[libcxx-commits] [libcxx] dd48913 - [libc++] Fix _CopySegment helper in ranges::copy(join_view, out) when called in a static assertion context (#69593)
via libcxx-commits
libcxx-commits at lists.llvm.org
Fri Oct 27 02:07:16 PDT 2023
Author: Rajveer Singh Bharadwaj
Date: 2023-10-27T11:07:12+02:00
New Revision: dd4891318c72d3d0503801a2f78da77fa00c6dcf
URL: https://github.com/llvm/llvm-project/commit/dd4891318c72d3d0503801a2f78da77fa00c6dcf
DIFF: https://github.com/llvm/llvm-project/commit/dd4891318c72d3d0503801a2f78da77fa00c6dcf.diff
LOG: [libc++] Fix _CopySegment helper in ranges::copy(join_view, out) when called in a static assertion context (#69593)
Resolves Issue #69083
The `_CopySegment` helper for `ranges::copy(join_view, out)` is not
`constexpr` causing rejection in `libc++` in a static assertion context
as in the issue snippet.
Added:
libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy_backward.segmented.pass.cpp
libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy_n.segmented.pass.cpp
libcxx/test/std/algorithms/alg.modifying.operations/alg.move/ranges.move.segmented.pass.cpp
libcxx/test/std/algorithms/alg.modifying.operations/alg.move/ranges.move_backward.segmented.pass.cpp
Modified:
libcxx/include/__algorithm/copy.h
libcxx/include/__algorithm/move.h
libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy.segmented.pass.cpp
Removed:
################################################################################
diff --git a/libcxx/include/__algorithm/copy.h b/libcxx/include/__algorithm/copy.h
index dfe9898c6480cf8..b35c6fa04a38149 100644
--- a/libcxx/include/__algorithm/copy.h
+++ b/libcxx/include/__algorithm/copy.h
@@ -51,9 +51,10 @@ struct __copy_loop {
_OutIter& __result_;
- _LIBCPP_HIDE_FROM_ABI _CopySegment(_OutIter& __result) : __result_(__result) {}
+ _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit _CopySegment(_OutIter& __result)
+ : __result_(__result) {}
- _LIBCPP_HIDE_FROM_ABI void
+ _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void
operator()(typename _Traits::__local_iterator __lfirst, typename _Traits::__local_iterator __llast) {
__result_ = std::__copy<_AlgPolicy>(__lfirst, __llast, std::move(__result_)).second;
}
diff --git a/libcxx/include/__algorithm/move.h b/libcxx/include/__algorithm/move.h
index 01aeef4e177e814..e0da07117e66c9f 100644
--- a/libcxx/include/__algorithm/move.h
+++ b/libcxx/include/__algorithm/move.h
@@ -52,9 +52,10 @@ struct __move_loop {
_OutIter& __result_;
- _LIBCPP_HIDE_FROM_ABI _MoveSegment(_OutIter& __result) : __result_(__result) {}
+ _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit _MoveSegment(_OutIter& __result)
+ : __result_(__result) {}
- _LIBCPP_HIDE_FROM_ABI void
+ _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void
operator()(typename _Traits::__local_iterator __lfirst, typename _Traits::__local_iterator __llast) {
__result_ = std::__move<_AlgPolicy>(__lfirst, __llast, std::move(__result_)).second;
}
diff --git a/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy.segmented.pass.cpp b/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy.segmented.pass.cpp
index abb9157df9abbbb..50fb479afcd0640 100644
--- a/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy.segmented.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy.segmented.pass.cpp
@@ -92,10 +92,7 @@ constexpr void test_join_view() {
}
}
-int main(int, char**) {
- test_containers<std::deque<int>, std::deque<int>>();
- test_containers<std::deque<int>, std::vector<int>>();
- test_containers<std::vector<int>, std::deque<int>>();
+constexpr bool test_constexpr() {
test_containers<std::vector<int>, std::vector<int>>();
types::for_each(types::forward_iterator_list<int*>{}, []<class Iter> {
@@ -103,6 +100,16 @@ int main(int, char**) {
test_join_view<Iter, sentinel_wrapper<Iter>>();
test_join_view<Iter, sized_sentinel<Iter>>();
});
+ return true;
+}
+
+int main(int, char**) {
+ test_containers<std::deque<int>, std::deque<int>>();
+ test_containers<std::deque<int>, std::vector<int>>();
+ test_containers<std::vector<int>, std::deque<int>>();
+
+ test_constexpr();
+ static_assert(test_constexpr());
return 0;
}
diff --git a/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy_backward.segmented.pass.cpp b/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy_backward.segmented.pass.cpp
new file mode 100644
index 000000000000000..c434cea1208cfe8
--- /dev/null
+++ b/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy_backward.segmented.pass.cpp
@@ -0,0 +1,111 @@
+//===----------------------------------------------------------------------===//
+//
+// 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++03, c++11, c++14, c++17
+// TODO: make `join_view` non-experimental once D2770 is implemented.
+// UNSUPPORTED: !c++experimental
+
+#include <algorithm>
+#include <array>
+#include <cassert>
+#include <concepts>
+#include <deque>
+#include <ranges>
+#include <vector>
+
+#include "test_iterators.h"
+#include "type_algorithms.h"
+
+template <class InContainer, class OutContainer>
+constexpr void test_containers() {
+ using InIter = typename InContainer::iterator;
+ using OutIter = typename OutContainer::iterator;
+
+ {
+ InContainer in{1, 2, 3, 4};
+ OutContainer out(4);
+
+ std::same_as<std::ranges::in_out_result<InIter, OutIter>> auto ret =
+ std::ranges::copy_backward(in.begin(), in.end(), out.end());
+ assert(std::ranges::equal(in, out));
+ assert(ret.in == in.end());
+ assert(ret.out == out.begin());
+ }
+ {
+ InContainer in{1, 2, 3, 4};
+ OutContainer out(4);
+ std::same_as<std::ranges::in_out_result<InIter, OutIter>> auto ret = std::ranges::copy_backward(in, out.end());
+ assert(std::ranges::equal(in, out));
+ assert(ret.in == in.end());
+ assert(ret.out == out.begin());
+ }
+}
+
+template <class Iter, class Sent>
+constexpr void test_join_view() {
+ auto to_subranges = std::views::transform([](auto& vec) {
+ return std::ranges::subrange(Iter(vec.data()), Sent(Iter(vec.data() + vec.size())));
+ });
+
+ { // segmented -> contiguous
+ std::vector<std::vector<int>> vectors = {};
+ auto range = vectors | to_subranges;
+ std::vector<std::ranges::subrange<Iter, Sent>> subrange_vector(range.begin(), range.end());
+ std::array<int, 0> arr;
+
+ std::ranges::copy_backward(subrange_vector | std::views::join, arr.end());
+ assert(std::ranges::equal(arr, std::array<int, 0>{}));
+ }
+ { // segmented -> contiguous
+ std::vector<std::vector<int>> vectors = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10}, {}};
+ auto range = vectors | to_subranges;
+ std::vector<std::ranges::subrange<Iter, Sent>> subrange_vector(range.begin(), range.end());
+ std::array<int, 10> arr;
+
+ std::ranges::copy_backward(subrange_vector | std::views::join, arr.end());
+ assert(std::ranges::equal(arr, std::array{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}));
+ }
+ { // contiguous -> segmented
+ std::vector<std::vector<int>> vectors = {{0, 0, 0, 0}, {0, 0}, {0, 0, 0, 0}, {}};
+ auto range = vectors | to_subranges;
+ std::vector<std::ranges::subrange<Iter, Sent>> subrange_vector(range.begin(), range.end());
+ std::array arr = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
+
+ std::ranges::copy_backward(arr, (subrange_vector | std::views::join).end());
+ assert(std::ranges::equal(subrange_vector | std::views::join, std::array{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}));
+ }
+ { // segmented -> segmented
+ std::vector<std::vector<int>> vectors = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10}, {}};
+ auto range1 = vectors | to_subranges;
+ std::vector<std::ranges::subrange<Iter, Sent>> subrange_vector(range1.begin(), range1.end());
+ std::vector<std::vector<int>> to_vectors = {{0, 0, 0, 0}, {0, 0, 0, 0}, {}, {0, 0}};
+ auto range2 = to_vectors | to_subranges;
+ std::vector<std::ranges::subrange<Iter, Sent>> to_subrange_vector(range2.begin(), range2.end());
+
+ std::ranges::copy_backward(subrange_vector | std::views::join, (to_subrange_vector | std::views::join).end());
+ assert(std::ranges::equal(to_subrange_vector | std::views::join, std::array{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}));
+ }
+}
+
+constexpr bool test_constexpr() {
+ test_containers<std::vector<int>, std::vector<int>>();
+
+ types::for_each(types::bidirectional_iterator_list<int*>{}, []<class Iter> { test_join_view<Iter, Iter>(); });
+ return true;
+}
+
+int main(int, char**) {
+ test_containers<std::deque<int>, std::deque<int>>();
+ test_containers<std::deque<int>, std::vector<int>>();
+ test_containers<std::vector<int>, std::deque<int>>();
+
+ test_constexpr();
+ static_assert(test_constexpr());
+
+ return 0;
+}
diff --git a/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy_n.segmented.pass.cpp b/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy_n.segmented.pass.cpp
new file mode 100644
index 000000000000000..eae40cefa663f82
--- /dev/null
+++ b/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy_n.segmented.pass.cpp
@@ -0,0 +1,114 @@
+//===----------------------------------------------------------------------===//
+//
+// 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++03, c++11, c++14, c++17
+// TODO: make `join_view` non-experimental once D2770 is implemented.
+// UNSUPPORTED: !c++experimental
+
+#include <algorithm>
+#include <array>
+#include <cassert>
+#include <concepts>
+#include <deque>
+#include <ranges>
+#include <vector>
+
+#include "test_iterators.h"
+#include "type_algorithms.h"
+
+template <class InContainer, class OutContainer>
+constexpr void test_containers() {
+ using InIter = typename InContainer::iterator;
+ using OutIter = typename OutContainer::iterator;
+
+ {
+ InContainer in{1, 2, 3, 4};
+ OutContainer out(4);
+
+ std::same_as<std::ranges::in_out_result<InIter, OutIter>> auto ret =
+ std::ranges::copy_n(in.begin(), in.size(), out.begin());
+ assert(std::ranges::equal(in, out));
+ assert(ret.in == in.end());
+ assert(ret.out == out.end());
+ }
+}
+
+template <class Iter, class Sent>
+constexpr void test_join_view() {
+ auto to_subranges = std::views::transform([](auto& vec) {
+ return std::ranges::subrange(Iter(vec.data()), Sent(Iter(vec.data() + vec.size())));
+ });
+
+ { // segmented -> contiguous
+ std::vector<std::vector<int>> vectors = {};
+ auto range = vectors | to_subranges;
+ std::vector<std::ranges::subrange<Iter, Sent>> subrange_vector(range.begin(), range.end());
+ std::array<int, 0> arr;
+
+ std::ranges::copy_n((subrange_vector | std::views::join).begin(),
+ std::ranges::distance(subrange_vector | std::views::join),
+ arr.begin());
+ assert(std::ranges::equal(arr, std::array<int, 0>{}));
+ }
+ { // segmented -> contiguous
+ std::vector<std::vector<int>> vectors = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10}, {}};
+ auto range = vectors | to_subranges;
+ std::vector<std::ranges::subrange<Iter, Sent>> subrange_vector(range.begin(), range.end());
+ std::array<int, 10> arr;
+
+ std::ranges::copy_n((subrange_vector | std::views::join).begin(),
+ std::ranges::distance(subrange_vector | std::views::join),
+ arr.begin());
+ assert(std::ranges::equal(arr, std::array{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}));
+ }
+ { // contiguous -> segmented
+ std::vector<std::vector<int>> vectors = {{0, 0, 0, 0}, {0, 0}, {0, 0, 0, 0}, {}};
+ auto range = vectors | to_subranges;
+ std::vector<std::ranges::subrange<Iter, Sent>> subrange_vector(range.begin(), range.end());
+ std::array arr = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
+
+ std::ranges::copy_n(arr.begin(), arr.size(), (subrange_vector | std::views::join).begin());
+ assert(std::ranges::equal(subrange_vector | std::views::join, std::array{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}));
+ }
+ { // segmented -> segmented
+ std::vector<std::vector<int>> vectors = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10}, {}};
+ auto range1 = vectors | to_subranges;
+ std::vector<std::ranges::subrange<Iter, Sent>> subrange_vector(range1.begin(), range1.end());
+ std::vector<std::vector<int>> to_vectors = {{0, 0, 0, 0}, {0, 0, 0, 0}, {}, {0, 0}};
+ auto range2 = to_vectors | to_subranges;
+ std::vector<std::ranges::subrange<Iter, Sent>> to_subrange_vector(range2.begin(), range2.end());
+
+ std::ranges::copy_n((subrange_vector | std::views::join).begin(),
+ std::ranges::distance(subrange_vector | std::views::join),
+ (to_subrange_vector | std::views::join).begin());
+ assert(std::ranges::equal(to_subrange_vector | std::views::join, std::array{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}));
+ }
+}
+
+constexpr bool test_constexpr() {
+ test_containers<std::vector<int>, std::vector<int>>();
+
+ // TODO: this should be cpp20_input_iterator_list, not forward_iterator_list
+ types::for_each(types::forward_iterator_list<int*>{}, []<class Iter> {
+ test_join_view<Iter, Iter>();
+ test_join_view<Iter, sentinel_wrapper<Iter>>();
+ test_join_view<Iter, sized_sentinel<Iter>>();
+ });
+ return true;
+}
+
+int main(int, char**) {
+ test_containers<std::deque<int>, std::deque<int>>();
+ test_containers<std::deque<int>, std::vector<int>>();
+ test_containers<std::vector<int>, std::deque<int>>();
+
+ test_constexpr();
+ static_assert(test_constexpr());
+
+ return 0;
+}
diff --git a/libcxx/test/std/algorithms/alg.modifying.operations/alg.move/ranges.move.segmented.pass.cpp b/libcxx/test/std/algorithms/alg.modifying.operations/alg.move/ranges.move.segmented.pass.cpp
new file mode 100644
index 000000000000000..2df6a10b18504ce
--- /dev/null
+++ b/libcxx/test/std/algorithms/alg.modifying.operations/alg.move/ranges.move.segmented.pass.cpp
@@ -0,0 +1,115 @@
+//===----------------------------------------------------------------------===//
+//
+// 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++03, c++11, c++14, c++17
+// TODO: make `join_view` non-experimental once D2770 is implemented.
+// UNSUPPORTED: !c++experimental
+
+#include <algorithm>
+#include <array>
+#include <cassert>
+#include <concepts>
+#include <deque>
+#include <ranges>
+#include <vector>
+
+#include "test_iterators.h"
+#include "type_algorithms.h"
+
+template <class InContainer, class OutContainer>
+constexpr void test_containers() {
+ using InIter = typename InContainer::iterator;
+ using OutIter = typename OutContainer::iterator;
+
+ {
+ InContainer in{1, 2, 3, 4};
+ OutContainer out(4);
+
+ std::same_as<std::ranges::in_out_result<InIter, OutIter>> auto ret =
+ std::ranges::move(in.begin(), in.end(), out.begin());
+ assert(std::ranges::equal(in, out));
+ assert(ret.in == in.end());
+ assert(ret.out == out.end());
+ }
+ {
+ InContainer in{1, 2, 3, 4};
+ OutContainer out(4);
+ std::same_as<std::ranges::in_out_result<InIter, OutIter>> auto ret = std::ranges::move(in, out.begin());
+ assert(std::ranges::equal(in, out));
+ assert(ret.in == in.end());
+ assert(ret.out == out.end());
+ }
+}
+
+template <class Iter, class Sent>
+constexpr void test_join_view() {
+ auto to_subranges = std::views::transform([](auto& vec) {
+ return std::ranges::subrange(Iter(vec.data()), Sent(Iter(vec.data() + vec.size())));
+ });
+
+ { // segmented -> contiguous
+ std::vector<std::vector<int>> vectors = {};
+ auto range = vectors | to_subranges;
+ std::vector<std::ranges::subrange<Iter, Sent>> subrange_vector(range.begin(), range.end());
+ std::array<int, 0> arr;
+
+ std::ranges::move(subrange_vector | std::views::join, arr.begin());
+ assert(std::ranges::equal(arr, std::array<int, 0>{}));
+ }
+ { // segmented -> contiguous
+ std::vector<std::vector<int>> vectors = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10}, {}};
+ auto range = vectors | to_subranges;
+ std::vector<std::ranges::subrange<Iter, Sent>> subrange_vector(range.begin(), range.end());
+ std::array<int, 10> arr;
+
+ std::ranges::move(subrange_vector | std::views::join, arr.begin());
+ assert(std::ranges::equal(arr, std::array{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}));
+ }
+ { // contiguous -> segmented
+ std::vector<std::vector<int>> vectors = {{0, 0, 0, 0}, {0, 0}, {0, 0, 0, 0}, {}};
+ auto range = vectors | to_subranges;
+ std::vector<std::ranges::subrange<Iter, Sent>> subrange_vector(range.begin(), range.end());
+ std::array arr = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
+
+ std::ranges::move(arr, (subrange_vector | std::views::join).begin());
+ assert(std::ranges::equal(subrange_vector | std::views::join, std::array{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}));
+ }
+ { // segmented -> segmented
+ std::vector<std::vector<int>> vectors = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10}, {}};
+ auto range1 = vectors | to_subranges;
+ std::vector<std::ranges::subrange<Iter, Sent>> subrange_vector(range1.begin(), range1.end());
+ std::vector<std::vector<int>> to_vectors = {{0, 0, 0, 0}, {0, 0, 0, 0}, {}, {0, 0}};
+ auto range2 = to_vectors | to_subranges;
+ std::vector<std::ranges::subrange<Iter, Sent>> to_subrange_vector(range2.begin(), range2.end());
+
+ std::ranges::move(subrange_vector | std::views::join, (to_subrange_vector | std::views::join).begin());
+ assert(std::ranges::equal(to_subrange_vector | std::views::join, std::array{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}));
+ }
+}
+
+constexpr bool test_constexpr() {
+ test_containers<std::vector<int>, std::vector<int>>();
+
+ types::for_each(types::forward_iterator_list<int*>{}, []<class Iter> {
+ test_join_view<Iter, Iter>();
+ test_join_view<Iter, sentinel_wrapper<Iter>>();
+ test_join_view<Iter, sized_sentinel<Iter>>();
+ });
+ return true;
+}
+
+int main(int, char**) {
+ test_containers<std::deque<int>, std::deque<int>>();
+ test_containers<std::deque<int>, std::vector<int>>();
+ test_containers<std::vector<int>, std::deque<int>>();
+
+ test_constexpr();
+ static_assert(test_constexpr());
+
+ return 0;
+}
diff --git a/libcxx/test/std/algorithms/alg.modifying.operations/alg.move/ranges.move_backward.segmented.pass.cpp b/libcxx/test/std/algorithms/alg.modifying.operations/alg.move/ranges.move_backward.segmented.pass.cpp
new file mode 100644
index 000000000000000..0f0a71439a10dd1
--- /dev/null
+++ b/libcxx/test/std/algorithms/alg.modifying.operations/alg.move/ranges.move_backward.segmented.pass.cpp
@@ -0,0 +1,111 @@
+//===----------------------------------------------------------------------===//
+//
+// 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++03, c++11, c++14, c++17
+// TODO: make `join_view` non-experimental once D2770 is implemented.
+// UNSUPPORTED: !c++experimental
+
+#include <algorithm>
+#include <array>
+#include <cassert>
+#include <concepts>
+#include <deque>
+#include <ranges>
+#include <vector>
+
+#include "test_iterators.h"
+#include "type_algorithms.h"
+
+template <class InContainer, class OutContainer>
+constexpr void test_containers() {
+ using InIter = typename InContainer::iterator;
+ using OutIter = typename OutContainer::iterator;
+
+ {
+ InContainer in{1, 2, 3, 4};
+ OutContainer out(4);
+
+ std::same_as<std::ranges::in_out_result<InIter, OutIter>> auto ret =
+ std::ranges::move_backward(in.begin(), in.end(), out.end());
+ assert(std::ranges::equal(in, out));
+ assert(ret.in == in.end());
+ assert(ret.out == out.begin());
+ }
+ {
+ InContainer in{1, 2, 3, 4};
+ OutContainer out(4);
+ std::same_as<std::ranges::in_out_result<InIter, OutIter>> auto ret = std::ranges::move_backward(in, out.end());
+ assert(std::ranges::equal(in, out));
+ assert(ret.in == in.end());
+ assert(ret.out == out.begin());
+ }
+}
+
+template <class Iter, class Sent>
+constexpr void test_join_view() {
+ auto to_subranges = std::views::transform([](auto& vec) {
+ return std::ranges::subrange(Iter(vec.data()), Sent(Iter(vec.data() + vec.size())));
+ });
+
+ { // segmented -> contiguous
+ std::vector<std::vector<int>> vectors = {};
+ auto range = vectors | to_subranges;
+ std::vector<std::ranges::subrange<Iter, Sent>> subrange_vector(range.begin(), range.end());
+ std::array<int, 0> arr;
+
+ std::ranges::move_backward(subrange_vector | std::views::join, arr.end());
+ assert(std::ranges::equal(arr, std::array<int, 0>{}));
+ }
+ { // segmented -> contiguous
+ std::vector<std::vector<int>> vectors = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10}, {}};
+ auto range = vectors | to_subranges;
+ std::vector<std::ranges::subrange<Iter, Sent>> subrange_vector(range.begin(), range.end());
+ std::array<int, 10> arr;
+
+ std::ranges::move_backward(subrange_vector | std::views::join, arr.end());
+ assert(std::ranges::equal(arr, std::array{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}));
+ }
+ { // contiguous -> segmented
+ std::vector<std::vector<int>> vectors = {{0, 0, 0, 0}, {0, 0}, {0, 0, 0, 0}, {}};
+ auto range = vectors | to_subranges;
+ std::vector<std::ranges::subrange<Iter, Sent>> subrange_vector(range.begin(), range.end());
+ std::array arr = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
+
+ std::ranges::move_backward(arr, (subrange_vector | std::views::join).end());
+ assert(std::ranges::equal(subrange_vector | std::views::join, std::array{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}));
+ }
+ { // segmented -> segmented
+ std::vector<std::vector<int>> vectors = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10}, {}};
+ auto range1 = vectors | to_subranges;
+ std::vector<std::ranges::subrange<Iter, Sent>> subrange_vector(range1.begin(), range1.end());
+ std::vector<std::vector<int>> to_vectors = {{0, 0, 0, 0}, {0, 0, 0, 0}, {}, {0, 0}};
+ auto range2 = to_vectors | to_subranges;
+ std::vector<std::ranges::subrange<Iter, Sent>> to_subrange_vector(range2.begin(), range2.end());
+
+ std::ranges::move_backward(subrange_vector | std::views::join, (to_subrange_vector | std::views::join).end());
+ assert(std::ranges::equal(to_subrange_vector | std::views::join, std::array{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}));
+ }
+}
+
+constexpr bool test_constexpr() {
+ test_containers<std::vector<int>, std::vector<int>>();
+
+ types::for_each(types::bidirectional_iterator_list<int*>{}, []<class Iter> { test_join_view<Iter, Iter>(); });
+ return true;
+}
+
+int main(int, char**) {
+ test_containers<std::deque<int>, std::deque<int>>();
+ test_containers<std::deque<int>, std::vector<int>>();
+ test_containers<std::vector<int>, std::deque<int>>();
+
+ test_constexpr();
+ static_assert(test_constexpr());
+
+ return 0;
+}
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