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-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 // UNSUPPORTED: c++03, c++11, c++14, c++17 10 // UNSUPPORTED: libcpp-no-concepts 11 // UNSUPPORTED: gcc-10 12 // UNSUPPORTED: libcpp-has-no-incomplete-ranges 13 14 // reverse_view() requires default_initializable<V> = default; 15 16 #include <ranges> 17 #include <cassert> 18 19 #include "test_macros.h" 20 #include "types.h" 21 22 enum CtorKind { DefaultCtor, PtrCtor }; 23 template<CtorKind CK> 24 struct BidirRangeWith : std::ranges::view_base { 25 int *ptr_ = nullptr; 26 27 constexpr BidirRangeWith() requires (CK == DefaultCtor) = default; 28 constexpr BidirRangeWith(int *ptr); 29 30 constexpr bidirectional_iterator<int*> begin() { return bidirectional_iterator<int*>{ptr_}; } 31 constexpr bidirectional_iterator<const int*> begin() const { return bidirectional_iterator<const int*>{ptr_}; } 32 constexpr bidirectional_iterator<int*> end() { return bidirectional_iterator<int*>{ptr_ + 8}; } 33 constexpr bidirectional_iterator<const int*> end() const { return bidirectional_iterator<const int*>{ptr_ + 8}; } 34 }; 35 36 constexpr bool test() { 37 { 38 static_assert( std::default_initializable<std::ranges::reverse_view<BidirRangeWith<DefaultCtor>>>); 39 static_assert(!std::default_initializable<std::ranges::reverse_view<BidirRangeWith<PtrCtor>>>); 40 } 41 42 { 43 std::ranges::reverse_view<BidirRangeWith<DefaultCtor>> rev; 44 assert(rev.base().ptr_ == nullptr); 45 } 46 { 47 const std::ranges::reverse_view<BidirRangeWith<DefaultCtor>> rev; 48 assert(rev.base().ptr_ == nullptr); 49 } 50 51 return true; 52 } 53 54 int main(int, char**) { 55 test(); 56 static_assert(test()); 57 58 return 0; 59 } 60 61