1bdd1243dSDimitry Andric //===---------------------------------------------------------------------===// 2bdd1243dSDimitry Andric // 3bdd1243dSDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4bdd1243dSDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 5bdd1243dSDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6bdd1243dSDimitry Andric // 7bdd1243dSDimitry Andric //===---------------------------------------------------------------------===// 8bdd1243dSDimitry Andric 9bdd1243dSDimitry Andric #ifndef _LIBCPP___FWD_SUBRANGE_H 10bdd1243dSDimitry Andric #define _LIBCPP___FWD_SUBRANGE_H 11bdd1243dSDimitry Andric 12bdd1243dSDimitry Andric #include <__config> 13bdd1243dSDimitry Andric 14bdd1243dSDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 15bdd1243dSDimitry Andric # pragma GCC system_header 16bdd1243dSDimitry Andric #endif 17bdd1243dSDimitry Andric 18bdd1243dSDimitry Andric #if _LIBCPP_STD_VER >= 20 19bdd1243dSDimitry Andric 20bdd1243dSDimitry Andric #include <__iterator/concepts.h> 21bdd1243dSDimitry Andric 22bdd1243dSDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 23bdd1243dSDimitry Andric 24bdd1243dSDimitry Andric namespace ranges { 25bdd1243dSDimitry Andric 26*5f757f3fSDimitry Andric enum class subrange_kind : bool { unsized, sized }; 27bdd1243dSDimitry Andric 28bdd1243dSDimitry Andric template <input_or_output_iterator _Iter, sentinel_for<_Iter> _Sent, subrange_kind _Kind> 29bdd1243dSDimitry Andric requires(_Kind == subrange_kind::sized || !sized_sentinel_for<_Sent, _Iter>) 30bdd1243dSDimitry Andric class _LIBCPP_TEMPLATE_VIS subrange; 31bdd1243dSDimitry Andric 32bdd1243dSDimitry Andric } // namespace ranges 33bdd1243dSDimitry Andric 34bdd1243dSDimitry Andric _LIBCPP_END_NAMESPACE_STD 35bdd1243dSDimitry Andric 36bdd1243dSDimitry Andric #endif // _LIBCPP_STD_VER >= 20 37bdd1243dSDimitry Andric 38bdd1243dSDimitry Andric #endif // _LIBCPP___FWD_SUBRANGE_H 39