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| 1 | // -*- C++ -*- |
|---|---|
| 2 | //===----------------------------------------------------------------------===// |
| 3 | // |
| 4 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 5 | // See https://llvm.org/LICENSE.txt for license information. |
| 6 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | |
| 10 | #ifndef _LIBCPP___CXX03___ITERATOR_PREV_H |
| 11 | #define _LIBCPP___CXX03___ITERATOR_PREV_H |
| 12 | |
| 13 | #include <__cxx03/__assert> |
| 14 | #include <__cxx03/__config> |
| 15 | #include <__cxx03/__iterator/advance.h> |
| 16 | #include <__cxx03/__iterator/iterator_traits.h> |
| 17 | #include <__cxx03/__type_traits/enable_if.h> |
| 18 | |
| 19 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 20 | # pragma GCC system_header |
| 21 | #endif |
| 22 | |
| 23 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 24 | |
| 25 | template <class _InputIter, __enable_if_t<__has_input_iterator_category<_InputIter>::value, int> = 0> |
| 26 | inline _LIBCPP_HIDE_FROM_ABI _InputIter |
| 27 | prev(_InputIter __x, typename iterator_traits<_InputIter>::difference_type __n = 1) { |
| 28 | // Calling `advance` with a negative value on a non-bidirectional iterator is a no-op in the current implementation. |
| 29 | // Note that this check duplicates the similar check in `std::advance`. |
| 30 | _LIBCPP_ASSERT_PEDANTIC(__n <= 0 || __has_bidirectional_iterator_category<_InputIter>::value, |
| 31 | "Attempt to prev(it, n) with a positive n on a non-bidirectional iterator"); |
| 32 | std::advance(__x, -__n); |
| 33 | return __x; |
| 34 | } |
| 35 | |
| 36 | _LIBCPP_END_NAMESPACE_STD |
| 37 | |
| 38 | #endif // _LIBCPP___CXX03___ITERATOR_PREV_H |
| 39 |
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