| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| // UNSUPPORTED: libcpp-no-concepts |
| // UNSUPPORTED: libcpp-has-no-incomplete-ranges |
| |
| // template<borrowed_range R> |
| // requires convertible-to-non-slicing<iterator_t<R>, I> && |
| // convertible_to<sentinel_t<R>, S> |
| // constexpr subrange(R&& r, make-unsigned-like-t<iter_difference_t<I>> n) |
| // requires (K == subrange_kind::sized); |
| |
| #include <ranges> |
| #include <cassert> |
| |
| struct BorrowedRange { |
| constexpr explicit BorrowedRange(int* b, int* e) : begin_(b), end_(e) { } |
| constexpr int* begin() const { return begin_; } |
| constexpr int* end() const { return end_; } |
| |
| private: |
| int* begin_; |
| int* end_; |
| }; |
| |
| namespace std::ranges { |
| template <> |
| inline constexpr bool enable_borrowed_range<::BorrowedRange> = true; |
| } |
| |
| constexpr bool test() { |
| int buff[] = {1, 2, 3, 4, 5, 6, 7, 8}; |
| using Subrange = std::ranges::subrange<int*, int*, std::ranges::subrange_kind::sized>; |
| |
| // Test with an empty range |
| { |
| BorrowedRange range(buff, buff); |
| Subrange subrange(range, 0); |
| assert(subrange.size() == 0); |
| } |
| |
| // Test with non-empty ranges |
| { |
| BorrowedRange range(buff, buff + 1); |
| Subrange subrange(range, 1); |
| assert(subrange.size() == 1); |
| } |
| { |
| BorrowedRange range(buff, buff + 2); |
| Subrange subrange(range, 2); |
| assert(subrange[0] == 1); |
| assert(subrange[1] == 2); |
| assert(subrange.size() == 2); |
| } |
| { |
| BorrowedRange range(buff, buff + 8); |
| Subrange subrange(range, 8); |
| assert(subrange[0] == 1); |
| assert(subrange[1] == 2); |
| // ... |
| assert(subrange[7] == 8); |
| assert(subrange.size() == 8); |
| } |
| |
| return true; |
| } |
| |
| int main(int, char**) { |
| test(); |
| static_assert(test()); |
| |
| return 0; |
| } |