[libcxx-commits] [libcxx] [lldb] [libc] [compiler-rt] [llvm] [flang] [clang-tools-extra] [clang] [mlir] [libc++][ranges] Implement ranges::contains_subrange (PR #66963)
via libcxx-commits
libcxx-commits at lists.llvm.org
Wed Jan 3 19:01:55 PST 2024
https://github.com/ZijunZhaoCCK updated https://github.com/llvm/llvm-project/pull/66963
>From 647f5fe641b30c874bab770fced9fcec9b601161 Mon Sep 17 00:00:00 2001
From: Zijun Zhao <zijunzhao at google.com>
Date: Wed, 13 Sep 2023 14:26:01 -0700
Subject: [PATCH 1/7] [libc++] Implement ranges::contains_subrange
---
libcxx/include/CMakeLists.txt | 1 +
.../__algorithm/ranges_contains_subrange.h | 145 +++++++++
libcxx/include/algorithm | 14 +
...obust_against_copying_projections.pass.cpp | 2 +
.../ranges.contains_subrange.pass.cpp | 293 ++++++++++++++++++
.../niebloid.compile.pass.cpp | 1 +
6 files changed, 456 insertions(+)
create mode 100644 libcxx/include/__algorithm/ranges_contains_subrange.h
create mode 100644 libcxx/test/std/algorithms/alg.nonmodifying/alg.contains/ranges.contains_subrange.pass.cpp
diff --git a/libcxx/include/CMakeLists.txt b/libcxx/include/CMakeLists.txt
index 0fe3ab44d2466e..dd3ff541fbc7ba 100644
--- a/libcxx/include/CMakeLists.txt
+++ b/libcxx/include/CMakeLists.txt
@@ -110,6 +110,7 @@ set(files
__algorithm/ranges_binary_search.h
__algorithm/ranges_clamp.h
__algorithm/ranges_contains.h
+ __algorithm/ranges_contains_subrange.h
__algorithm/ranges_copy.h
__algorithm/ranges_copy_backward.h
__algorithm/ranges_copy_if.h
diff --git a/libcxx/include/__algorithm/ranges_contains_subrange.h b/libcxx/include/__algorithm/ranges_contains_subrange.h
new file mode 100644
index 00000000000000..16de6c29cb2a1a
--- /dev/null
+++ b/libcxx/include/__algorithm/ranges_contains_subrange.h
@@ -0,0 +1,145 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___ALGORITHM_RANGES_CONTAINS_SUBRANGE_H
+#define _LIBCPP___ALGORITHM_RANGES_CONTAINS_SUBRANGE_H
+
+#include <__algorithm/ranges_starts_with.h>
+#include <__config>
+#include <__functional/identity.h>
+#include <__functional/ranges_operations.h>
+#include <__functional/reference_wrapper.h>
+#include <__iterator/concepts.h>
+#include <__iterator/distance.h>
+#include <__iterator/indirectly_comparable.h>
+#include <__iterator/projected.h>
+#include <__ranges/access.h>
+#include <__ranges/concepts.h>
+#include <__utility/move.h>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+# pragma GCC system_header
+#endif
+
+#if _LIBCPP_STD_VER >= 23
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+namespace ranges {
+namespace __contains_subrange {
+struct __fn {
+ template <input_iterator _Iter1,
+ sentinel_for<_Iter1> _Sent1,
+ input_iterator _Iter2,
+ sentinel_for<_Iter2> _Sent2,
+ class _Pred,
+ class _Proj1,
+ class _Proj2,
+ class _Offset>
+ static _LIBCPP_HIDE_FROM_ABI constexpr bool __contains_subrange_fn_impl(
+ _Iter1 __first1,
+ _Sent1 __last1,
+ _Iter2 __first2,
+ _Sent2 __last2,
+ _Pred& __pred,
+ _Proj1& __proj1,
+ _Proj2& __proj2,
+ _Offset __offset) {
+ if (__offset < 0)
+ return false;
+ else {
+ for (; __offset >= 0; __offset--, __first1++) {
+ auto result = ranges::starts_with(
+ std::move(__first1),
+ std::move(__last1),
+ std::move(__first2),
+ std::move(__last2),
+ std::ref(__pred),
+ std::ref(__proj1),
+ std::ref(__proj2));
+ if (result)
+ return true;
+ }
+ return false;
+ }
+ }
+
+ template <input_iterator _Iter1,
+ sentinel_for<_Iter1> _Sent1,
+ input_iterator _Iter2,
+ sentinel_for<_Iter2> _Sent2,
+ class _Pred = ranges::equal_to,
+ class _Proj1 = identity,
+ class _Proj2 = identity>
+ requires indirectly_comparable<_Iter1, _Iter2, _Pred, _Proj1, _Proj2>
+ _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(
+ _Iter1 __first1,
+ _Sent1 __last1,
+ _Iter2 __first2,
+ _Sent2 __last2,
+ _Pred __pred = {},
+ _Proj1 __proj1 = {},
+ _Proj2 __proj2 = {}) const {
+ auto __n1 = ranges::distance(__first1, __last1);
+ auto __n2 = ranges::distance(__first2, __last2);
+ auto __offset = __n1 - __n2;
+
+ return __contains_subrange_fn_impl(
+ std::move(__first1),
+ std::move(__last1),
+ std::move(__first2),
+ std::move(__last2),
+ __pred,
+ __proj1,
+ __proj2,
+ std::move(__offset));
+ }
+
+ template <input_range _Range1,
+ input_range _Range2,
+ class _Pred = ranges::equal_to,
+ class _Proj1 = identity,
+ class _Proj2 = identity>
+ requires indirectly_comparable<iterator_t<_Range1>, iterator_t<_Range2>, _Pred, _Proj1, _Proj2>
+ _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(
+ _Range1&& __range1, _Range2&& __range2, _Pred __pred = {}, _Proj1 __proj1 = {}, _Proj2 __proj2 = {}) const {
+ auto __n1 = 0;
+ auto __n2 = 0;
+
+ if constexpr (sized_range<_Range1> && sized_range<_Range2>) {
+ __n1 = ranges::size(__range1);
+ __n2 = ranges::size(__range2);
+ } else {
+ __n1 = ranges::distance(ranges::begin(__range1), ranges::end(__range1));
+ __n2 = ranges::distance(ranges::begin(__range2), ranges::end(__range2));
+ }
+
+ auto __offset = __n1 - __n2;
+ return __contains_subrange_fn_impl(
+ ranges::begin(__range1),
+ ranges::end(__range1),
+ ranges::begin(__range2),
+ ranges::end(__range2),
+ __pred,
+ __proj1,
+ __proj2,
+ __offset);
+ }
+};
+} // namespace __contains_subrange
+
+inline namespace __cpo {
+inline constexpr auto contains_subrange = __contains_subrange::__fn{};
+} // namespace __cpo
+} // namespace ranges
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_STD_VER >= 23
+
+#endif // _LIBCPP___ALGORITHM_RANGES_CONTAINS_SUBRANGE_H
\ No newline at end of file
diff --git a/libcxx/include/algorithm b/libcxx/include/algorithm
index 1176602a2b6951..7c490ef40ac5f8 100644
--- a/libcxx/include/algorithm
+++ b/libcxx/include/algorithm
@@ -217,6 +217,19 @@ namespace ranges {
constexpr ranges::minmax_element_result<borrowed_iterator_t<R>>
minmax_element(R&& r, Comp comp = {}, Proj proj = {}); // since C++20
+ template<forward_iterator I1, sentinel_for<I1> S1, forward_iterator I2,
+ sentinel_for<I2> S2, class Pred = ranges::equal_to, class Proj1 = identity,
+ class Proj2 = identity>
+ requires indirectly_comparable<I1, I2, Pred, Proj1, Proj2>
+ constexpr bool ranges::contains_subrange(I1 first1, S1 last1, I2 first2,
+ S2 last2, Pred pred = {}, Proj1 proj1 = {}, Proj2 proj2 = {}); // since C++23
+
+ template<forward_range R1, forward_range R2,
+ class Pred = ranges::equal_to, class Proj1 = identity, class Proj2 = identity>
+ requires indirectly_comparable<iterator_t<R1>, iterator_t<R2>, Pred, Proj1, Proj2>
+ constexpr bool ranges::contains_subrange(R1&& r1, R2&& r2, Pred pred = {},
+ Proj1 proj1 = {}, Proj2 proj2 = {}); // since C++23
+
template<class I, class O>
using copy_result = in_out_result<I, O>; // since C++20
@@ -1875,6 +1888,7 @@ template <class BidirectionalIterator, class Compare>
#include <__algorithm/ranges_binary_search.h>
#include <__algorithm/ranges_clamp.h>
#include <__algorithm/ranges_contains.h>
+#include <__algorithm/ranges_contains_subrange.h>
#include <__algorithm/ranges_copy.h>
#include <__algorithm/ranges_copy_backward.h>
#include <__algorithm/ranges_copy_if.h>
diff --git a/libcxx/test/libcxx/algorithms/ranges_robust_against_copying_projections.pass.cpp b/libcxx/test/libcxx/algorithms/ranges_robust_against_copying_projections.pass.cpp
index e96a57f4005e04..cc031867b908a3 100644
--- a/libcxx/test/libcxx/algorithms/ranges_robust_against_copying_projections.pass.cpp
+++ b/libcxx/test/libcxx/algorithms/ranges_robust_against_copying_projections.pass.cpp
@@ -86,6 +86,8 @@ constexpr bool all_the_algorithms()
assert(copies == 0);
(void)std::ranges::contains(a, value, Proj(&copies));
assert(copies == 0);
+ (void)std::ranges::contains_subrange(first, last, first2, last2, Equal(), Proj(&copies), Proj(&copies)); assert(copies == 0);
+ (void)std::ranges::contains_subrange(a, b, Equal(), Proj(&copies), Proj(&copies)); assert(copies == 0);
#endif
(void)std::ranges::count(first, last, value, Proj(&copies)); assert(copies == 0);
(void)std::ranges::count(a, value, Proj(&copies)); assert(copies == 0);
diff --git a/libcxx/test/std/algorithms/alg.nonmodifying/alg.contains/ranges.contains_subrange.pass.cpp b/libcxx/test/std/algorithms/alg.nonmodifying/alg.contains/ranges.contains_subrange.pass.cpp
new file mode 100644
index 00000000000000..fd4d858b255db7
--- /dev/null
+++ b/libcxx/test/std/algorithms/alg.nonmodifying/alg.contains/ranges.contains_subrange.pass.cpp
@@ -0,0 +1,293 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+// <algorithm>
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+// ADDITIONAL_COMPILE_FLAGS(has-fconstexpr-steps): -fconstexpr-steps=2000000
+
+// template<input_iterator I, sentinel_for<I> S, class T, class Proj = identity>
+// requires indirect_binary_predicate<ranges::equal_to, projected<I, Proj>, const T*>
+// constexpr bool ranges::contains(I first, S last, const T& value, Proj proj = {}); // since C++23
+
+// template<input_range R, class T, class Proj = identity>
+// requires indirect_binary_predicate<ranges::equal_to, projected<iterator_t<R>, Proj>, const T*>
+// constexpr bool ranges::contains(R&& r, const T& value, Proj proj = {}); // since C++23
+
+#include <algorithm>
+#include <array>
+#include <cassert>
+#include <ranges>
+#include <vector>
+
+#include "almost_satisfies_types.h"
+#include "boolean_testable.h"
+#include "test_iterators.h"
+
+struct NotEqualityComparable {};
+
+template <class Iter1, class Sent1 = Iter1, class Iter2 = int*, class Sent2 = Iter2>
+concept HasContainsSubrangeSubrangeIt = requires(Iter1 first1, Sent1 last1, Iter2 first2, Sent2 last2) {
+ std::ranges::contains_subrange(first1, last1, first2, last2);
+};
+
+static_assert(HasContainsSubrangeSubrangeIt<int*>);
+static_assert(!HasContainsSubrangeSubrangeIt<NotEqualityComparable*>);
+static_assert(!HasContainsSubrangeSubrangeIt<InputIteratorNotDerivedFrom>);
+static_assert(!HasContainsSubrangeSubrangeIt<InputIteratorNotIndirectlyReadable>);
+static_assert(!HasContainsSubrangeSubrangeIt<InputIteratorNotInputOrOutputIterator>);
+static_assert(!HasContainsSubrangeSubrangeIt<cpp20_input_iterator<int*>, SentinelForNotSemiregular>);
+static_assert(!HasContainsSubrangeSubrangeIt<cpp20_input_iterator<int*>, InputRangeNotSentinelEqualityComparableWith>);
+static_assert(!HasContainsSubrangeSubrangeIt<cpp20_input_iterator<int*>, sentinel_wrapper<cpp20_input_iterator<int*>>>);
+
+static_assert(!HasContainsSubrangeSubrangeIt<int*, int>);
+static_assert(!HasContainsSubrangeSubrangeIt<int, int*>);
+static_assert(HasContainsSubrangeSubrangeIt<int*, int*>);
+
+template <class Range1, class Range2 = UncheckedRange<int*>>
+concept HasContainsSubrangeR = requires(Range1&& range1, Range2&& range2) {
+ std::ranges::contains_subrange(std::forward<Range1>(range1), std::forward<Range2>(range2)); };
+
+static_assert(HasContainsSubrangeR<UncheckedRange<int*>>);
+static_assert(HasContainsSubrangeR<ForwardRangeNotDerivedFrom>);
+static_assert(!HasContainsSubrangeR<ForwardIteratorNotIncrementable>);
+static_assert(!HasContainsSubrangeR<ForwardRangeNotSentinelSemiregular>);
+static_assert(!HasContainsSubrangeR<ForwardRangeNotSentinelEqualityComparableWith>);
+static_assert(!HasContainsSubrangeR<UncheckedRange<int*>, UncheckedRange<int**>>); // not indirectly comparable
+static_assert(HasContainsSubrangeR<UncheckedRange<int*>, ForwardRangeNotDerivedFrom>);
+static_assert(HasContainsSubrangeR<UncheckedRange<int*>, ForwardRangeNotIncrementable>);
+static_assert(!HasContainsSubrangeR<UncheckedRange<int*>, ForwardRangeNotSentinelSemiregular>);
+static_assert(!HasContainsSubrangeR<UncheckedRange<int*>, ForwardRangeNotSentinelEqualityComparableWith>);
+
+static std::vector<int> comparable_data;
+
+template <class Iter1, class Sent1 = Iter1, class Iter2, class Sent2 = Iter2>
+constexpr void test_iterators() {
+ { // simple tests
+ int a[] = {1, 2, 3, 4, 5, 6};
+ int p[] = {3, 4, 5};
+ auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 6)));
+ auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(p + 3)));
+ {
+ [[maybe_unused]] std::same_as<bool> decltype(auto) ret =
+ std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
+ assert(ret);
+ }
+ {
+ [[maybe_unused]] std::same_as<bool> decltype(auto) ret =
+ std::ranges::contains_subrange(whole, subrange);
+ assert(ret);
+ }
+ }
+
+ { // no match
+ int a[] = {1, 2, 3, 4, 5, 6};
+ int p[] = {3, 4, 2};
+ auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 6)));
+ auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(p + 3)));
+ {
+ bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
+ assert(!ret);
+ }
+ {
+ bool ret = std::ranges::contains_subrange(whole, subrange);
+ assert(!ret);
+ }
+ }
+
+ { // range consists of just one element
+ int a[] = {3};
+ int p[] = {3, 4, 2};
+ auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 1)));
+ auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(p + 3)));
+ {
+ bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
+ assert(!ret);
+ }
+ {
+ bool ret = std::ranges::contains_subrange(whole, subrange);
+ assert(!ret);
+ }
+ }
+
+ { // subrange consists of just one element
+ int a[] = {23, 1, 20, 3, 54, 2};
+ int p[] = {3};
+ auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 6)));
+ auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(p + 1)));
+ {
+ bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
+ assert(ret);
+ }
+ {
+ bool ret = std::ranges::contains_subrange(whole, subrange);
+ assert(ret);
+ }
+ }
+
+ { // range has zero length
+ int a[] = {};
+ int p[] = {3, 4, 2};
+ auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a)));
+ auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(p + 3)));
+ {
+ bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
+ assert(!ret);
+ }
+ {
+ bool ret = std::ranges::contains_subrange(whole, subrange);
+ assert(!ret);
+ }
+ }
+
+ { // subrange has zero length
+ int a[] = {3, 4, 2};
+ int p[] = {};
+ auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 3)));
+ auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(p)));
+ {
+ bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
+ assert(ret);
+ }
+ {
+ bool ret = std::ranges::contains_subrange(whole, subrange);
+ assert(ret);
+ }
+ }
+
+ { // range and subrange are identical
+ int a[] = {3, 4, 11, 32, 54, 2};
+ int p[] = {3, 4, 11, 32, 54, 2};
+ auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 6)));
+ auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(p + 6)));
+ {
+ bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
+ assert(ret);
+ }
+ {
+ bool ret = std::ranges::contains_subrange(whole, subrange);
+ assert(ret);
+ }
+ }
+
+ { // subrange is longer than range
+ int a[] = {3, 4, 2};
+ int p[] = {23, 3, 4, 2, 11, 32, 54, 2};
+ auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 3)));
+ auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(p + 8)));
+ {
+ bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
+ assert(!ret);
+ }
+ {
+ bool ret = std::ranges::contains_subrange(whole, subrange);
+ assert(!ret);
+ }
+ }
+
+ { // subrange is subsequence
+ int a[] = {23, 1, 0, 54, 2};
+ int p[] = {1, 0, 2};
+ auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 5)));
+ auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(p + 3)));
+ {
+ bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
+ assert(!ret);
+ }
+ {
+ bool ret = std::ranges::contains_subrange(whole, subrange);
+ assert(!ret);
+ }
+ }
+
+ { // repeated subrange
+ int a[] = {23, 1, 0, 2, 54, 1, 0, 2, 23, 33};
+ int p[] = {1, 0, 2};
+ auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 10)));
+ auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(p + 3)));
+ {
+ bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
+ assert(ret);
+ }
+ {
+ bool ret = std::ranges::contains_subrange(whole, subrange);
+ assert(ret);
+ }
+ }
+
+ { // check that the predicate is used
+ int a[] = {23, 81, 61, 0, 42, 25, 1, 2, 1, 29, 2};
+ int p[] = {-1, -2, -1};
+ auto pred = [](int l, int r) { return l * -1 == r; };
+ auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 11)));
+ auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(p + 3)));
+ {
+ bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end(), pred);
+ assert(ret);
+ }
+ {
+ bool ret = std::ranges::contains_subrange(whole, subrange, pred);
+ assert(ret);
+ }
+ }
+
+ { // check that the projections are used
+ int a[] = {1, 3, 15, 1, 2, 1, 8};
+ int p[] = {2, 1, 2};
+ auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 7)));
+ auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(p + 3)));
+ {
+ bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end(), {},
+ [](int i) { return i - 3; },
+ [](int i) { return i * -1; });
+ assert(ret);
+ }
+ {
+ bool ret = std::ranges::contains_subrange(whole, subrange, {},
+ [](int i) { return i - 3; },
+ [](int i) { return i * -1; });
+ assert(ret);
+ }
+ }
+
+ { // check the nodiscard extension
+ // use #pragma around to suppress error: ignoring return value of function
+ // declared with 'nodiscard' attribute [-Werror,-Wunused-result]
+ #pragma clang diagnostic push
+ #pragma clang diagnostic ignored "-Wunused-result"
+ int a[] = {1, 9, 0, 13, 25};
+ int p[] = {1, 9, 0};
+ auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 5)));
+ auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(p + 3)));
+ std::ranges::contains_subrange(whole, subrange);
+ #pragma clang diagnostic pop
+ }
+}
+
+constexpr bool test() {
+ types::for_each(types::cpp20_input_iterator_list<int*>{}, []<class Iter2>() {
+ types::for_each(types::cpp20_input_iterator_list<int*>{}, []<class Iter1>() {
+ if constexpr (std::forward_iterator<Iter1> && std::forward_iterator<Iter2>)
+ test_iterators<Iter1, Iter1, Iter2, Iter2>();
+ if constexpr (std::forward_iterator<Iter2>)
+ test_iterators<Iter1, sized_sentinel<Iter1>, Iter2, Iter2>();
+ if constexpr (std::forward_iterator<Iter1>)
+ test_iterators<Iter1, Iter1, Iter2, sized_sentinel<Iter2>>();
+ test_iterators<Iter1, sized_sentinel<Iter1>, Iter2, sized_sentinel<Iter2>>();
+ });
+ });
+
+ return true;
+}
+
+int main(int, char**) {
+ test();
+ static_assert(test());
+
+ return 0;
+}
\ No newline at end of file
diff --git a/libcxx/test/std/library/description/conventions/customization.point.object/niebloid.compile.pass.cpp b/libcxx/test/std/library/description/conventions/customization.point.object/niebloid.compile.pass.cpp
index 494e9fd19c3545..9506ca1c768bd7 100644
--- a/libcxx/test/std/library/description/conventions/customization.point.object/niebloid.compile.pass.cpp
+++ b/libcxx/test/std/library/description/conventions/customization.point.object/niebloid.compile.pass.cpp
@@ -67,6 +67,7 @@ static_assert(test(std::ranges::binary_search, a, 42));
static_assert(test(std::ranges::clamp, 42, 42, 42));
#if TEST_STD_VER >= 23
static_assert(test(std::ranges::contains, a, 42));
+static_assert(test(std::ranges::contains_subrange, a, a));
#endif
static_assert(test(std::ranges::copy, a, a));
static_assert(test(std::ranges::copy_backward, a, a));
>From 5a1d555e0cdf070ee415e9c1b1e8c928d79e4d71 Mon Sep 17 00:00:00 2001
From: Zijun Zhao <zijunzhao at google.com>
Date: Wed, 20 Sep 2023 18:41:04 -0700
Subject: [PATCH 2/7] format
---
libcxx/include/__algorithm/ranges_contains_subrange.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libcxx/include/__algorithm/ranges_contains_subrange.h b/libcxx/include/__algorithm/ranges_contains_subrange.h
index 16de6c29cb2a1a..f8e885d3259be6 100644
--- a/libcxx/include/__algorithm/ranges_contains_subrange.h
+++ b/libcxx/include/__algorithm/ranges_contains_subrange.h
@@ -129,7 +129,7 @@ struct __fn {
__proj1,
__proj2,
__offset);
- }
+ }
};
} // namespace __contains_subrange
>From 7cb4d06f6c801a52e239f5f2a780001f73c25e30 Mon Sep 17 00:00:00 2001
From: Zijun Zhao <zijunzhao at google.com>
Date: Thu, 21 Sep 2023 11:06:02 -0700
Subject: [PATCH 3/7] Add a newline
---
libcxx/include/__algorithm/ranges_contains_subrange.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libcxx/include/__algorithm/ranges_contains_subrange.h b/libcxx/include/__algorithm/ranges_contains_subrange.h
index f8e885d3259be6..8fdd460c8d6f34 100644
--- a/libcxx/include/__algorithm/ranges_contains_subrange.h
+++ b/libcxx/include/__algorithm/ranges_contains_subrange.h
@@ -142,4 +142,4 @@ _LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_STD_VER >= 23
-#endif // _LIBCPP___ALGORITHM_RANGES_CONTAINS_SUBRANGE_H
\ No newline at end of file
+#endif // _LIBCPP___ALGORITHM_RANGES_CONTAINS_SUBRANGE_H
>From aee12dd713093aad9f8b1e7b8281f50235047982 Mon Sep 17 00:00:00 2001
From: Zijun Zhao <zijunzhao at google.com>
Date: Tue, 26 Sep 2023 16:56:38 -0700
Subject: [PATCH 4/7] 1. call distance(r) directly 2. replace auto with int to
avoid potential errors
---
.../__algorithm/ranges_contains_subrange.h | 18 +++++++++---------
1 file changed, 9 insertions(+), 9 deletions(-)
diff --git a/libcxx/include/__algorithm/ranges_contains_subrange.h b/libcxx/include/__algorithm/ranges_contains_subrange.h
index 8fdd460c8d6f34..6dd8324c5dfa69 100644
--- a/libcxx/include/__algorithm/ranges_contains_subrange.h
+++ b/libcxx/include/__algorithm/ranges_contains_subrange.h
@@ -40,7 +40,7 @@ struct __fn {
class _Pred,
class _Proj1,
class _Proj2,
- class _Offset>
+ class _Offset = int>
static _LIBCPP_HIDE_FROM_ABI constexpr bool __contains_subrange_fn_impl(
_Iter1 __first1,
_Sent1 __last1,
@@ -85,9 +85,9 @@ struct __fn {
_Pred __pred = {},
_Proj1 __proj1 = {},
_Proj2 __proj2 = {}) const {
- auto __n1 = ranges::distance(__first1, __last1);
- auto __n2 = ranges::distance(__first2, __last2);
- auto __offset = __n1 - __n2;
+ int __n1 = ranges::distance(__first1, __last1);
+ int __n2 = ranges::distance(__first2, __last2);
+ int __offset = __n1 - __n2;
return __contains_subrange_fn_impl(
std::move(__first1),
@@ -108,18 +108,18 @@ struct __fn {
requires indirectly_comparable<iterator_t<_Range1>, iterator_t<_Range2>, _Pred, _Proj1, _Proj2>
_LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(
_Range1&& __range1, _Range2&& __range2, _Pred __pred = {}, _Proj1 __proj1 = {}, _Proj2 __proj2 = {}) const {
- auto __n1 = 0;
- auto __n2 = 0;
+ int __n1 = 0;
+ int __n2 = 0;
if constexpr (sized_range<_Range1> && sized_range<_Range2>) {
__n1 = ranges::size(__range1);
__n2 = ranges::size(__range2);
} else {
- __n1 = ranges::distance(ranges::begin(__range1), ranges::end(__range1));
- __n2 = ranges::distance(ranges::begin(__range2), ranges::end(__range2));
+ __n1 = ranges::distance(__range1);
+ __n2 = ranges::distance(__range2);
}
- auto __offset = __n1 - __n2;
+ int __offset = __n1 - __n2;
return __contains_subrange_fn_impl(
ranges::begin(__range1),
ranges::end(__range1),
>From b2c57a20557fd7d7af15eafc0a11ba6bd4c3a333 Mon Sep 17 00:00:00 2001
From: Zijun Zhao <zijunzhao at google.com>
Date: Sun, 1 Oct 2023 22:41:08 -0700
Subject: [PATCH 5/7] Reformat
---
.../ranges.contains_subrange.pass.cpp | 115 +++++++++---------
1 file changed, 59 insertions(+), 56 deletions(-)
diff --git a/libcxx/test/std/algorithms/alg.nonmodifying/alg.contains/ranges.contains_subrange.pass.cpp b/libcxx/test/std/algorithms/alg.nonmodifying/alg.contains/ranges.contains_subrange.pass.cpp
index fd4d858b255db7..172c30ad8b979c 100644
--- a/libcxx/test/std/algorithms/alg.nonmodifying/alg.contains/ranges.contains_subrange.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.nonmodifying/alg.contains/ranges.contains_subrange.pass.cpp
@@ -51,7 +51,7 @@ static_assert(HasContainsSubrangeSubrangeIt<int*, int*>);
template <class Range1, class Range2 = UncheckedRange<int*>>
concept HasContainsSubrangeR = requires(Range1&& range1, Range2&& range2) {
- std::ranges::contains_subrange(std::forward<Range1>(range1), std::forward<Range2>(range2)); };
+ std::ranges::contains_subrange(std::forward<Range1>(range1), std::forward<Range2>(range2)); };
static_assert(HasContainsSubrangeR<UncheckedRange<int*>>);
static_assert(HasContainsSubrangeR<ForwardRangeNotDerivedFrom>);
@@ -69,26 +69,25 @@ static std::vector<int> comparable_data;
template <class Iter1, class Sent1 = Iter1, class Iter2, class Sent2 = Iter2>
constexpr void test_iterators() {
{ // simple tests
- int a[] = {1, 2, 3, 4, 5, 6};
- int p[] = {3, 4, 5};
- auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 6)));
+ int a[] = {1, 2, 3, 4, 5, 6};
+ int p[] = {3, 4, 5};
+ auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 6)));
auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(p + 3)));
{
[[maybe_unused]] std::same_as<bool> decltype(auto) ret =
- std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
+ std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
assert(ret);
}
{
- [[maybe_unused]] std::same_as<bool> decltype(auto) ret =
- std::ranges::contains_subrange(whole, subrange);
+ [[maybe_unused]] std::same_as<bool> decltype(auto) ret = std::ranges::contains_subrange(whole, subrange);
assert(ret);
}
}
{ // no match
- int a[] = {1, 2, 3, 4, 5, 6};
- int p[] = {3, 4, 2};
- auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 6)));
+ int a[] = {1, 2, 3, 4, 5, 6};
+ int p[] = {3, 4, 2};
+ auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 6)));
auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(p + 3)));
{
bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
@@ -101,9 +100,9 @@ constexpr void test_iterators() {
}
{ // range consists of just one element
- int a[] = {3};
- int p[] = {3, 4, 2};
- auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 1)));
+ int a[] = {3};
+ int p[] = {3, 4, 2};
+ auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 1)));
auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(p + 3)));
{
bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
@@ -116,9 +115,9 @@ constexpr void test_iterators() {
}
{ // subrange consists of just one element
- int a[] = {23, 1, 20, 3, 54, 2};
- int p[] = {3};
- auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 6)));
+ int a[] = {23, 1, 20, 3, 54, 2};
+ int p[] = {3};
+ auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 6)));
auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(p + 1)));
{
bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
@@ -131,9 +130,9 @@ constexpr void test_iterators() {
}
{ // range has zero length
- int a[] = {};
- int p[] = {3, 4, 2};
- auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a)));
+ int a[] = {};
+ int p[] = {3, 4, 2};
+ auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a)));
auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(p + 3)));
{
bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
@@ -146,9 +145,9 @@ constexpr void test_iterators() {
}
{ // subrange has zero length
- int a[] = {3, 4, 2};
- int p[] = {};
- auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 3)));
+ int a[] = {3, 4, 2};
+ int p[] = {};
+ auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 3)));
auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(p)));
{
bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
@@ -161,9 +160,9 @@ constexpr void test_iterators() {
}
{ // range and subrange are identical
- int a[] = {3, 4, 11, 32, 54, 2};
- int p[] = {3, 4, 11, 32, 54, 2};
- auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 6)));
+ int a[] = {3, 4, 11, 32, 54, 2};
+ int p[] = {3, 4, 11, 32, 54, 2};
+ auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 6)));
auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(p + 6)));
{
bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
@@ -176,9 +175,9 @@ constexpr void test_iterators() {
}
{ // subrange is longer than range
- int a[] = {3, 4, 2};
- int p[] = {23, 3, 4, 2, 11, 32, 54, 2};
- auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 3)));
+ int a[] = {3, 4, 2};
+ int p[] = {23, 3, 4, 2, 11, 32, 54, 2};
+ auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 3)));
auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(p + 8)));
{
bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
@@ -191,9 +190,9 @@ constexpr void test_iterators() {
}
{ // subrange is subsequence
- int a[] = {23, 1, 0, 54, 2};
- int p[] = {1, 0, 2};
- auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 5)));
+ int a[] = {23, 1, 0, 54, 2};
+ int p[] = {1, 0, 2};
+ auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 5)));
auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(p + 3)));
{
bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
@@ -206,9 +205,9 @@ constexpr void test_iterators() {
}
{ // repeated subrange
- int a[] = {23, 1, 0, 2, 54, 1, 0, 2, 23, 33};
- int p[] = {1, 0, 2};
- auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 10)));
+ int a[] = {23, 1, 0, 2, 54, 1, 0, 2, 23, 33};
+ int p[] = {1, 0, 2};
+ auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 10)));
auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(p + 3)));
{
bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
@@ -221,10 +220,10 @@ constexpr void test_iterators() {
}
{ // check that the predicate is used
- int a[] = {23, 81, 61, 0, 42, 25, 1, 2, 1, 29, 2};
- int p[] = {-1, -2, -1};
- auto pred = [](int l, int r) { return l * -1 == r; };
- auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 11)));
+ int a[] = {23, 81, 61, 0, 42, 25, 1, 2, 1, 29, 2};
+ int p[] = {-1, -2, -1};
+ auto pred = [](int l, int r) { return l * -1 == r; };
+ auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 11)));
auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(p + 3)));
{
bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end(), pred);
@@ -237,40 +236,44 @@ constexpr void test_iterators() {
}
{ // check that the projections are used
- int a[] = {1, 3, 15, 1, 2, 1, 8};
- int p[] = {2, 1, 2};
- auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 7)));
+ int a[] = {1, 3, 15, 1, 2, 1, 8};
+ int p[] = {2, 1, 2};
+ auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 7)));
auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(p + 3)));
{
- bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end(), {},
- [](int i) { return i - 3; },
- [](int i) { return i * -1; });
+ bool ret = std::ranges::contains_subrange(
+ whole.begin(),
+ whole.end(),
+ subrange.begin(),
+ subrange.end(),
+ {},
+ [](int i) { return i - 3; },
+ [](int i) { return i * -1; });
assert(ret);
}
{
- bool ret = std::ranges::contains_subrange(whole, subrange, {},
- [](int i) { return i - 3; },
- [](int i) { return i * -1; });
+ bool ret = std::ranges::contains_subrange(
+ whole, subrange, {}, [](int i) { return i - 3; }, [](int i) { return i * -1; });
assert(ret);
}
}
{ // check the nodiscard extension
- // use #pragma around to suppress error: ignoring return value of function
- // declared with 'nodiscard' attribute [-Werror,-Wunused-result]
- #pragma clang diagnostic push
- #pragma clang diagnostic ignored "-Wunused-result"
- int a[] = {1, 9, 0, 13, 25};
- int p[] = {1, 9, 0};
- auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 5)));
+// use #pragma around to suppress error: ignoring return value of function
+// declared with 'nodiscard' attribute [-Werror,-Wunused-result]
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunused-result"
+ int a[] = {1, 9, 0, 13, 25};
+ int p[] = {1, 9, 0};
+ auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 5)));
auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(p + 3)));
std::ranges::contains_subrange(whole, subrange);
- #pragma clang diagnostic pop
+#pragma clang diagnostic pop
}
}
constexpr bool test() {
- types::for_each(types::cpp20_input_iterator_list<int*>{}, []<class Iter2>() {
+ types::for_each(types::cpp20_input_iterator_list<int*>{}, []<class Iter2>() {
types::for_each(types::cpp20_input_iterator_list<int*>{}, []<class Iter1>() {
if constexpr (std::forward_iterator<Iter1> && std::forward_iterator<Iter2>)
test_iterators<Iter1, Iter1, Iter2, Iter2>();
>From ae96c2f72baaddc9dd121cd645b15b45a44c23a6 Mon Sep 17 00:00:00 2001
From: Zijun Zhao <zijunzhao at google.com>
Date: Mon, 2 Oct 2023 17:45:39 -0700
Subject: [PATCH 6/7] Correct input type and call ranges::search()
---
.../__algorithm/ranges_contains_subrange.h | 40 ++++++------
.../ranges.contains_subrange.pass.cpp | 65 ++++++++++---------
2 files changed, 56 insertions(+), 49 deletions(-)
diff --git a/libcxx/include/__algorithm/ranges_contains_subrange.h b/libcxx/include/__algorithm/ranges_contains_subrange.h
index 6dd8324c5dfa69..d4fcb8c08a24aa 100644
--- a/libcxx/include/__algorithm/ranges_contains_subrange.h
+++ b/libcxx/include/__algorithm/ranges_contains_subrange.h
@@ -9,7 +9,7 @@
#ifndef _LIBCPP___ALGORITHM_RANGES_CONTAINS_SUBRANGE_H
#define _LIBCPP___ALGORITHM_RANGES_CONTAINS_SUBRANGE_H
-#include <__algorithm/ranges_starts_with.h>
+#include <__algorithm/ranges_search.h>
#include <__config>
#include <__functional/identity.h>
#include <__functional/ranges_operations.h>
@@ -33,9 +33,9 @@ _LIBCPP_BEGIN_NAMESPACE_STD
namespace ranges {
namespace __contains_subrange {
struct __fn {
- template <input_iterator _Iter1,
+ template <forward_iterator _Iter1,
sentinel_for<_Iter1> _Sent1,
- input_iterator _Iter2,
+ forward_iterator _Iter2,
sentinel_for<_Iter2> _Sent2,
class _Pred,
class _Proj1,
@@ -53,25 +53,21 @@ struct __fn {
if (__offset < 0)
return false;
else {
- for (; __offset >= 0; __offset--, __first1++) {
- auto result = ranges::starts_with(
- std::move(__first1),
- std::move(__last1),
- std::move(__first2),
- std::move(__last2),
- std::ref(__pred),
- std::ref(__proj1),
- std::ref(__proj2));
- if (result)
- return true;
- }
- return false;
+ auto result = ranges::search(
+ std::move(__first1),
+ std::move(__last1),
+ std::move(__first2),
+ std::move(__last2),
+ std::ref(__pred),
+ std::ref(__proj1),
+ std::ref(__proj2));
+ return result.empty() == false;
}
}
- template <input_iterator _Iter1,
+ template <forward_iterator _Iter1,
sentinel_for<_Iter1> _Sent1,
- input_iterator _Iter2,
+ forward_iterator _Iter2,
sentinel_for<_Iter2> _Sent2,
class _Pred = ranges::equal_to,
class _Proj1 = identity,
@@ -87,6 +83,8 @@ struct __fn {
_Proj2 __proj2 = {}) const {
int __n1 = ranges::distance(__first1, __last1);
int __n2 = ranges::distance(__first2, __last2);
+ if (__n2 == 0)
+ return true;
int __offset = __n1 - __n2;
return __contains_subrange_fn_impl(
@@ -100,8 +98,8 @@ struct __fn {
std::move(__offset));
}
- template <input_range _Range1,
- input_range _Range2,
+ template <forward_range _Range1,
+ forward_range _Range2,
class _Pred = ranges::equal_to,
class _Proj1 = identity,
class _Proj2 = identity>
@@ -119,6 +117,8 @@ struct __fn {
__n2 = ranges::distance(__range2);
}
+ if (__n2 == 0)
+ return true;
int __offset = __n1 - __n2;
return __contains_subrange_fn_impl(
ranges::begin(__range1),
diff --git a/libcxx/test/std/algorithms/alg.nonmodifying/alg.contains/ranges.contains_subrange.pass.cpp b/libcxx/test/std/algorithms/alg.nonmodifying/alg.contains/ranges.contains_subrange.pass.cpp
index 172c30ad8b979c..0b7a2359b2b666 100644
--- a/libcxx/test/std/algorithms/alg.nonmodifying/alg.contains/ranges.contains_subrange.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.nonmodifying/alg.contains/ranges.contains_subrange.pass.cpp
@@ -32,40 +32,36 @@
struct NotEqualityComparable {};
template <class Iter1, class Sent1 = Iter1, class Iter2 = int*, class Sent2 = Iter2>
-concept HasContainsSubrangeSubrangeIt = requires(Iter1 first1, Sent1 last1, Iter2 first2, Sent2 last2) {
+concept HasContainsSubrangeIt = requires(Iter1 first1, Sent1 last1, Iter2 first2, Sent2 last2) {
std::ranges::contains_subrange(first1, last1, first2, last2);
};
-static_assert(HasContainsSubrangeSubrangeIt<int*>);
-static_assert(!HasContainsSubrangeSubrangeIt<NotEqualityComparable*>);
-static_assert(!HasContainsSubrangeSubrangeIt<InputIteratorNotDerivedFrom>);
-static_assert(!HasContainsSubrangeSubrangeIt<InputIteratorNotIndirectlyReadable>);
-static_assert(!HasContainsSubrangeSubrangeIt<InputIteratorNotInputOrOutputIterator>);
-static_assert(!HasContainsSubrangeSubrangeIt<cpp20_input_iterator<int*>, SentinelForNotSemiregular>);
-static_assert(!HasContainsSubrangeSubrangeIt<cpp20_input_iterator<int*>, InputRangeNotSentinelEqualityComparableWith>);
-static_assert(!HasContainsSubrangeSubrangeIt<cpp20_input_iterator<int*>, sentinel_wrapper<cpp20_input_iterator<int*>>>);
-
-static_assert(!HasContainsSubrangeSubrangeIt<int*, int>);
-static_assert(!HasContainsSubrangeSubrangeIt<int, int*>);
-static_assert(HasContainsSubrangeSubrangeIt<int*, int*>);
+static_assert(HasContainsSubrangeIt<int*>);
+static_assert(!HasContainsSubrangeIt<ForwardIteratorNotDerivedFrom>);
+static_assert(!HasContainsSubrangeIt<ForwardIteratorNotIncrementable>);
+static_assert(!HasContainsSubrangeIt<int*, SentinelForNotSemiregular>);
+static_assert(!HasContainsSubrangeIt<int*, int*, int**>); // not indirectly comparable
+static_assert(!HasContainsSubrangeIt<int*, SentinelForNotWeaklyEqualityComparableWith>);
+static_assert(!HasContainsSubrangeIt<int*, int*, ForwardIteratorNotDerivedFrom>);
+static_assert(!HasContainsSubrangeIt<int*, int*, ForwardIteratorNotIncrementable>);
+static_assert(!HasContainsSubrangeIt<int*, int*, int*, SentinelForNotSemiregular>);
+static_assert(!HasContainsSubrangeIt<int*, int*, int*, SentinelForNotWeaklyEqualityComparableWith>);
template <class Range1, class Range2 = UncheckedRange<int*>>
concept HasContainsSubrangeR = requires(Range1&& range1, Range2&& range2) {
std::ranges::contains_subrange(std::forward<Range1>(range1), std::forward<Range2>(range2)); };
static_assert(HasContainsSubrangeR<UncheckedRange<int*>>);
-static_assert(HasContainsSubrangeR<ForwardRangeNotDerivedFrom>);
+static_assert(!HasContainsSubrangeR<ForwardRangeNotDerivedFrom>);
static_assert(!HasContainsSubrangeR<ForwardIteratorNotIncrementable>);
static_assert(!HasContainsSubrangeR<ForwardRangeNotSentinelSemiregular>);
static_assert(!HasContainsSubrangeR<ForwardRangeNotSentinelEqualityComparableWith>);
static_assert(!HasContainsSubrangeR<UncheckedRange<int*>, UncheckedRange<int**>>); // not indirectly comparable
-static_assert(HasContainsSubrangeR<UncheckedRange<int*>, ForwardRangeNotDerivedFrom>);
-static_assert(HasContainsSubrangeR<UncheckedRange<int*>, ForwardRangeNotIncrementable>);
+static_assert(!HasContainsSubrangeR<UncheckedRange<int*>, ForwardRangeNotDerivedFrom>);
+static_assert(!HasContainsSubrangeR<UncheckedRange<int*>, ForwardRangeNotIncrementable>);
static_assert(!HasContainsSubrangeR<UncheckedRange<int*>, ForwardRangeNotSentinelSemiregular>);
static_assert(!HasContainsSubrangeR<UncheckedRange<int*>, ForwardRangeNotSentinelEqualityComparableWith>);
-static std::vector<int> comparable_data;
-
template <class Iter1, class Sent1 = Iter1, class Iter2, class Sent2 = Iter2>
constexpr void test_iterators() {
{ // simple tests
@@ -272,18 +268,29 @@ constexpr void test_iterators() {
}
}
+template <class Iter1, class Sent1 = Iter1>
+constexpr void test_iterators2() {
+ test_iterators<Iter1, Sent1, forward_iterator<int*>>();
+ test_iterators<Iter1, Sent1, forward_iterator<int*>, sized_sentinel<forward_iterator<int*>>>();
+ test_iterators<Iter1, Sent1, bidirectional_iterator<int*>>();
+ test_iterators<Iter1, Sent1, bidirectional_iterator<int*>, sized_sentinel<bidirectional_iterator<int*>>>();
+ test_iterators<Iter1, Sent1, random_access_iterator<int*>>();
+ test_iterators<Iter1, Sent1, random_access_iterator<int*>, sized_sentinel<random_access_iterator<int*>>>();
+ test_iterators<Iter1, Sent1, contiguous_iterator<int*>>();
+ test_iterators<Iter1, Sent1, contiguous_iterator<int*>, sized_sentinel<contiguous_iterator<int*>>>();
+ test_iterators<Iter1, Sent1, int*>();
+}
+
constexpr bool test() {
- types::for_each(types::cpp20_input_iterator_list<int*>{}, []<class Iter2>() {
- types::for_each(types::cpp20_input_iterator_list<int*>{}, []<class Iter1>() {
- if constexpr (std::forward_iterator<Iter1> && std::forward_iterator<Iter2>)
- test_iterators<Iter1, Iter1, Iter2, Iter2>();
- if constexpr (std::forward_iterator<Iter2>)
- test_iterators<Iter1, sized_sentinel<Iter1>, Iter2, Iter2>();
- if constexpr (std::forward_iterator<Iter1>)
- test_iterators<Iter1, Iter1, Iter2, sized_sentinel<Iter2>>();
- test_iterators<Iter1, sized_sentinel<Iter1>, Iter2, sized_sentinel<Iter2>>();
- });
- });
+ test_iterators2<forward_iterator<int*>>();
+ test_iterators2<forward_iterator<int*>, sized_sentinel<forward_iterator<int*>>>();
+ test_iterators2<bidirectional_iterator<int*>>();
+ test_iterators2<bidirectional_iterator<int*>, sized_sentinel<bidirectional_iterator<int*>>>();
+ test_iterators2<random_access_iterator<int*>>();
+ test_iterators2<random_access_iterator<int*>, sized_sentinel<random_access_iterator<int*>>>();
+ test_iterators2<contiguous_iterator<int*>>();
+ test_iterators2<contiguous_iterator<int*>, sized_sentinel<contiguous_iterator<int*>>>();
+ test_iterators2<int*>();
return true;
}
>From 11384e6c94e5e297050dd1b4beace6e628caebb2 Mon Sep 17 00:00:00 2001
From: Zijun Zhao <zijunzhao at google.com>
Date: Wed, 3 Jan 2024 19:00:40 -0800
Subject: [PATCH 7/7] 1. update function 2. add nondiscard tests
---
libcxx/include/__algorithm/ranges_contains_subrange.h | 2 +-
.../diagnostics/ranges.nodiscard_extensions.compile.pass.cpp | 2 ++
.../libcxx/diagnostics/ranges.nodiscard_extensions.verify.cpp | 4 ++++
3 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/libcxx/include/__algorithm/ranges_contains_subrange.h b/libcxx/include/__algorithm/ranges_contains_subrange.h
index d4fcb8c08a24aa..23c5ea767de114 100644
--- a/libcxx/include/__algorithm/ranges_contains_subrange.h
+++ b/libcxx/include/__algorithm/ranges_contains_subrange.h
@@ -61,7 +61,7 @@ struct __fn {
std::ref(__pred),
std::ref(__proj1),
std::ref(__proj2));
- return result.empty() == false;
+ return !result.empty();
}
}
diff --git a/libcxx/test/libcxx/diagnostics/ranges.nodiscard_extensions.compile.pass.cpp b/libcxx/test/libcxx/diagnostics/ranges.nodiscard_extensions.compile.pass.cpp
index 7e2d64b8c9b618..790260d209a95d 100644
--- a/libcxx/test/libcxx/diagnostics/ranges.nodiscard_extensions.compile.pass.cpp
+++ b/libcxx/test/libcxx/diagnostics/ranges.nodiscard_extensions.compile.pass.cpp
@@ -28,6 +28,8 @@ void test() {
std::ranges::binary_search(range, 1);
std::ranges::binary_search(iter, iter, 1);
std::ranges::clamp(1, 2, 3);
+ std::ranges::contains_subrange(range, range);
+ std::ranges::contains_subrange(iter, iter, iter, iter);
std::ranges::count_if(range, pred);
std::ranges::count_if(iter, iter, pred);
std::ranges::count(range, 1);
diff --git a/libcxx/test/libcxx/diagnostics/ranges.nodiscard_extensions.verify.cpp b/libcxx/test/libcxx/diagnostics/ranges.nodiscard_extensions.verify.cpp
index f0a0e4889a7603..c41461fff516fa 100644
--- a/libcxx/test/libcxx/diagnostics/ranges.nodiscard_extensions.verify.cpp
+++ b/libcxx/test/libcxx/diagnostics/ranges.nodiscard_extensions.verify.cpp
@@ -91,6 +91,10 @@ void test() {
std::ranges::upper_bound(iter, iter, 1); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
#if TEST_STD_VER >= 23
+ std::ranges::contains_subrange(range, range);
+ // expected-warning at -1 {{ignoring return value of function declared with 'nodiscard' attribute}}
+ std::ranges::contains_subrange(iter, iter, iter, iter);
+ // expected-warning at -1 {{ignoring return value of function declared with 'nodiscard' attribute}}
std::ranges::fold_left(range, 0, std::plus());
// expected-warning at -1{{ignoring return value of function declared with 'nodiscard' attribute}}
std::ranges::fold_left(iter, iter, 0, std::plus());
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