libcxx/include/__format/formatter_bool.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_BOOL_H
  11 #define _LIBCPP___FORMAT_FORMATTER_BOOL_H
  12
  13 #include <__algorithm/copy.h>
  14 #include <__assert>
  15 #include <__availability>
  16 #include <__config>
  17 #include <__format/concepts.h>
  18 #include <__format/format_parse_context.h>
  19 #include <__format/formatter.h>
  20 #include <__format/formatter_integral.h>
  21 #include <__format/parser_std_format_spec.h>
  22 #include <__utility/unreachable.h>
  23
  24 #ifndef _LIBCPP_HAS_NO_LOCALIZATION
  25 #  include <locale>
  26 #endif
  27
  28 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  29 #  pragma GCC system_header
  30 #endif
  31
  32 _LIBCPP_BEGIN_NAMESPACE_STD
  33
  34 #if _LIBCPP_STD_VER >= 20
  35
  36 template <__fmt_char_type _CharT>
  37 struct _LIBCPP_TEMPLATE_VIS formatter<bool, _CharT> {
  38 public:
  39   template <class _ParseContext>
  40   _LIBCPP_HIDE_FROM_ABI constexpr typename _ParseContext::iterator parse(_ParseContext& __ctx) {
  41     typename _ParseContext::iterator __result = __parser_.__parse(__ctx, __format_spec::__fields_integral);
  42     __format_spec::__process_parsed_bool(__parser_, "a bool");
  43     return __result;
  44   }
  45
  46   template <class _FormatContext>
  47   _LIBCPP_HIDE_FROM_ABI typename _FormatContext::iterator format(bool __value, _FormatContext& __ctx) const {
  48     switch (__parser_.__type_) {
  49     case __format_spec::__type::__default:
  50     case __format_spec::__type::__string:
  51       return __formatter::__format_bool(__value, __ctx, __parser_.__get_parsed_std_specifications(__ctx));
  52
  53     case __format_spec::__type::__binary_lower_case:
  54     case __format_spec::__type::__binary_upper_case:
  55     case __format_spec::__type::__octal:
  56     case __format_spec::__type::__decimal:
  57     case __format_spec::__type::__hexadecimal_lower_case:
  58     case __format_spec::__type::__hexadecimal_upper_case:
  59       // Promotes bool to an integral type. This reduces the number of
  60       // instantiations of __format_integer reducing code size.
  61       return __formatter::__format_integer(
  62           static_cast<unsigned>(__value), __ctx, __parser_.__get_parsed_std_specifications(__ctx));
  63
  64     default:
  65       _LIBCPP_ASSERT_UNCATEGORIZED(false, "The parse function should have validated the type");
  66       __libcpp_unreachable();
  67     }
  68   }
  69
  70   __format_spec::__parser<_CharT> __parser_;
  71 };
  72
  73 #endif //_LIBCPP_STD_VER >= 20
  74
  75 _LIBCPP_END_NAMESPACE_STD
  76
  77 #endif // _LIBCPP___FORMAT_FORMATTER_BOOL_H