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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-exception6//7//===----------------------------------------------------------------------===//8 9#ifndef _LIBCPP___CXX03___ALGORITHM_UNWRAP_RANGE_H10#define _LIBCPP___CXX03___ALGORITHM_UNWRAP_RANGE_H11 12#include <__cxx03/__algorithm/unwrap_iter.h>13#include <__cxx03/__config>14#include <__cxx03/__iterator/next.h>15#include <__cxx03/__utility/declval.h>16#include <__cxx03/__utility/move.h>17#include <__cxx03/__utility/pair.h>18 19#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)20# pragma GCC system_header21#endif22 23_LIBCPP_PUSH_MACROS24#include <__cxx03/__undef_macros>25 26_LIBCPP_BEGIN_NAMESPACE_STD27 28// __unwrap_range and __rewrap_range are used to unwrap ranges which may have different iterator and sentinel types.29// __unwrap_iter and __rewrap_iter don't work for this, because they assume that the iterator and sentinel have30// the same type. __unwrap_range tries to get two iterators and then forward to __unwrap_iter.31 32template <class _Iter, class _Unwrapped = decltype(std::__unwrap_iter(std::declval<_Iter>()))>33_LIBCPP_HIDE_FROM_ABI pair<_Unwrapped, _Unwrapped> __unwrap_range(_Iter __first, _Iter __last) {34 return std::make_pair(std::__unwrap_iter(std::move(__first)), std::__unwrap_iter(std::move(__last)));35}36 37template <class _Iter, class _Unwrapped>38_LIBCPP_HIDE_FROM_ABI _Iter __rewrap_range(_Iter __orig_iter, _Unwrapped __iter) {39 return std::__rewrap_iter(std::move(__orig_iter), std::move(__iter));40}41 42_LIBCPP_END_NAMESPACE_STD43 44_LIBCPP_POP_MACROS45 46#endif // _LIBCPP___CXX03___ALGORITHM_UNWRAP_RANGE_H47