* [committed] libstdc++: Add missing move in ranges::copy
@ 2022-11-03 11:41 Jonathan Wakely
0 siblings, 0 replies; only message in thread
From: Jonathan Wakely @ 2022-11-03 11:41 UTC (permalink / raw)
To: libstdc++, gcc-patches
Tested x86_64-linux. Pushed to trunk.
-- >8 --
This is needed to support a move-only output iterator when the input
iterators are specializations of __normal_iterator.
libstdc++-v3/ChangeLog:
* include/bits/ranges_algobase.h (__detail::__copy_or_move):
Move output iterator.
* testsuite/25_algorithms/copy/constrained.cc: Check copying to
move-only output iterator.
---
libstdc++-v3/include/bits/ranges_algobase.h | 2 +-
.../25_algorithms/copy/constrained.cc | 24 +++++++++++++++++++
2 files changed, 25 insertions(+), 1 deletion(-)
diff --git a/libstdc++-v3/include/bits/ranges_algobase.h b/libstdc++-v3/include/bits/ranges_algobase.h
index f6f0b9c83b0..443ad52ecc6 100644
--- a/libstdc++-v3/include/bits/ranges_algobase.h
+++ b/libstdc++-v3/include/bits/ranges_algobase.h
@@ -239,7 +239,7 @@ namespace ranges
{
auto [__in,__out]
= ranges::__copy_or_move<_IsMove>(__first.base(), __last.base(),
- __result);
+ std::move(__result));
return {decltype(__first){__in}, std::move(__out)};
}
else if constexpr (__is_normal_iterator<_Out>)
diff --git a/libstdc++-v3/testsuite/25_algorithms/copy/constrained.cc b/libstdc++-v3/testsuite/25_algorithms/copy/constrained.cc
index 98f038a6c5f..444dfa78894 100644
--- a/libstdc++-v3/testsuite/25_algorithms/copy/constrained.cc
+++ b/libstdc++-v3/testsuite/25_algorithms/copy/constrained.cc
@@ -226,6 +226,29 @@ test06()
VERIFY( ranges::equal(v, (int[]){1,2,3,0}) );
}
+void
+test07()
+{
+ struct move_only_output_iterator
+ {
+ using value_type = int;
+ using difference_type = short;
+ using iterator_category = std::output_iterator_tag;
+
+ move_only_output_iterator() = default;
+ move_only_output_iterator(move_only_output_iterator&&) = default;
+ move_only_output_iterator& operator=(move_only_output_iterator&&) = default;
+
+ move_only_output_iterator& operator*() { return *this; }
+ move_only_output_iterator& operator++() { return *this; }
+ move_only_output_iterator operator++(int) { return std::move(*this); }
+
+ void operator=(int) { }
+ };
+
+ ranges::copy(std::vector<int>{1,2,3}, move_only_output_iterator{});
+}
+
int
main()
{
@@ -235,4 +258,5 @@ main()
test04();
static_assert(test05());
test06();
+ test07();
}
--
2.38.1
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