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 <__config>
  14 #include <__fwd/format.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 >= 20
  23
  24 /// The default formatter template.
  25 ///
  26 /// [format.formatter.spec]/5
  27 /// If F is a disabled specialization of formatter, these values are false:
  28 /// - is_default_constructible_v<F>,
  29 /// - is_copy_constructible_v<F>,
  30 /// - is_move_constructible_v<F>,
  31 /// - is_copy_assignable<F>, and
  32 /// - is_move_assignable<F>.
  33 template <class _Tp, class _CharT>
  34 struct _LIBCPP_TEMPLATE_VIS formatter {
  35   formatter()                            = delete;
  36   formatter(const formatter&)            = delete;
  37   formatter& operator=(const formatter&) = delete;
  38 };
  39
  40 #  if _LIBCPP_STD_VER >= 23
  41
  42 template <class _Tp>
  43 constexpr bool enable_nonlocking_formatter_optimization = false;
  44
  45 template <class _Tp>
  46 _LIBCPP_HIDE_FROM_ABI constexpr void __set_debug_format(_Tp& __formatter) {
  47   if constexpr (requires { __formatter.set_debug_format(); })
  48     __formatter.set_debug_format();
  49 }
  50
  51 #  endif // _LIBCPP_STD_VER >= 23
  52 #endif   // _LIBCPP_STD_VER >= 20
  53
  54 _LIBCPP_END_NAMESPACE_STD
  55
  56 #endif // _LIBCPP___FORMAT_FORMATTER_H