| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <iterator> |
| |
| // move_iterator |
| |
| // template <class U> |
| // requires HasAssign<Iter, const U&> |
| // move_iterator& |
| // operator=(const move_iterator<U>& u); |
| // |
| // constexpr in C++17 |
| |
| #include <iterator> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| #include "test_iterators.h" |
| |
| template <class It, class U> |
| void |
| test(U u) |
| { |
| const std::move_iterator<U> r2(u); |
| std::move_iterator<It> r1; |
| std::move_iterator<It>& rr = (r1 = r2); |
| assert(r1.base() == u); |
| assert(&rr == &r1); |
| } |
| |
| struct Base {}; |
| struct Derived : Base {}; |
| |
| struct ToIter { |
| typedef std::forward_iterator_tag iterator_category; |
| typedef char *pointer; |
| typedef char &reference; |
| typedef char value_type; |
| typedef value_type difference_type; |
| |
| explicit TEST_CONSTEXPR_CXX17 ToIter() : m_value(0) {} |
| TEST_CONSTEXPR_CXX17 ToIter(const ToIter &src) : m_value(src.m_value) {} |
| // Intentionally not defined, must not be called. |
| ToIter(char *src); |
| TEST_CONSTEXPR_CXX17 ToIter &operator=(char *src) { |
| m_value = src; |
| return *this; |
| } |
| TEST_CONSTEXPR_CXX17 ToIter &operator=(const ToIter &src) { |
| m_value = src.m_value; |
| return *this; |
| } |
| char *m_value; |
| }; |
| |
| TEST_CONSTEXPR_CXX17 bool test_conv_assign() |
| { |
| char c = '\0'; |
| char *fi = &c; |
| const std::move_iterator<char *> move_fi(fi); |
| std::move_iterator<ToIter> move_ti; |
| move_ti = move_fi; |
| assert(move_ti.base().m_value == fi); |
| return true; |
| } |
| |
| int main(int, char**) |
| { |
| Derived d; |
| |
| test<cpp17_input_iterator<Base*> >(cpp17_input_iterator<Derived*>(&d)); |
| test<forward_iterator<Base*> >(forward_iterator<Derived*>(&d)); |
| test<bidirectional_iterator<Base*> >(bidirectional_iterator<Derived*>(&d)); |
| test<random_access_iterator<const Base*> >(random_access_iterator<Derived*>(&d)); |
| test<Base*>(&d); |
| test_conv_assign(); |
| #if TEST_STD_VER > 14 |
| { |
| using BaseIter = std::move_iterator<const Base *>; |
| using DerivedIter = std::move_iterator<const Derived *>; |
| constexpr const Derived *p = nullptr; |
| constexpr DerivedIter it1 = std::make_move_iterator(p); |
| constexpr BaseIter it2 = (BaseIter{nullptr} = it1); |
| static_assert(it2.base() == p, ""); |
| static_assert(test_conv_assign(), ""); |
| } |
| #endif |
| |
| return 0; |
| } |