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-has-no-incomplete-ranges 11 12 // template <class I1, class I2> 13 // struct in_in_result; 14 15 #include <algorithm> 16 #include <cassert> 17 #include <type_traits> 18 19 #include "MoveOnly.h" 20 21 struct A { 22 explicit A(int); 23 }; 24 // no implicit conversion 25 static_assert(!std::is_constructible_v<std::ranges::in_in_result<A, A>, std::ranges::in_in_result<int, int>>); 26 27 struct B { 28 B(int); 29 }; 30 // implicit conversion 31 static_assert(std::is_constructible_v<std::ranges::in_in_result<B, B>, std::ranges::in_in_result<int, int>>); 32 static_assert(std::is_constructible_v<std::ranges::in_in_result<B, B>, std::ranges::in_in_result<int, int>&>); 33 static_assert(std::is_constructible_v<std::ranges::in_in_result<B, B>, const std::ranges::in_in_result<int, int>>); 34 static_assert(std::is_constructible_v<std::ranges::in_in_result<B, B>, const std::ranges::in_in_result<int, int>&>); 35 36 struct C { 37 C(int&); 38 }; 39 static_assert(!std::is_constructible_v<std::ranges::in_in_result<C, C>, std::ranges::in_in_result<int, int>&>); 40 41 // has to be convertible via const& 42 static_assert(std::is_convertible_v<std::ranges::in_in_result<int, int>&, std::ranges::in_in_result<long, long>>); 43 static_assert(std::is_convertible_v<const std::ranges::in_in_result<int, int>&, std::ranges::in_in_result<long, long>>); 44 static_assert(std::is_convertible_v<std::ranges::in_in_result<int, int>&&, std::ranges::in_in_result<long, long>>); 45 static_assert(std::is_convertible_v<const std::ranges::in_in_result<int, int>&&, std::ranges::in_in_result<long, long>>); 46 47 // should be move constructible 48 static_assert(std::is_move_constructible_v<std::ranges::in_in_result<MoveOnly, int>>); 49 static_assert(std::is_move_constructible_v<std::ranges::in_in_result<int, MoveOnly>>); 50 51 struct NotConvertible {}; 52 // conversions should not work if there is no conversion 53 static_assert(!std::is_convertible_v<std::ranges::in_in_result<NotConvertible, int>, std::ranges::in_in_result<int, int>>); 54 static_assert(!std::is_convertible_v<std::ranges::in_in_result<int, NotConvertible>, std::ranges::in_in_result<int, int>>); 55 56 template <class T> 57 struct ConstructibleFrom { 58 constexpr ConstructibleFrom(T c) : content{c} {} 59 T content; 60 }; 61 62 constexpr bool test() { 63 { 64 std::ranges::in_in_result<int, double> res{10L, 0.}; 65 assert(res.in1 == 10); 66 assert(res.in2 == 0.); 67 std::ranges::in_in_result<ConstructibleFrom<int>, ConstructibleFrom<double>> res2 = res; 68 assert(res2.in1.content == 10); 69 assert(res2.in2.content == 0.); 70 } 71 { 72 std::ranges::in_in_result<MoveOnly, int> res{MoveOnly{}, 0}; 73 assert(res.in1.get() == 1); 74 [[maybe_unused]] auto res2 = static_cast<std::ranges::in_in_result<MoveOnly, int>>(std::move(res)); 75 assert(res.in1.get() == 0); 76 } 77 { 78 auto [in1, in2] = std::ranges::in_in_result<int, int>{1, 2}; 79 assert(in1 == 1); 80 assert(in2 == 2); 81 } 82 83 return true; 84 } 85 86 int main(int, char**) { 87 test(); 88 static_assert(test()); 89 90 return 0; 91 } 92