1 // -*- C++ -*-
2 //===---------------------------------------------------------------------===//
3 //
4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5 // See https://llvm.org/LICENSE.txt for license information.
6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //
8 //===---------------------------------------------------------------------===//
9 
10 #ifndef _LIBCPP___FWD_SPAN_H
11 #define _LIBCPP___FWD_SPAN_H
12 
13 #include <__config>
14 #include <cstddef>
15 #include <limits>
16 
17 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
18 #  pragma GCC system_header
19 #endif
20 
21 _LIBCPP_PUSH_MACROS
22 #include <__undef_macros>
23 
24 _LIBCPP_BEGIN_NAMESPACE_STD
25 
26 #if _LIBCPP_STD_VER >= 20
27 
28 inline constexpr size_t dynamic_extent = numeric_limits<size_t>::max();
29 template <typename _Tp, size_t _Extent = dynamic_extent> class span;
30 
31 #endif
32 
33 _LIBCPP_END_NAMESPACE_STD
34 
35 _LIBCPP_POP_MACROS
36 
37 #endif // _LIBCPP___FWD_SPAN_H
38