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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_ADVANCE_H |
| 11 | #define _LIBCPP___CXX03___ITERATOR_ADVANCE_H |
| 12 | |
| 13 | #include <__cxx03/__assert> |
| 14 | #include <__cxx03/__config> |
| 15 | #include <__cxx03/__iterator/iterator_traits.h> |
| 16 | #include <__cxx03/__type_traits/enable_if.h> |
| 17 | #include <__cxx03/__type_traits/is_integral.h> |
| 18 | #include <__cxx03/__utility/convert_to_integral.h> |
| 19 | #include <__cxx03/__utility/declval.h> |
| 20 | #include <__cxx03/__utility/move.h> |
| 21 | #include <__cxx03/__utility/unreachable.h> |
| 22 | #include <__cxx03/limits> |
| 23 | |
| 24 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 25 | # pragma GCC system_header |
| 26 | #endif |
| 27 | |
| 28 | _LIBCPP_PUSH_MACROS |
| 29 | #include <__cxx03/__undef_macros> |
| 30 | |
| 31 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 32 | |
| 33 | template <class _InputIter> |
| 34 | _LIBCPP_HIDE_FROM_ABI void |
| 35 | __advance(_InputIter& __i, typename iterator_traits<_InputIter>::difference_type __n, input_iterator_tag) { |
| 36 | for (; __n > 0; --__n) |
| 37 | ++__i; |
| 38 | } |
| 39 | |
| 40 | template <class _BiDirIter> |
| 41 | _LIBCPP_HIDE_FROM_ABI void |
| 42 | __advance(_BiDirIter& __i, typename iterator_traits<_BiDirIter>::difference_type __n, bidirectional_iterator_tag) { |
| 43 | if (__n >= 0) |
| 44 | for (; __n > 0; --__n) |
| 45 | ++__i; |
| 46 | else |
| 47 | for (; __n < 0; ++__n) |
| 48 | --__i; |
| 49 | } |
| 50 | |
| 51 | template <class _RandIter> |
| 52 | _LIBCPP_HIDE_FROM_ABI void |
| 53 | __advance(_RandIter& __i, typename iterator_traits<_RandIter>::difference_type __n, random_access_iterator_tag) { |
| 54 | __i += __n; |
| 55 | } |
| 56 | |
| 57 | template < class _InputIter, |
| 58 | class _Distance, |
| 59 | class _IntegralDistance = decltype(std::__convert_to_integral(std::declval<_Distance>())), |
| 60 | __enable_if_t<is_integral<_IntegralDistance>::value, int> = 0> |
| 61 | _LIBCPP_HIDE_FROM_ABI void advance(_InputIter& __i, _Distance __orig_n) { |
| 62 | typedef typename iterator_traits<_InputIter>::difference_type _Difference; |
| 63 | _Difference __n = static_cast<_Difference>(std::__convert_to_integral(__orig_n)); |
| 64 | // Calling `advance` with a negative value on a non-bidirectional iterator is a no-op in the current implementation. |
| 65 | _LIBCPP_ASSERT_PEDANTIC(__n >= 0 || __has_bidirectional_iterator_category<_InputIter>::value, |
| 66 | "Attempt to advance(it, n) with negative n on a non-bidirectional iterator"); |
| 67 | std::__advance(__i, __n, typename iterator_traits<_InputIter>::iterator_category()); |
| 68 | } |
| 69 | |
| 70 | _LIBCPP_END_NAMESPACE_STD |
| 71 | |
| 72 | _LIBCPP_POP_MACROS |
| 73 | |
| 74 | #endif // _LIBCPP___CXX03___ITERATOR_ADVANCE_H |
| 75 |
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