xref: /freebsd/contrib/llvm-project/libcxx/include/__algorithm/lexicographical_compare.h (revision ec0ea6efa1ad229d75c394c1a9b9cac33af2b1d3)
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 <__config>
13 #include <__algorithm/comp.h>
14 #include <__algorithm/comp_ref_type.h>
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_PUSH_MACROS
22 #include <__undef_macros>
23 
24 _LIBCPP_BEGIN_NAMESPACE_STD
25 
26 template <class _Compare, class _InputIterator1, class _InputIterator2>
27 _LIBCPP_CONSTEXPR_AFTER_CXX17 bool
28 __lexicographical_compare(_InputIterator1 __first1, _InputIterator1 __last1,
29                           _InputIterator2 __first2, _InputIterator2 __last2, _Compare __comp)
30 {
31     for (; __first2 != __last2; ++__first1, (void) ++__first2)
32     {
33         if (__first1 == __last1 || __comp(*__first1, *__first2))
34             return true;
35         if (__comp(*__first2, *__first1))
36             return false;
37     }
38     return false;
39 }
40 
41 template <class _InputIterator1, class _InputIterator2, class _Compare>
42 _LIBCPP_NODISCARD_EXT inline
43 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
44 bool
45 lexicographical_compare(_InputIterator1 __first1, _InputIterator1 __last1,
46                         _InputIterator2 __first2, _InputIterator2 __last2, _Compare __comp)
47 {
48     typedef typename __comp_ref_type<_Compare>::type _Comp_ref;
49     return _VSTD::__lexicographical_compare<_Comp_ref>(__first1, __last1, __first2, __last2, __comp);
50 }
51 
52 template <class _InputIterator1, class _InputIterator2>
53 _LIBCPP_NODISCARD_EXT inline
54 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
55 bool
56 lexicographical_compare(_InputIterator1 __first1, _InputIterator1 __last1,
57                         _InputIterator2 __first2, _InputIterator2 __last2)
58 {
59     return _VSTD::lexicographical_compare(__first1, __last1, __first2, __last2,
60                                          __less<typename iterator_traits<_InputIterator1>::value_type,
61                                                 typename iterator_traits<_InputIterator2>::value_type>());
62 }
63 
64 _LIBCPP_END_NAMESPACE_STD
65 
66 _LIBCPP_POP_MACROS
67 
68 #endif // _LIBCPP___ALGORITHM_LEXICOGRAPHICAL_COMPARE_H
69