| 1 | //===----------------------------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | // <iterator> |
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| 10 | |
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| 11 | // reverse_iterator |
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| 12 | |
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| 13 | // requires RandomAccessIterator<Iter> |
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| 14 | // reverse_iterator operator-(difference_type n) const; // constexpr in C++17 |
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| 15 | |
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| 16 | #include <iterator> |
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| 17 | #include <cassert> |
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| 18 | |
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| 19 | #include "test_macros.h" |
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| 20 | #include "test_iterators.h" |
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| 21 | |
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| 22 | template <class It> |
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| 23 | TEST_CONSTEXPR_CXX17 void test(It i, typename std::iterator_traits<It>::difference_type n, It x) { |
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| 24 | const std::reverse_iterator<It> r(i); |
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| 25 | std::reverse_iterator<It> rr = r - n; |
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| 26 | assert(rr.base() == x); |
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| 27 | } |
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| 28 | |
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| 29 | TEST_CONSTEXPR_CXX17 bool tests() { |
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| 30 | const char* s = "1234567890" ; |
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| 31 | test(random_access_iterator<const char*>(s+5), 5, random_access_iterator<const char*>(s+10)); |
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| 32 | test(s+5, 5, s+10); |
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| 33 | return true; |
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| 34 | } |
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| 35 | |
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| 36 | int main(int, char**) { |
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| 37 | tests(); |
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| 38 | #if TEST_STD_VER > 14 |
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| 39 | static_assert(tests(), "" ); |
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| 40 | #endif |
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| 41 | return 0; |
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| 42 | } |
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| 43 | |
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