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___CXX03___ALGORITHM_UNWRAP_RANGE_H
10 #define _LIBCPP___CXX03___ALGORITHM_UNWRAP_RANGE_H
11
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_header
21 #endif
22
23 _LIBCPP_PUSH_MACROS
24 #include <__cxx03/__undef_macros>
25
26 _LIBCPP_BEGIN_NAMESPACE_STD
27
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 have
30 // the same type. __unwrap_range tries to get two iterators and then forward to __unwrap_iter.
31
32 template <class _Iter, class _Unwrapped = decltype(std::__unwrap_iter(std::declval<_Iter>()))>
__unwrap_range(_Iter __first,_Iter __last)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
37 template <class _Iter, class _Unwrapped>
__rewrap_range(_Iter __orig_iter,_Unwrapped __iter)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_STD
43
44 _LIBCPP_POP_MACROS
45
46 #endif // _LIBCPP___CXX03___ALGORITHM_UNWRAP_RANGE_H
47