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 I> 13 // struct in_found_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_found_result<A>, std::ranges::in_found_result<int>>); 26 27 struct B { 28 B(const int&); 29 B(int&&); 30 }; 31 // implicit conversion 32 static_assert(std::is_constructible_v<std::ranges::in_found_result<B>, std::ranges::in_found_result<int>>); 33 static_assert(std::is_constructible_v<std::ranges::in_found_result<B>, std::ranges::in_found_result<int>&>); 34 static_assert(std::is_constructible_v<std::ranges::in_found_result<B>, const std::ranges::in_found_result<int>>); 35 static_assert(std::is_constructible_v<std::ranges::in_found_result<B>, const std::ranges::in_found_result<int>&>); 36 37 struct C { 38 C(int&); 39 }; 40 static_assert(!std::is_constructible_v<std::ranges::in_found_result<C>, std::ranges::in_found_result<int>&>); 41 42 // has to be convertible via const& 43 static_assert(std::is_convertible_v<std::ranges::in_found_result<int>&, std::ranges::in_found_result<long>>); 44 static_assert(std::is_convertible_v<const std::ranges::in_found_result<int>&, std::ranges::in_found_result<long>>); 45 static_assert(std::is_convertible_v<std::ranges::in_found_result<int>&&, std::ranges::in_found_result<long>>); 46 static_assert(std::is_convertible_v<const std::ranges::in_found_result<int>&&, std::ranges::in_found_result<long>>); 47 48 // should be move constructible 49 static_assert(std::is_move_constructible_v<std::ranges::in_found_result<MoveOnly>>); 50 51 // should not be copy constructible 52 static_assert(!std::is_copy_constructible_v<std::ranges::in_found_result<MoveOnly>>); 53 54 struct NotConvertible {}; 55 // conversions should not work if there is no conversion 56 static_assert(!std::is_convertible_v<std::ranges::in_found_result<NotConvertible>, std::ranges::in_found_result<int>>); 57 58 static_assert(std::is_same_v<decltype(std::ranges::in_found_result<int>::in), int>); 59 static_assert(std::is_same_v<decltype(std::ranges::in_found_result<int>::found), bool>); 60 61 template <class T> 62 struct ConvertibleFrom { 63 constexpr ConvertibleFrom(T c) : content{c} {} 64 T content; 65 }; 66 67 constexpr bool test() { 68 { 69 std::ranges::in_found_result<double> res{10, true}; 70 assert(res.in == 10); 71 assert(res.found == true); 72 std::ranges::in_found_result<ConvertibleFrom<int>> res2 = res; 73 assert(res2.in.content == 10); 74 assert(res2.found == true); 75 } 76 { 77 std::ranges::in_found_result<MoveOnly> res{MoveOnly{}, false}; 78 assert(res.in.get() == 1); 79 assert(!res.found); 80 auto res2 = std::move(res); 81 assert(res2.in.get() == 1); 82 assert(!res2.found); 83 assert(res.in.get() == 0); 84 assert(!res.found); 85 } 86 auto [in, found] = std::ranges::in_found_result<int>{2, false}; 87 assert(in == 2); 88 assert(!found); 89 90 return true; 91 } 92 93 int main(int, char**) { 94 test(); 95 static_assert(test()); 96 97 return 0; 98 } 99