derek.holloway
7502bf64a4
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57 lines
2.3 KiB
C++
57 lines
2.3 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// check that std::__unwrap_iter() returns the correct type
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#include <algorithm>
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#include <cassert>
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#include <string>
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#include <type_traits>
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#include "test_iterators.h"
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#include "test_macros.h"
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template <class Iter>
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using UnwrapT = decltype(std::__unwrap_iter(std::declval<Iter>()));
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template <class Iter>
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using rev_iter = std::reverse_iterator<Iter>;
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template <class Iter>
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using rev_rev_iter = rev_iter<rev_iter<Iter> >;
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static_assert(std::is_same<UnwrapT<int*>, int*>::value, "");
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static_assert(std::is_same<UnwrapT<std::__wrap_iter<int*> >, int*>::value, "");
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static_assert(std::is_same<UnwrapT<rev_iter<int*> >, std::reverse_iterator<int*> >::value, "");
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static_assert(std::is_same<UnwrapT<rev_rev_iter<int*> >, int*>::value, "");
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static_assert(std::is_same<UnwrapT<rev_rev_iter<std::__wrap_iter<int*> > >, int*>::value, "");
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static_assert(std::is_same<UnwrapT<rev_rev_iter<rev_iter<std::__wrap_iter<int*> > > >, rev_iter<std::__wrap_iter<int*> > >::value, "");
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static_assert(std::is_same<UnwrapT<random_access_iterator<int*> >, random_access_iterator<int*> >::value, "");
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static_assert(std::is_same<UnwrapT<rev_iter<random_access_iterator<int*> > >, rev_iter<random_access_iterator<int*> > >::value, "");
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static_assert(std::is_same<UnwrapT<rev_rev_iter<random_access_iterator<int*> > >, random_access_iterator<int*> >::value, "");
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static_assert(std::is_same<UnwrapT<rev_rev_iter<rev_iter<random_access_iterator<int*> > > >, rev_iter<random_access_iterator<int*> > >::value, "");
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TEST_CONSTEXPR_CXX20 bool test() {
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std::string str = "Banane";
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using Iter = std::string::iterator;
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assert(std::__unwrap_iter(str.begin()) == str.data());
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assert(std::__unwrap_iter(str.end()) == str.data() + str.size());
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assert(std::__unwrap_iter(rev_rev_iter<Iter>(rev_iter<Iter>(str.begin()))) == str.data());
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assert(std::__unwrap_iter(rev_rev_iter<Iter>(rev_iter<Iter>(str.end()))) == str.data() + str.size());
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return true;
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}
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int main(int, char**) {
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test();
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return 0;
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}
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