libcxx/include/__format/formatter.h

   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