1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 #ifndef _LIBCPP___ALGORITHM_LEXICOGRAPHICAL_COMPARE_H
10 #define _LIBCPP___ALGORITHM_LEXICOGRAPHICAL_COMPARE_H
11
12 #include <__algorithm/comp.h>
13 #include <__algorithm/comp_ref_type.h>
14 #include <__config>
15 #include <__iterator/iterator_traits.h>
16
17 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
18 # pragma GCC system_header
19 #endif
20
21 _LIBCPP_BEGIN_NAMESPACE_STD
22
23 template <class _Compare, class _InputIterator1, class _InputIterator2>
__lexicographical_compare(_InputIterator1 __first1,_InputIterator1 __last1,_InputIterator2 __first2,_InputIterator2 __last2,_Compare __comp)24 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool __lexicographical_compare(
25 _InputIterator1 __first1,
26 _InputIterator1 __last1,
27 _InputIterator2 __first2,
28 _InputIterator2 __last2,
29 _Compare __comp) {
30 for (; __first2 != __last2; ++__first1, (void)++__first2) {
31 if (__first1 == __last1 || __comp(*__first1, *__first2))
32 return true;
33 if (__comp(*__first2, *__first1))
34 return false;
35 }
36 return false;
37 }
38
39 template <class _InputIterator1, class _InputIterator2, class _Compare>
lexicographical_compare(_InputIterator1 __first1,_InputIterator1 __last1,_InputIterator2 __first2,_InputIterator2 __last2,_Compare __comp)40 _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool lexicographical_compare(
41 _InputIterator1 __first1,
42 _InputIterator1 __last1,
43 _InputIterator2 __first2,
44 _InputIterator2 __last2,
45 _Compare __comp) {
46 return std::__lexicographical_compare<__comp_ref_type<_Compare> >(__first1, __last1, __first2, __last2, __comp);
47 }
48
49 template <class _InputIterator1, class _InputIterator2>
lexicographical_compare(_InputIterator1 __first1,_InputIterator1 __last1,_InputIterator2 __first2,_InputIterator2 __last2)50 _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool lexicographical_compare(
51 _InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _InputIterator2 __last2) {
52 return std::lexicographical_compare(__first1, __last1, __first2, __last2, __less<>());
53 }
54
55 _LIBCPP_END_NAMESPACE_STD
56
57 #endif // _LIBCPP___ALGORITHM_LEXICOGRAPHICAL_COMPARE_H
58