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_fun_result; 14 15 #include <algorithm> 16 #include <cassert> 17 #include <type_traits> 18 #include <utility> 19 20 #include "MoveOnly.h" 21 22 struct A { 23 explicit A(int); 24 }; 25 // no implicit conversion 26 static_assert(!std::is_constructible_v<std::ranges::in_fun_result<A, A>, std::ranges::in_fun_result<int, int>>); 27 28 struct B { 29 B(int); 30 }; 31 // implicit conversion 32 static_assert(std::is_constructible_v<std::ranges::in_fun_result<B, B>, std::ranges::in_fun_result<int, int>>); 33 static_assert(std::is_constructible_v<std::ranges::in_fun_result<B, B>, std::ranges::in_fun_result<int, int>&>); 34 static_assert(std::is_constructible_v<std::ranges::in_fun_result<B, B>, const std::ranges::in_fun_result<int, int>>); 35 static_assert(std::is_constructible_v<std::ranges::in_fun_result<B, B>, const std::ranges::in_fun_result<int, int>&>); 36 37 struct C { 38 C(int&); 39 }; 40 // has to be convertible via const& 41 static_assert(!std::is_constructible_v<std::ranges::in_fun_result<C, C>, std::ranges::in_fun_result<int, int>&>); 42 43 static_assert(std::is_convertible_v<std::ranges::in_fun_result<int, int>&, std::ranges::in_fun_result<long, long>>); 44 static_assert(std::is_convertible_v<const std::ranges::in_fun_result<int, int>&, std::ranges::in_fun_result<long, long>>); 45 static_assert(std::is_convertible_v<std::ranges::in_fun_result<int, int>&&, std::ranges::in_fun_result<long, long>>); 46 static_assert(std::is_convertible_v<const std::ranges::in_fun_result<int, int>&&, std::ranges::in_fun_result<long, long>>); 47 48 // should be move constructible 49 static_assert(std::is_move_constructible_v<std::ranges::in_fun_result<MoveOnly, int>>); 50 static_assert(std::is_move_constructible_v<std::ranges::in_fun_result<int, MoveOnly>>); 51 52 // should not copy constructible with move-only type 53 static_assert(!std::is_copy_constructible_v<std::ranges::in_fun_result<MoveOnly, int>>); 54 static_assert(!std::is_copy_constructible_v<std::ranges::in_fun_result<int, MoveOnly>>); 55 56 struct NotConvertible {}; 57 // conversions should not work if there is no conversion 58 static_assert(!std::is_convertible_v<std::ranges::in_fun_result<NotConvertible, int>, 59 std::ranges::in_fun_result<int, int>>); 60 static_assert(!std::is_convertible_v<std::ranges::in_fun_result<int, NotConvertible>, 61 std::ranges::in_fun_result<int, int>>); 62 63 template <class T> 64 struct ConvertibleFrom { 65 constexpr ConvertibleFrom(T c) : content{c} {} 66 T content; 67 }; 68 69 constexpr bool test() { 70 { 71 std::ranges::in_fun_result<int, double> res{10, 0.}; 72 assert(res.in == 10); 73 assert(res.fun == 0.); 74 std::ranges::in_fun_result<ConvertibleFrom<int>, ConvertibleFrom<double>> res2 = res; 75 assert(res2.in.content == 10); 76 assert(res2.fun.content == 0.); 77 } 78 { 79 std::ranges::in_fun_result<MoveOnly, int> res{MoveOnly{}, 2}; 80 assert(res.in.get() == 1); 81 assert(res.fun == 2); 82 auto res2 = static_cast<std::ranges::in_fun_result<MoveOnly, int>>(std::move(res)); 83 assert(res.in.get() == 0); 84 assert(res2.in.get() == 1); 85 assert(res2.fun == 2); 86 } 87 { 88 auto [in, fun] = std::ranges::in_fun_result<int, int>{1, 2}; 89 assert(in == 1); 90 assert(fun == 2); 91 } 92 return true; 93 } 94 95 int main(int, char**) { 96 test(); 97 static_assert(test()); 98 99 return 0; 100 } 101