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
11// <iterator>
12
13// move_sentinel
14
15// template<class S2>
16// requires assignable_from<S&, const S2&>
17// constexpr move_sentinel& operator=(const move_sentinel<S2>& s);
18
19#include <cassert>
20#include <concepts>
21#include <iterator>
22#include <type_traits>
23
24struct NonAssignable {
25 NonAssignable& operator=(int i);
26};
27static_assert(std::semiregular<NonAssignable>);
28static_assert(std::is_assignable_v<NonAssignable, int>);
29static_assert(!std::assignable_from<NonAssignable, int>);
30
31constexpr bool test()
32{
33 // Assigning from an lvalue.
34 {
35 std::move_sentinel<int> m(42);
36 std::move_sentinel<long> m2;
37 m2 = m;
38 assert(m2.base() == 42L);
39 }
40
41 // Assigning from an rvalue.
42 {
43 std::move_sentinel<long> m2;
44 m2 = std::move_sentinel<int>(43);
45 assert(m2.base() == 43L);
46 }
47
48 // SFINAE checks.
49 {
50 static_assert( std::is_assignable_v<std::move_sentinel<int>, std::move_sentinel<long>>);
51 static_assert(!std::is_assignable_v<std::move_sentinel<int*>, std::move_sentinel<const int*>>);
52 static_assert( std::is_assignable_v<std::move_sentinel<const int*>, std::move_sentinel<int*>>);
53 static_assert(!std::is_assignable_v<std::move_sentinel<NonAssignable>, std::move_sentinel<int>>);
54 }
55 return true;
56}
57
58int main(int, char**)
59{
60 test();
61 static_assert(test());
62
63 return 0;
64}
65

source code of libcxx/test/std/iterators/predef.iterators/move.iterators/move.sentinel/assign.converting.pass.cpp