98 lines
3.9 KiB
C++
98 lines
3.9 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_UNWRAP_RANGE_H
|
|
#define _LIBCPP___ALGORITHM_UNWRAP_RANGE_H
|
|
|
|
#include <__algorithm/unwrap_iter.h>
|
|
#include <__concepts/constructible.h>
|
|
#include <__config>
|
|
#include <__iterator/concepts.h>
|
|
#include <__iterator/next.h>
|
|
#include <__utility/declval.h>
|
|
#include <__utility/move.h>
|
|
#include <__utility/pair.h>
|
|
|
|
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
|
|
# pragma GCC system_header
|
|
#endif
|
|
|
|
_LIBCPP_BEGIN_NAMESPACE_STD
|
|
|
|
// __unwrap_range and __rewrap_range are used to unwrap ranges which may have different iterator and sentinel types.
|
|
// __unwrap_iter and __rewrap_iter don't work for this, because they assume that the iterator and sentinel have
|
|
// the same type. __unwrap_range tries to get two iterators and then forward to __unwrap_iter.
|
|
|
|
#if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
|
|
template <class _Iter, class _Sent>
|
|
struct __unwrap_range_impl {
|
|
_LIBCPP_HIDE_FROM_ABI static constexpr auto __unwrap(_Iter __first, _Sent __sent)
|
|
requires random_access_iterator<_Iter> && sized_sentinel_for<_Sent, _Iter>
|
|
{
|
|
auto __last = ranges::next(__first, __sent);
|
|
return pair{std::__unwrap_iter(std::move(__first)), std::__unwrap_iter(std::move(__last))};
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI static constexpr auto __unwrap(_Iter __first, _Sent __last) {
|
|
return pair{std::move(__first), std::move(__last)};
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI static constexpr auto
|
|
__rewrap(_Iter __orig_iter, decltype(std::__unwrap_iter(__orig_iter)) __iter)
|
|
requires random_access_iterator<_Iter> && sized_sentinel_for<_Sent, _Iter>
|
|
{
|
|
return std::__rewrap_iter(std::move(__orig_iter), std::move(__iter));
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI static constexpr auto __rewrap(const _Iter&, _Iter __iter)
|
|
requires (!(random_access_iterator<_Iter> && sized_sentinel_for<_Sent, _Iter>))
|
|
{
|
|
return __iter;
|
|
}
|
|
};
|
|
|
|
template <class _Iter>
|
|
struct __unwrap_range_impl<_Iter, _Iter> {
|
|
_LIBCPP_HIDE_FROM_ABI static constexpr auto __unwrap(_Iter __first, _Iter __last) {
|
|
return pair{std::__unwrap_iter(std::move(__first)), std::__unwrap_iter(std::move(__last))};
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI static constexpr auto
|
|
__rewrap(_Iter __orig_iter, decltype(std::__unwrap_iter(__orig_iter)) __iter) {
|
|
return std::__rewrap_iter(std::move(__orig_iter), std::move(__iter));
|
|
}
|
|
};
|
|
|
|
template <class _Iter, class _Sent>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr auto __unwrap_range(_Iter __first, _Sent __last) {
|
|
return __unwrap_range_impl<_Iter, _Sent>::__unwrap(std::move(__first), std::move(__last));
|
|
}
|
|
|
|
template <
|
|
class _Sent,
|
|
class _Iter,
|
|
class _Unwrapped = decltype(std::__unwrap_range(std::declval<_Iter>(), std::declval<_Sent>()))>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr _Iter __rewrap_range(_Iter __orig_iter, _Unwrapped __iter) {
|
|
return __unwrap_range_impl<_Iter, _Sent>::__rewrap(std::move(__orig_iter), std::move(__iter));
|
|
}
|
|
#else // _LIBCPP_STD_VER > 17
|
|
template <class _Iter, class _Unwrapped = decltype(std::__unwrap_iter(std::declval<_Iter>()))>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR pair<_Unwrapped, _Unwrapped> __unwrap_range(_Iter __first, _Iter __last) {
|
|
return std::make_pair(std::__unwrap_iter(std::move(__first)), std::__unwrap_iter(std::move(__last)));
|
|
}
|
|
|
|
template <class _Iter, class _Unwrapped = decltype(std::__unwrap_iter(std::declval<_Iter>()))>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _Iter __rewrap_range(_Iter __orig_iter, _Unwrapped __iter) {
|
|
return std::__rewrap_iter(std::move(__orig_iter), std::move(__iter));
|
|
}
|
|
#endif // _LIBCPP_STD_VER > 17
|
|
|
|
_LIBCPP_END_NAMESPACE_STD
|
|
|
|
#endif // _LIBCPP___ALGORITHM_UNWRAP_RANGE_H
|