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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_DISTANCE_H
11#define _LIBCPP___CXX03___ITERATOR_DISTANCE_H
12
13#include <__cxx03/__config>
14#include <__cxx03/__iterator/iterator_traits.h>
15#include <__cxx03/__type_traits/decay.h>
16#include <__cxx03/__type_traits/remove_cvref.h>
17
18#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
19# pragma GCC system_header
20#endif
21
22_LIBCPP_BEGIN_NAMESPACE_STD
23
24template <class _InputIter>
25inline _LIBCPP_HIDE_FROM_ABI typename iterator_traits<_InputIter>::difference_type
26__distance(_InputIter __first, _InputIter __last, input_iterator_tag) {
27 typename iterator_traits<_InputIter>::difference_type __r(0);
28 for (; __first != __last; ++__first)
29 ++__r;
30 return __r;
31}
32
33template <class _RandIter>
34inline _LIBCPP_HIDE_FROM_ABI typename iterator_traits<_RandIter>::difference_type
35__distance(_RandIter __first, _RandIter __last, random_access_iterator_tag) {
36 return __last - __first;
37}
38
39template <class _InputIter>
40inline _LIBCPP_HIDE_FROM_ABI typename iterator_traits<_InputIter>::difference_type
41distance(_InputIter __first, _InputIter __last) {
42 return std::__distance(__first, __last, typename iterator_traits<_InputIter>::iterator_category());
43}
44
45_LIBCPP_END_NAMESPACE_STD
46
47#endif // _LIBCPP___CXX03___ITERATOR_DISTANCE_H
48

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source code of libcxx/include/__cxx03/__iterator/distance.h