//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
// constexpr iterator(iterator<!Const> i)
// requires Const && (convertible_to<iterator_t<Views>,
// iterator_t<maybe-const<Const, Views>>> && ...);
#include <ranges>
#include <cassert>
#include <tuple>
#include "../types.h"
using ConstIterIncompatibleView = BasicView<forward_iterator<int*>, forward_iterator<int*>,
random_access_iterator<const int*>, random_access_iterator<const int*>>;
static_assert(!std::convertible_to<std::ranges::iterator_t<ConstIterIncompatibleView>,
std::ranges::iterator_t<const ConstIterIncompatibleView>>);
constexpr bool test() {
int buffer[3] = {1, 2, 3};
{
std::ranges::zip_view v(NonSimpleCommon{buffer});
auto iter1 = v.begin();
std::ranges::iterator_t<const decltype(v)> iter2 = iter1;
assert(iter1 == iter2);
static_assert(!std::is_same_v<decltype(iter1), decltype(iter2)>);
// We cannot create a non-const iterator from a const iterator.
static_assert(!std::constructible_from<decltype(iter1), decltype(iter2)>);
}
{
// underlying non-const to const not convertible
std::ranges::zip_view v(ConstIterIncompatibleView{buffer});
auto iter1 = v.begin();
auto iter2 = std::as_const(v).begin();
static_assert(!std::is_same_v<decltype(iter1), decltype(iter2)>);
static_assert(!std::constructible_from<decltype(iter1), decltype(iter2)>);
static_assert(!std::constructible_from<decltype(iter2), decltype(iter1)>);
}
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}