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//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// check that std::__unwrap_iter() returns the correct type
#include <algorithm>
#include <cassert>
#include <string>
#include <type_traits>
#include "test_iterators.h"
#include "test_macros.h"
template <class Iter>
using UnwrapT = decltype(std::__unwrap_iter(std::declval<Iter>()));
template <class Iter>
using rev_iter = std::reverse_iterator<Iter>;
template <class Iter>
using rev_rev_iter = rev_iter<rev_iter<Iter> >;
static_assert(std::is_same<UnwrapT<int*>, int*>::value, "");
static_assert(std::is_same<UnwrapT<std::__wrap_iter<int*> >, int*>::value, "");
static_assert(std::is_same<UnwrapT<rev_iter<int*> >, std::reverse_iterator<int*> >::value, "");
static_assert(std::is_same<UnwrapT<rev_rev_iter<int*> >, int*>::value, "");
static_assert(std::is_same<UnwrapT<rev_rev_iter<std::__wrap_iter<int*> > >, int*>::value, "");
static_assert(std::is_same<UnwrapT<rev_rev_iter<rev_iter<std::__wrap_iter<int*> > > >, rev_iter<std::__wrap_iter<int*> > >::value, "");
static_assert(std::is_same<UnwrapT<random_access_iterator<int*> >, random_access_iterator<int*> >::value, "");
static_assert(std::is_same<UnwrapT<rev_iter<random_access_iterator<int*> > >, rev_iter<random_access_iterator<int*> > >::value, "");
static_assert(std::is_same<UnwrapT<rev_rev_iter<random_access_iterator<int*> > >, random_access_iterator<int*> >::value, "");
static_assert(std::is_same<UnwrapT<rev_rev_iter<rev_iter<random_access_iterator<int*> > > >, rev_iter<random_access_iterator<int*> > >::value, "");
TEST_CONSTEXPR_CXX20 bool test() {
std::string str = "Banane";
using Iter = std::string::iterator;
assert(std::__unwrap_iter(str.begin()) == str.data());
assert(std::__unwrap_iter(str.end()) == str.data() + str.size());
assert(std::__unwrap_iter(rev_rev_iter<Iter>(rev_iter<Iter>(str.begin()))) == str.data());
assert(std::__unwrap_iter(rev_rev_iter<Iter>(rev_iter<Iter>(str.end()))) == str.data() + str.size());
return true;
}
int main(int, char**) {
test();
#if TEST_STD_VER > 17
static_assert(test());
#endif
return 0;
}
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