v1/__format/formatter.h

0001 // -*- C++ -*-
0002 //===----------------------------------------------------------------------===//
0003 //
0004 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0005 // See https://llvm.org/LICENSE.txt for license information.
0006 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0007 //
0008 //===----------------------------------------------------------------------===//
0009
0010 #ifndef _LIBCPP___FORMAT_FORMATTER_H
0011 #define _LIBCPP___FORMAT_FORMATTER_H
0012
0013 #include <__config>
0014 #include <__fwd/format.h>
0015
0016 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0017 #  pragma GCC system_header
0018 #endif
0019
0020 _LIBCPP_BEGIN_NAMESPACE_STD
0021
0022 #if _LIBCPP_STD_VER >= 20
0023
0024 /// The default formatter template.
0025 ///
0026 /// [format.formatter.spec]/5
0027 /// If F is a disabled specialization of formatter, these values are false:
0028 /// - is_default_constructible_v<F>,
0029 /// - is_copy_constructible_v<F>,
0030 /// - is_move_constructible_v<F>,
0031 /// - is_copy_assignable<F>, and
0032 /// - is_move_assignable<F>.
0033 template <class _Tp, class _CharT>
0034 struct _LIBCPP_TEMPLATE_VIS formatter {
0035   formatter()                            = delete;
0036   formatter(const formatter&)            = delete;
0037   formatter& operator=(const formatter&) = delete;
0038 };
0039
0040 #  if _LIBCPP_STD_VER >= 23
0041
0042 template <class _Tp>
0043 constexpr bool enable_nonlocking_formatter_optimization = false;
0044
0045 template <class _Tp>
0046 _LIBCPP_HIDE_FROM_ABI constexpr void __set_debug_format(_Tp& __formatter) {
0047   if constexpr (requires { __formatter.set_debug_format(); })
0048     __formatter.set_debug_format();
0049 }
0050
0051 #  endif // _LIBCPP_STD_VER >= 23
0052 #endif   // _LIBCPP_STD_VER >= 20
0053
0054 _LIBCPP_END_NAMESPACE_STD
0055
0056 #endif // _LIBCPP___FORMAT_FORMATTER_H