From: Ken Matsui <kmatsui@gcc.gnu.org>
To: gcc-patches@gcc.gnu.org
Cc: libstdc++@gcc.gnu.org, Ken Matsui <kmatsui@gcc.gnu.org>
Subject: [PATCH v3 2/2] libstdc++: Use new built-in trait __is_pointer
Date: Wed, 12 Jul 2023 18:11:26 -0700 [thread overview]
Message-ID: <20230713011127.98367-2-kmatsui@gcc.gnu.org> (raw)
In-Reply-To: <20230713011127.98367-1-kmatsui@gcc.gnu.org>
This patch lets libstdc++ use new built-in trait __is_pointer.
libstdc++-v3/ChangeLog:
* include/bits/cpp_type_traits.h (__is_ptr): Use __is_pointer
built-in trait.
* include/std/type_traits (is_pointer): Likewise.
(is_pointer_v): Likewise. Optimize its implementation.
Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org>
---
libstdc++-v3/include/bits/cpp_type_traits.h | 8 +++++++
libstdc++-v3/include/std/type_traits | 25 +++++++++++++++++++--
2 files changed, 31 insertions(+), 2 deletions(-)
diff --git a/libstdc++-v3/include/bits/cpp_type_traits.h b/libstdc++-v3/include/bits/cpp_type_traits.h
index 3711e4be526..4da1e7c407c 100644
--- a/libstdc++-v3/include/bits/cpp_type_traits.h
+++ b/libstdc++-v3/include/bits/cpp_type_traits.h
@@ -363,6 +363,13 @@ __INT_N(__GLIBCXX_TYPE_INT_N_3)
//
// Pointer types
//
+#if __has_builtin(__is_pointer)
+ template<typename _Tp>
+ struct __is_ptr : __truth_type<__is_pointer(_Tp)>
+ {
+ enum { __value = __is_pointer(_Tp) };
+ };
+#else
template<typename _Tp>
struct __is_ptr
{
@@ -376,6 +383,7 @@ __INT_N(__GLIBCXX_TYPE_INT_N_3)
enum { __value = 1 };
typedef __true_type __type;
};
+#endif
//
// An arithmetic type is an integer type or a floating point type
diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits
index 0e7a9c9c7f3..181a50e48d0 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -515,6 +515,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
struct is_array<_Tp[]>
: public true_type { };
+ /// is_pointer
+#if __has_builtin(__is_pointer)
+ template<typename _Tp>
+ struct is_pointer
+ : public __bool_constant<__is_pointer(_Tp)>
+ { };
+#else
template<typename>
struct __is_pointer_helper
: public false_type { };
@@ -523,11 +530,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
struct __is_pointer_helper<_Tp*>
: public true_type { };
- /// is_pointer
template<typename _Tp>
struct is_pointer
: public __is_pointer_helper<__remove_cv_t<_Tp>>::type
{ };
+#endif
/// is_lvalue_reference
template<typename>
@@ -3168,8 +3175,22 @@ template <typename _Tp>
template <typename _Tp, size_t _Num>
inline constexpr bool is_array_v<_Tp[_Num]> = true;
+#if __has_builtin(__is_pointer)
template <typename _Tp>
- inline constexpr bool is_pointer_v = is_pointer<_Tp>::value;
+ inline constexpr bool is_pointer_v = __is_pointer(_Tp);
+#else
+template <typename _Tp>
+ inline constexpr bool is_pointer_v = false;
+template <typename _Tp>
+ inline constexpr bool is_pointer_v<_Tp*> = true;
+template <typename _Tp>
+ inline constexpr bool is_pointer_v<_Tp* const> = true;
+template <typename _Tp>
+ inline constexpr bool is_pointer_v<_Tp* volatile> = true;
+template <typename _Tp>
+ inline constexpr bool is_pointer_v<_Tp* const volatile> = true;
+#endif
+
template <typename _Tp>
inline constexpr bool is_lvalue_reference_v = false;
template <typename _Tp>
--
2.41.0
next prev parent reply other threads:[~2023-07-13 1:13 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-10 5:23 [PATCH 1/2] c++, libstdc++: implement __is_pointer built-in trait Ken Matsui
2023-07-10 5:23 ` [PATCH 2/2] libstdc++: use new built-in trait __is_pointer Ken Matsui
2023-07-10 5:32 ` Daniel Krügler
2023-07-10 5:34 ` Ken Matsui
2023-07-10 5:38 ` [PATCH v2 1/2] c++, libstdc++: implement __is_pointer built-in trait Ken Matsui
2023-07-10 5:38 ` [PATCH v2 2/2] libstdc++: use new built-in trait __is_pointer Ken Matsui
2023-07-10 5:50 ` [PATCH v2 1/2] c++, libstdc++: implement __is_pointer built-in trait Ken Matsui
2023-07-12 10:01 ` Jonathan Wakely
2023-07-12 20:42 ` Ken Matsui
2023-07-13 1:11 ` [PATCH v3 1/2] c++, libstdc++: Implement " Ken Matsui
2023-07-13 1:11 ` Ken Matsui [this message]
2023-07-13 1:13 ` Ken Matsui
2023-07-13 1:15 ` Ken Matsui
2023-07-13 3:16 ` [PATCH v4 " Ken Matsui
2023-07-13 3:16 ` [PATCH v4 2/2] libstdc++: Use new built-in trait __is_pointer Ken Matsui
2023-07-13 3:19 ` [PATCH v5 1/2] c++, libstdc++: Implement __is_pointer built-in trait Ken Matsui
2023-07-13 3:19 ` [PATCH v5 2/2] libstdc++: Use new built-in trait __is_pointer Ken Matsui
2023-07-13 20:48 ` [PATCH v6 1/2] c++, libstdc++: Implement __is_pointer built-in trait Ken Matsui
2023-07-13 20:48 ` [PATCH v6 2/2] libstdc++: Use new built-in trait __is_pointer Ken Matsui
2023-09-01 13:00 ` [PING][PATCH " Ken Matsui
2023-07-13 9:21 ` [PATCH v2 1/2] c++, libstdc++: implement __is_pointer built-in trait Jonathan Wakely
2023-07-13 20:04 ` Ken Matsui
2023-07-14 10:48 ` Jonathan Wakely
2023-07-14 10:49 ` Jonathan Wakely
2023-07-14 19:55 ` Ken Matsui
2023-07-12 4:40 ` [PATCH " François Dumont
2023-07-12 9:47 ` Jonathan Wakely
2023-07-12 9:48 ` Jonathan Wakely
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