<int>, test_allocator<int> >::value, "");
-static_assert(!std::is_constructible<std::shared_ptr<int>, std::nullptr_t, bad_deleter, test_allocator<int> >::value,
- "");
+static_assert(!std::is_constructible<std::shared_ptr<int>, std::nullptr_t, bad_deleter, test_allocator<int> >::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<int>, std::nullptr_t, no_nullptr_deleter, test_allocator<int> >::value, "");
static_assert(!std::is_constructible<std::shared_ptr<int>, std::nullptr_t, no_move_deleter, test_allocator<int> >::value, "");
#if TEST_STD_VER >= 17
-static_assert(
- std::is_constructible<std::shared_ptr<int[]>, std::nullptr_t, test_deleter<int[]>, test_allocator<int> >::value,
- "");
+static_assert( std::is_constructible<std::shared_ptr<int[]>, std::nullptr_t, test_deleter<int>, test_allocator<int> >::value, "");
static_assert(!std::is_constructible<std::shared_ptr<int[]>, std::nullptr_t, bad_deleter, test_allocator<int> >::value, "");
static_assert(!std::is_constructible<std::shared_ptr<int[]>, std::nullptr_t, no_nullptr_deleter, test_allocator<int> >::value, "");
static_assert(!std::is_constructible<std::shared_ptr<int[]>, std::nullptr_t, no_move_deleter, test_allocator<int> >::value, "");
-static_assert(
- std::is_constructible<std::shared_ptr<int[5]>, std::nullptr_t, test_deleter<int[5]>, test_allocator<int> >::value,
- "");
+static_assert( std::is_constructible<std::shared_ptr<int[5]>, std::nullptr_t, test_deleter<int>, test_allocator<int> >::value, "");
static_assert(!std::is_constructible<std::shared_ptr<int[5]>, std::nullptr_t, bad_deleter, test_allocator<int> >::value, "");
static_assert(!std::is_constructible<std::shared_ptr<int[5]>, std::nullptr_t, no_nullptr_deleter, test_allocator<int> >::value, "");
static_assert(!std::is_constructible<std::shared_ptr<int[5]>, std::nullptr_t, no_move_deleter, test_allocator<int> >::value, "");
diff --git a/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter.pass.cpp b/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter.pass.cpp
index 95dcb92b51993..562acf56d96fe 100644
--- a/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter.pass.cpp
+++ b/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter.pass.cpp
@@ -115,14 +115,6 @@ int main(int, char**)
}
#endif // TEST_STD_VER >= 11
-#if TEST_STD_VER >= 14
- {
- // LWG 4110
- auto deleter = [](auto pointer) { delete pointer; };
- std::shared_ptr<int> p(new int, deleter);
- }
-#endif
-
test_function_type();
return 0;
}
diff --git a/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter_allocator.pass.cpp b/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter_allocator.pass.cpp
index 89e7d0b02d421..9dffbcdd59a73 100644
--- a/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter_allocator.pass.cpp
+++ b/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter_allocator.pass.cpp
@@ -165,13 +165,5 @@ int main(int, char**)
test_allocator<Derived[4]> >::value, "");
}
-#if TEST_STD_VER >= 14
- {
- // LWG 4110
- auto deleter = [](auto pointer) { delete pointer; };
- std::shared_ptr<int> p(new int, deleter, std::allocator<int>());
- }
-#endif
-
return 0;
}
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