51 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9// UNSUPPORTED: c++03, c++11, c++14, c++1710 11// class std::ranges::subrange;12 13#include <ranges>14 15#include <cassert>16#include <cstddef>17 18#include "test_iterators.h"19 20using FI = forward_iterator<int*>;21FI fi{nullptr};22int *ptr = nullptr;23 24static_assert(std::same_as<decltype(std::ranges::subrange(fi, fi)),25 std::ranges::subrange<FI, FI, std::ranges::subrange_kind::unsized>>);26static_assert(std::same_as<decltype(std::ranges::subrange(ptr, ptr, 0)),27 std::ranges::subrange<int*, int*, std::ranges::subrange_kind::sized>>);28static_assert(std::same_as<decltype(std::ranges::subrange(ptr, nullptr, 0)),29 std::ranges::subrange<int*, std::nullptr_t, std::ranges::subrange_kind::sized>>);30 31struct ForwardRange {32 forward_iterator<int*> begin() const;33 forward_iterator<int*> end() const;34};35template<>36inline constexpr bool std::ranges::enable_borrowed_range<ForwardRange> = true;37 38struct SizedRange {39 int *begin();40 int *end();41};42template<>43inline constexpr bool std::ranges::enable_borrowed_range<SizedRange> = true;44 45static_assert(std::same_as<decltype(std::ranges::subrange(ForwardRange())),46 std::ranges::subrange<FI, FI, std::ranges::subrange_kind::unsized>>);47static_assert(std::same_as<decltype(std::ranges::subrange(SizedRange())),48 std::ranges::subrange<int*, int*, std::ranges::subrange_kind::sized>>);49static_assert(std::same_as<decltype(std::ranges::subrange(SizedRange(), 8)),50 std::ranges::subrange<int*, int*, std::ranges::subrange_kind::sized>>);51