libcxx/include/__format/formatter_pointer.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_POINTER_H
  11 #define _LIBCPP___FORMAT_FORMATTER_POINTER_H
  12
  13 #include <__config>
  14 #include <__cstddef/nullptr_t.h>
  15 #include <__format/concepts.h>
  16 #include <__format/format_parse_context.h>
  17 #include <__format/formatter.h>
  18 #include <__format/formatter_integral.h>
  19 #include <__format/formatter_output.h>
  20 #include <__format/parser_std_format_spec.h>
  21 #include <cstdint>
  22
  23 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  24 #  pragma GCC system_header
  25 #endif
  26
  27 _LIBCPP_BEGIN_NAMESPACE_STD
  28
  29 #if _LIBCPP_STD_VER >= 20
  30
  31 template <__fmt_char_type _CharT>
  32 struct _LIBCPP_TEMPLATE_VIS __formatter_pointer {
  33 public:
  34   template <class _ParseContext>
  35   _LIBCPP_HIDE_FROM_ABI constexpr typename _ParseContext::iterator parse(_ParseContext& __ctx) {
  36     typename _ParseContext::iterator __result = __parser_.__parse(__ctx, __format_spec::__fields_pointer);
  37     __format_spec::__process_display_type_pointer(__parser_.__type_, "a pointer");
  38     return __result;
  39   }
  40
  41   template <class _FormatContext>
  42   _LIBCPP_HIDE_FROM_ABI typename _FormatContext::iterator format(const void* __ptr, _FormatContext& __ctx) const {
  43     __format_spec::__parsed_specifications<_CharT> __specs = __parser_.__get_parsed_std_specifications(__ctx);
  44     __specs.__std_.__alternate_form_                       = true;
  45     __specs.__std_.__type_ =
  46         __specs.__std_.__type_ == __format_spec::__type::__pointer_upper_case
  47             ? __format_spec::__type::__hexadecimal_upper_case
  48             : __format_spec::__type::__hexadecimal_lower_case;
  49
  50     return __formatter::__format_integer(reinterpret_cast<uintptr_t>(__ptr), __ctx, __specs);
  51   }
  52
  53   __format_spec::__parser<_CharT> __parser_;
  54 };
  55
  56 // [format.formatter.spec]/2.4
  57 // For each charT, the pointer type specializations template<>
  58 // - struct formatter<nullptr_t, charT>;
  59 // - template<> struct formatter<void*, charT>;
  60 // - template<> struct formatter<const void*, charT>;
  61 template <__fmt_char_type _CharT>
  62 struct _LIBCPP_TEMPLATE_VIS formatter<nullptr_t, _CharT> : public __formatter_pointer<_CharT> {};
  63 template <__fmt_char_type _CharT>
  64 struct _LIBCPP_TEMPLATE_VIS formatter<void*, _CharT> : public __formatter_pointer<_CharT> {};
  65 template <__fmt_char_type _CharT>
  66 struct _LIBCPP_TEMPLATE_VIS formatter<const void*, _CharT> : public __formatter_pointer<_CharT> {};
  67
  68 #  if _LIBCPP_STD_VER >= 23
  69 template <>
  70 inline constexpr bool enable_nonlocking_formatter_optimization<nullptr_t> = true;
  71 template <>
  72 inline constexpr bool enable_nonlocking_formatter_optimization<void*> = true;
  73 template <>
  74 inline constexpr bool enable_nonlocking_formatter_optimization<const void*> = true;
  75 #  endif // _LIBCPP_STD_VER >= 23
  76 #endif   // _LIBCPP_STD_VER >= 20
  77
  78 _LIBCPP_END_NAMESPACE_STD
  79
  80 #endif // _LIBCPP___FORMAT_FORMATTER_POINTER_H