libcxx/include/__cxx03/__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 <__cxx03/__algorithm/comp.h>
  13 #include <__cxx03/__algorithm/comp_ref_type.h>
  14 #include <__cxx03/__config>
  15 #include <__cxx03/__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 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 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