libcxx/include/__algorithm/lexicographical_compare.h

   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
  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_SINCE_CXX20
  41 bool
  42 lexicographical_compare(_InputIterator1 __first1, _InputIterator1 __last1,
  43                         _InputIterator2 __first2, _InputIterator2 __last2, _Compare __comp)
  44 {
  45     return _VSTD::__lexicographical_compare<__comp_ref_type<_Compare> >(__first1, __last1, __first2, __last2, __comp);
  46 }
  47
  48 template <class _InputIterator1, class _InputIterator2>
  49 _LIBCPP_NODISCARD_EXT inline
  50 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
  51 bool
  52 lexicographical_compare(_InputIterator1 __first1, _InputIterator1 __last1,
  53                         _InputIterator2 __first2, _InputIterator2 __last2)
  54 {
  55     return _VSTD::lexicographical_compare(__first1, __last1, __first2, __last2, __less<>());
  56 }
  57
  58 _LIBCPP_END_NAMESPACE_STD
  59
  60 #endif // _LIBCPP___ALGORITHM_LEXICOGRAPHICAL_COMPARE_H