[libcxx-commits] [libcxx] r357586 - [libc++] (Take 2) Correctly handle Objective-C++ ARC qualifiers in std::is_pointer

[Louis Dionne via libcxx-commits]

Author: ldionne
Date: Wed Apr  3 07:29:52 2019
New Revision: 357586

URL: http://llvm.org/viewvc/llvm-project?rev=357586&view=rev
Log:
[libc++] (Take 2) Correctly handle Objective-C++ ARC qualifiers in std::is_pointer

Summary:
Otherwise, std::is_pointer<id __strong> works, but std::is_pointer<id __weak>
(and others) don't work as expected.

The previous patch (r357517) had to be reverted in r357569 because it
broke the Chromium build. This patch shouldn't have the same problem.

rdar://problem/49126333

Reviewers: ahatanak, EricWF

Subscribers: christof, jkorous, dexonsmith, libcxx-commits

Differential Revision: https://reviews.llvm.org/D60087

Added:
    libcxx/trunk/test/libcxx/type_traits/is_pointer.arc.pass.mm
Modified:
    libcxx/trunk/include/type_traits

Modified: libcxx/trunk/include/type_traits
URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/type_traits?rev=357586&r1=357585&r2=357586&view=diff
==============================================================================
--- libcxx/trunk/include/type_traits (original)
+++ libcxx/trunk/include/type_traits Wed Apr  3 07:29:52 2019
@@ -785,8 +785,16 @@ _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR boo
 template <class _Tp> struct __libcpp_is_pointer       : public false_type {};
 template <class _Tp> struct __libcpp_is_pointer<_Tp*> : public true_type {};
 
+template <class _Tp> struct __libcpp_remove_objc_qualifiers { typedef _Tp type; };
+#if defined(_LIBCPP_HAS_OBJC_ARC)
+template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __strong> { typedef _Tp type; };
+template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __weak> { typedef _Tp type; };
+template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __autoreleasing> { typedef _Tp type; };
+template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __unsafe_unretained> { typedef _Tp type; };
+#endif
+
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_pointer
-    : public __libcpp_is_pointer<typename remove_cv<_Tp>::type> {};
+    : public __libcpp_is_pointer<typename __libcpp_remove_objc_qualifiers<typename remove_cv<_Tp>::type>::type> {};
 
 #if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
 template <class _Tp>

Added: libcxx/trunk/test/libcxx/type_traits/is_pointer.arc.pass.mm
URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/libcxx/type_traits/is_pointer.arc.pass.mm?rev=357586&view=auto
==============================================================================
--- libcxx/trunk/test/libcxx/type_traits/is_pointer.arc.pass.mm (added)
+++ libcxx/trunk/test/libcxx/type_traits/is_pointer.arc.pass.mm Wed Apr  3 07:29:52 2019
@@ -0,0 +1,64 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// UNSUPPORTED: c++98, c++03
+
+// <type_traits>
+
+// std::is_pointer
+
+// Test that we correctly handle Objective-C++ ARC qualifiers on pointers.
+
+#include <type_traits>
+
+
+template <typename T>
+void test_is_pointer() {
+    static_assert(std::is_pointer<T>::value, "");
+
+    static_assert(std::is_pointer<T __weak>::value, "");
+    static_assert(std::is_pointer<T __strong>::value, "");
+    static_assert(std::is_pointer<T __autoreleasing>::value, "");
+    static_assert(std::is_pointer<T __unsafe_unretained>::value, "");
+
+    static_assert(std::is_pointer<T __weak const>::value, "");
+    static_assert(std::is_pointer<T __strong const>::value, "");
+    static_assert(std::is_pointer<T __autoreleasing const>::value, "");
+    static_assert(std::is_pointer<T __unsafe_unretained const>::value, "");
+
+    static_assert(std::is_pointer<T __weak volatile>::value, "");
+    static_assert(std::is_pointer<T __strong volatile>::value, "");
+    static_assert(std::is_pointer<T __autoreleasing volatile>::value, "");
+    static_assert(std::is_pointer<T __unsafe_unretained volatile>::value, "");
+
+    static_assert(std::is_pointer<T __weak const volatile>::value, "");
+    static_assert(std::is_pointer<T __strong const volatile>::value, "");
+    static_assert(std::is_pointer<T __autoreleasing const volatile>::value, "");
+    static_assert(std::is_pointer<T __unsafe_unretained const volatile>::value, "");
+}
+
+ at class Foo;
+
+int main(int, char**) {
+    test_is_pointer<id>();
+    test_is_pointer<id const>();
+    test_is_pointer<id volatile>();
+    test_is_pointer<id const volatile>();
+
+    test_is_pointer<Foo*>();
+    test_is_pointer<Foo const*>();
+    test_is_pointer<Foo volatile*>();
+    test_is_pointer<Foo const volatile*>();
+
+    test_is_pointer<void*>();
+    test_is_pointer<void const*>();
+    test_is_pointer<void volatile*>();
+    test_is_pointer<void const volatile*>();
+
+    return 0;
+}