55 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#include <cassert>15#include <iterator>16 17#include "test_iterators.h"18#include "type_algorithms.h"19 20template <class Iterator, class Sentinel>21constexpr bool test() {22 using Subrange = std::ranges::subrange<Iterator, Sentinel>;23 24 // Empty subrange25 {26 int array[10] = {};27 Subrange rng(Iterator(std::begin(array)), Sentinel(Iterator(std::begin(array))));28 std::same_as<Iterator> decltype(auto) beg = rng.begin();29 std::same_as<Sentinel> decltype(auto) end = rng.end();30 assert(beg == Iterator(std::begin(array)));31 assert(end == Iterator(std::begin(array)));32 }33 34 // Non-empty subrange35 {36 int array[10] = {};37 Subrange rng(Iterator(std::begin(array)), Sentinel(Iterator(std::end(array) - 3)));38 std::same_as<Iterator> decltype(auto) beg = rng.begin();39 std::same_as<Sentinel> decltype(auto) end = rng.end();40 assert(beg == Iterator(std::begin(array)));41 assert(end == Iterator(std::end(array) - 3));42 }43 44 return true;45}46 47int main(int, char**) {48 types::for_each(types::forward_iterator_list<int*>{}, []<class Iterator> {49 test<Iterator, sentinel_wrapper<Iterator>>();50 static_assert(test<Iterator, sentinel_wrapper<Iterator>>());51 });52 53 return 0;54}55