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_FORMATTER_H
11 #define _LIBCPP___FORMAT_FORMATTER_H
12 
13 #include <__availability>
14 #include <__config>
15 #include <__format/format_fwd.h>
16 
17 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
18 #  pragma GCC system_header
19 #endif
20 
21 _LIBCPP_BEGIN_NAMESPACE_STD
22 
23 #if _LIBCPP_STD_VER >= 20
24 
25 /// The default formatter template.
26 ///
27 /// [format.formatter.spec]/5
28 /// If F is a disabled specialization of formatter, these values are false:
29 /// - is_default_constructible_v<F>,
30 /// - is_copy_constructible_v<F>,
31 /// - is_move_constructible_v<F>,
32 /// - is_copy_assignable<F>, and
33 /// - is_move_assignable<F>.
34 template <class _Tp, class _CharT>
35 struct _LIBCPP_TEMPLATE_VIS formatter {
36   formatter() = delete;
37   formatter(const formatter&) = delete;
38   formatter& operator=(const formatter&) = delete;
39 };
40 
41 #  if _LIBCPP_STD_VER >= 23
42 
43 template <class _Tp>
44 _LIBCPP_HIDE_FROM_ABI constexpr void __set_debug_format(_Tp& __formatter) {
45   if constexpr (requires { __formatter.set_debug_format(); })
46     __formatter.set_debug_format();
47 }
48 
49 #  endif // _LIBCPP_STD_VER >= 23
50 #endif   // _LIBCPP_STD_VER >= 20
51 
52 _LIBCPP_END_NAMESPACE_STD
53 
54 #endif // _LIBCPP___FORMAT_FORMATTER_H
55