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