[PATCH] libstdc++: Implement P2520R0 changes to move_iterator's iterator_concept
Patrick Palka
ppalka@redhat.com
Wed Mar 8 16:46:51 GMT 2023
Tested on x86_64-pc-linux-gnu, does this look OK for trunk and perhaps
backports?
libstdc++-v3/ChangeLog:
* include/bits/stl_iterator.h (move_iterator::_S_iter_concept):
Define.
(__cpp_lib_move_iterator_concept): Define for C++20.
(move_iterator::iterator_concept): Strengthen as per P2520R0.
* include/std/version (__cpp_lib_move_iterator_concept): Define
for C++20.
* testsuite/24_iterators/move_iterator/p2520r0.cc: New test.
---
libstdc++-v3/include/bits/stl_iterator.h | 20 +++++++++-
libstdc++-v3/include/std/version | 1 +
.../24_iterators/move_iterator/p2520r0.cc | 37 +++++++++++++++++++
3 files changed, 57 insertions(+), 1 deletion(-)
create mode 100644 libstdc++-v3/testsuite/24_iterators/move_iterator/p2520r0.cc
diff --git a/libstdc++-v3/include/bits/stl_iterator.h b/libstdc++-v3/include/bits/stl_iterator.h
index c20dc9ecac5..a6a09dbac16 100644
--- a/libstdc++-v3/include/bits/stl_iterator.h
+++ b/libstdc++-v3/include/bits/stl_iterator.h
@@ -1465,11 +1465,29 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
&& convertible_to<const _Iter2&, _Iterator>;
#endif
+#if __cplusplus > 201703L && __cpp_lib_concepts
+ static auto
+ _S_iter_concept()
+ {
+ if constexpr (random_access_iterator<_Iterator>)
+ return random_access_iterator_tag{};
+ else if constexpr (bidirectional_iterator<_Iterator>)
+ return bidirectional_iterator_tag{};
+ else if constexpr (forward_iterator<_Iterator>)
+ return forward_iterator_tag{};
+ else
+ return input_iterator_tag{};
+ }
+#endif
+
public:
using iterator_type = _Iterator;
#if __cplusplus > 201703L && __cpp_lib_concepts
- using iterator_concept = input_iterator_tag;
+ // This is P2520R0, a C++23 change, but we treat it as a DR against C++20.
+# define __cpp_lib_move_iterator_concept 202207L
+ using iterator_concept = decltype(_S_iter_concept());
+
// iterator_category defined in __move_iter_cat
using value_type = iter_value_t<_Iterator>;
using difference_type = iter_difference_t<_Iterator>;
diff --git a/libstdc++-v3/include/std/version b/libstdc++-v3/include/std/version
index 871d30db5b3..25ebfc3e512 100644
--- a/libstdc++-v3/include/std/version
+++ b/libstdc++-v3/include/std/version
@@ -289,6 +289,7 @@
#define __cpp_lib_polymorphic_allocator 201902L
#if __cpp_lib_concepts
# define __cpp_lib_ranges 202110L
+# define __cpp_lib_move_iterator_concept 202207L
#endif
#if __cpp_lib_atomic_wait || _GLIBCXX_HAVE_POSIX_SEMAPHORE
# define __cpp_lib_semaphore 201907L
diff --git a/libstdc++-v3/testsuite/24_iterators/move_iterator/p2520r0.cc b/libstdc++-v3/testsuite/24_iterators/move_iterator/p2520r0.cc
new file mode 100644
index 00000000000..883d6cc09e0
--- /dev/null
+++ b/libstdc++-v3/testsuite/24_iterators/move_iterator/p2520r0.cc
@@ -0,0 +1,37 @@
+// { dg-options "-std=gnu++20" }
+// { dg-do compile { target c++20 } }
+
+// Verify P2520R0 changes to move_iterator's iterator_concept, which we treat
+// as a DR against C++20.
+
+#include <iterator>
+#if __cpp_lib_move_iterator_concept != 202207L
+# error "Feature-test macro __cpp_lib_move_iterator_concept has wrong value in <iterator>"
+#endif
+
+#undef __cpp_lib_move_iterator_concept
+#include <version>
+#if __cpp_lib_move_iterator_concept != 202207L
+# error "Feature-test macro __cpp_lib_move_iterator_concept has wrong value in <version>"
+#endif
+
+#include <testsuite_iterators.h>
+
+using __gnu_test::test_input_range;
+using __gnu_test::test_forward_range;
+using __gnu_test::test_bidirectional_range;
+using __gnu_test::test_random_access_range;
+
+using ty1 = std::move_iterator<decltype(std::declval<test_input_range<int>&>().begin())>;
+static_assert(std::same_as<ty1::iterator_concept, std::input_iterator_tag>);
+
+using ty2 = std::move_iterator<decltype(std::declval<test_forward_range<int>&>().begin())>;
+static_assert(std::same_as<ty2::iterator_concept, std::forward_iterator_tag>);
+
+using ty3 = std::move_iterator<decltype(std::declval<test_bidirectional_range<int>&>().begin())>;
+static_assert(std::same_as<ty3::iterator_concept, std::bidirectional_iterator_tag>);
+
+using ty4 = std::move_iterator<decltype(std::declval<test_random_access_range<int>&>().begin())>;
+static_assert(std::same_as<ty4::iterator_concept, std::random_access_iterator_tag>);
+
+static_assert(std::random_access_iterator<std::move_iterator<int*>>);
--
2.40.0.rc0.57.g454dfcbddf
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