48 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// constexpr explicit join_view(V base);12 13#include <cassert>14#include <ranges>15 16#include "test_macros.h"17#include "types.h"18 19constexpr bool test() {20 int buffer[4][4] = {{1111, 2222, 3333, 4444}, {555, 666, 777, 888}, {99, 1010, 1111, 1212}, {13, 14, 15, 16}};21 22 {23 ChildView children[4] = {ChildView(buffer[0]), ChildView(buffer[1]), ChildView(buffer[2]), ChildView(buffer[3])};24 auto jv = std::ranges::join_view(ParentView{children});25 assert(std::move(jv).base().ptr_ == children);26 }27 28 {29 std::ranges::join_view jv(buffer);30 assert(jv.base().base() == buffer + 0);31 }32 33 {34 // Test explicitness.35 static_assert( std::is_constructible_v<std::ranges::join_view<ParentView<ChildView>>, ParentView<ChildView>>);36 static_assert(!std::is_convertible_v<std::ranges::join_view<ParentView<ChildView>>, ParentView<ChildView>>);37 }38 39 return true;40}41 42int main(int, char**) {43 test();44 static_assert(test());45 46 return 0;47}48