33 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// template<class T, size_t N>12// inline constexpr bool enable_borrowed_range<elements_view<T, N>> =13// enable_borrowed_range<T>;14 15#include <ranges>16#include <tuple>17 18struct NonBorrowed : std::ranges::view_base {19 std::tuple<int>* begin();20 std::tuple<int>* end();21};22 23struct Borrowed : std::ranges::view_base {24 std::tuple<int>* begin();25 std::tuple<int>* end();26};27 28template <>29inline constexpr bool std::ranges::enable_borrowed_range<Borrowed> = true;30 31static_assert(!std::ranges::borrowed_range<std::ranges::elements_view<NonBorrowed, 0>>);32static_assert(std::ranges::borrowed_range<std::ranges::elements_view<Borrowed, 0>>);33