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>
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>
40 _LIBCPP_NODISCARD_EXT 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>
50 _LIBCPP_NODISCARD_EXT 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