49 lines
1.5 KiB
C++
49 lines
1.5 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef _LIBCPP___ALGORITHM_PARTITION_POINT_H
|
|
#define _LIBCPP___ALGORITHM_PARTITION_POINT_H
|
|
|
|
#include <__algorithm/half_positive.h>
|
|
#include <__config>
|
|
#include <__iterator/advance.h>
|
|
#include <__iterator/distance.h>
|
|
#include <__iterator/iterator_traits.h>
|
|
|
|
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
|
|
# pragma GCC system_header
|
|
#endif
|
|
|
|
_LIBCPP_BEGIN_NAMESPACE_STD
|
|
|
|
template<class _ForwardIterator, class _Predicate>
|
|
_LIBCPP_CONSTEXPR_AFTER_CXX17 _ForwardIterator
|
|
partition_point(_ForwardIterator __first, _ForwardIterator __last, _Predicate __pred)
|
|
{
|
|
typedef typename iterator_traits<_ForwardIterator>::difference_type difference_type;
|
|
difference_type __len = _VSTD::distance(__first, __last);
|
|
while (__len != 0)
|
|
{
|
|
difference_type __l2 = _VSTD::__half_positive(__len);
|
|
_ForwardIterator __m = __first;
|
|
_VSTD::advance(__m, __l2);
|
|
if (__pred(*__m))
|
|
{
|
|
__first = ++__m;
|
|
__len -= __l2 + 1;
|
|
}
|
|
else
|
|
__len = __l2;
|
|
}
|
|
return __first;
|
|
}
|
|
|
|
_LIBCPP_END_NAMESPACE_STD
|
|
|
|
#endif // _LIBCPP___ALGORITHM_PARTITION_POINT_H
|