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___FORMAT_FORMAT_TO_N_RESULT_H
11 #define _LIBCPP___FORMAT_FORMAT_TO_N_RESULT_H
12 
13 #include <__config>
14 #include <__iterator/incrementable_traits.h>
15 
16 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
17 #  pragma GCC system_header
18 #endif
19 
20 _LIBCPP_BEGIN_NAMESPACE_STD
21 
22 #if _LIBCPP_STD_VER > 17
23 
24 // TODO FMT Remove this once we require compilers with proper C++20 support.
25 // If the compiler has no concepts support, the format header will be disabled.
26 // Without concepts support enable_if needs to be used and that too much effort
27 // to support compilers with partial C++20 support.
28 #if !defined(_LIBCPP_HAS_NO_CONCEPTS)
29 
30 template <class _OutIt>
31 struct _LIBCPP_TEMPLATE_VIS format_to_n_result {
32   _OutIt out;
33   iter_difference_t<_OutIt> size;
34 };
35 
36 #endif // !defined(_LIBCPP_HAS_NO_CONCEPTS)
37 #endif //_LIBCPP_STD_VER > 17
38 
39 _LIBCPP_END_NAMESPACE_STD
40 
41 #endif // _LIBCPP___FORMAT_FORMAT_TO_N_RESULT_H
42