57 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8 9// check that std::__unwrap_iter() returns the correct type10 11#include <algorithm>12#include <cassert>13#include <string>14#include <type_traits>15 16#include "test_iterators.h"17#include "test_macros.h"18 19template <class Iter>20using UnwrapT = decltype(std::__unwrap_iter(std::declval<Iter>()));21 22template <class Iter>23using rev_iter = std::reverse_iterator<Iter>;24 25template <class Iter>26using rev_rev_iter = rev_iter<rev_iter<Iter> >;27 28static_assert(std::is_same<UnwrapT<int*>, int*>::value, "");29static_assert(std::is_same<UnwrapT<std::__wrap_iter<int*> >, int*>::value, "");30static_assert(std::is_same<UnwrapT<rev_iter<int*> >, std::reverse_iterator<int*> >::value, "");31static_assert(std::is_same<UnwrapT<rev_rev_iter<int*> >, int*>::value, "");32static_assert(std::is_same<UnwrapT<rev_rev_iter<std::__wrap_iter<int*> > >, int*>::value, "");33static_assert(std::is_same<UnwrapT<rev_rev_iter<rev_iter<std::__wrap_iter<int*> > > >, rev_iter<std::__wrap_iter<int*> > >::value, "");34 35static_assert(std::is_same<UnwrapT<random_access_iterator<int*> >, random_access_iterator<int*> >::value, "");36static_assert(std::is_same<UnwrapT<rev_iter<random_access_iterator<int*> > >, rev_iter<random_access_iterator<int*> > >::value, "");37static_assert(std::is_same<UnwrapT<rev_rev_iter<random_access_iterator<int*> > >, random_access_iterator<int*> >::value, "");38static_assert(std::is_same<UnwrapT<rev_rev_iter<rev_iter<random_access_iterator<int*> > > >, rev_iter<random_access_iterator<int*> > >::value, "");39 40TEST_CONSTEXPR_CXX20 bool test() {41 std::string str = "Banane";42 using Iter = std::string::iterator;43 44 assert(std::__unwrap_iter(str.begin()) == str.data());45 assert(std::__unwrap_iter(str.end()) == str.data() + str.size());46 assert(std::__unwrap_iter(rev_rev_iter<Iter>(rev_iter<Iter>(str.begin()))) == str.data());47 assert(std::__unwrap_iter(rev_rev_iter<Iter>(rev_iter<Iter>(str.end()))) == str.data() + str.size());48 49 return true;50}51 52int main(int, char**) {53 test();54 55 return 0;56}57