d2baefae68
All supported compilers that support C++20 now support concepts. So, remove `_LIB_LIBCPP_HAS_NO_CONCEPTS` in favor of `_LIBCPP_STD_VER > 17`. Similarly in the tests, remove `// UNSUPPORTED: libcpp-no-concepts`. Differential Revision: https://reviews.llvm.org/D121528
114 lines
2.8 KiB
C++
114 lines
2.8 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// UNSUPPORTED: libcpp-has-no-incomplete-ranges
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// class std::ranges::subrange;
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#include <cassert>
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#include <ranges>
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#include <utility>
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#include "test_macros.h"
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constexpr void test_sized_subrange()
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{
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int a[4] = {1,2,3,4};
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auto r = std::ranges::subrange(a, a+4);
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assert(std::ranges::sized_range<decltype(r)>);
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{
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auto [first, last] = r;
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assert(first == a);
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assert(last == a+4);
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}
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{
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auto [first, last] = std::move(r);
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assert(first == a);
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assert(last == a+4);
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}
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{
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auto [first, last] = std::as_const(r);
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assert(first == a);
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assert(last == a+4);
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}
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{
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auto [first, last] = std::move(std::as_const(r));
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assert(first == a);
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assert(last == a+4);
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}
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}
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constexpr void test_unsized_subrange()
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{
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int a[4] = {1,2,3,4};
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auto r = std::ranges::subrange(a, std::unreachable_sentinel);
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assert(!std::ranges::sized_range<decltype(r)>);
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{
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auto [first, last] = r;
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assert(first == a);
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ASSERT_SAME_TYPE(decltype(last), std::unreachable_sentinel_t);
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}
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{
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auto [first, last] = std::move(r);
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assert(first == a);
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ASSERT_SAME_TYPE(decltype(last), std::unreachable_sentinel_t);
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}
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{
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auto [first, last] = std::as_const(r);
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assert(first == a);
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ASSERT_SAME_TYPE(decltype(last), std::unreachable_sentinel_t);
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}
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{
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auto [first, last] = std::move(std::as_const(r));
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assert(first == a);
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ASSERT_SAME_TYPE(decltype(last), std::unreachable_sentinel_t);
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}
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}
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constexpr void test_copies_not_originals()
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{
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int a[4] = {1,2,3,4};
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{
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auto r = std::ranges::subrange(a, a+4);
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auto&& [first, last] = r;
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ASSERT_SAME_TYPE(decltype(first), int*);
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ASSERT_SAME_TYPE(decltype(last), int*);
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first = a+2;
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last = a+2;
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assert(r.begin() == a);
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assert(r.end() == a+4);
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}
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{
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const auto r = std::ranges::subrange(a, a+4);
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auto&& [first, last] = r;
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ASSERT_SAME_TYPE(decltype(first), int*);
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ASSERT_SAME_TYPE(decltype(last), int*);
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first = a+2;
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last = a+2;
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assert(r.begin() == a);
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assert(r.end() == a+4);
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}
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}
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constexpr bool test()
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{
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test_sized_subrange();
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test_unsized_subrange();
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test_copies_not_originals();
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return true;
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}
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int main(int, char**)
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{
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test();
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static_assert(test());
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return 0;
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}
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