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_CONSTEXPR_AFTER_CXX17 bool
25 __lexicographical_compare(_InputIterator1 __first1, _InputIterator1 __last1,
26                           _InputIterator2 __first2, _InputIterator2 __last2, _Compare __comp)
27 {
28     for (; __first2 != __last2; ++__first1, (void) ++__first2)
29     {
30         if (__first1 == __last1 || __comp(*__first1, *__first2))
31             return true;
32         if (__comp(*__first2, *__first1))
33             return false;
34     }
35     return false;
36 }
37 
38 template <class _InputIterator1, class _InputIterator2, class _Compare>
39 _LIBCPP_NODISCARD_EXT inline
40 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
41 bool
42 lexicographical_compare(_InputIterator1 __first1, _InputIterator1 __last1,
43                         _InputIterator2 __first2, _InputIterator2 __last2, _Compare __comp)
44 {
45     typedef typename __comp_ref_type<_Compare>::type _Comp_ref;
46     return _VSTD::__lexicographical_compare<_Comp_ref>(__first1, __last1, __first2, __last2, __comp);
47 }
48 
49 template <class _InputIterator1, class _InputIterator2>
50 _LIBCPP_NODISCARD_EXT inline
51 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
52 bool
53 lexicographical_compare(_InputIterator1 __first1, _InputIterator1 __last1,
54                         _InputIterator2 __first2, _InputIterator2 __last2)
55 {
56     return _VSTD::lexicographical_compare(__first1, __last1, __first2, __last2,
57                                          __less<typename iterator_traits<_InputIterator1>::value_type,
58                                                 typename iterator_traits<_InputIterator2>::value_type>());
59 }
60 
61 _LIBCPP_END_NAMESPACE_STD
62 
63 #endif // _LIBCPP___ALGORITHM_LEXICOGRAPHICAL_COMPARE_H
64