30 #ifndef _GLIBCXX_FORMAT_FWD_H
31 #define _GLIBCXX_FORMAT_FWD_H 1
33 #ifdef _GLIBCXX_SYSHDR
34 #pragma GCC system_header
38 #ifdef __glibcxx_format
41 #include <type_traits>
42 #if __glibcxx_format_ranges
46 namespace std _GLIBCXX_VISIBILITY(default)
48 _GLIBCXX_BEGIN_NAMESPACE_VERSION
51 template<
typename _Out,
typename _CharT>
class basic_format_context;
54 template<
typename _CharT>
class basic_format_parse_context;
57 template<
typename _Tp,
typename _CharT =
char>
struct formatter;
62 #ifdef _GLIBCXX_USE_WCHAR_T
63 template<
typename _CharT>
64 concept __char = same_as<_CharT, char> || same_as<_CharT, wchar_t>;
66 template<
typename _CharT>
67 concept __char = same_as<_CharT, char>;
70 template<
typename _Tp,
typename _Context,
72 =
typename _Context::template formatter_type<remove_const_t<_Tp>>,
73 typename _ParseContext
74 = basic_format_parse_context<typename _Context::char_type>>
75 concept __parsable_with
76 = semiregular<_Formatter>
77 && requires (_Formatter __f, _ParseContext __pc)
79 { __f.parse(__pc) } -> same_as<typename _ParseContext::iterator>;
82 template<
typename _Tp,
typename _Context,
84 =
typename _Context::template formatter_type<remove_const_t<_Tp>>,
85 typename _ParseContext
86 = basic_format_parse_context<typename _Context::char_type>>
87 concept __formattable_with
88 = semiregular<_Formatter>
89 && requires (
const _Formatter __cf, _Tp&& __t, _Context __fc)
91 { __cf.format(__t, __fc) } -> same_as<typename _Context::iterator>;
95 template<
typename _CharT>
97 template<
typename _CharT>
98 using _Iter_for_t =
typename _Iter_for<_CharT>::type;
100 template<
typename _Tp,
typename _CharT,
101 typename _Context = basic_format_context<_Iter_for_t<_CharT>, _CharT>>
102 concept __formattable_impl
103 = __parsable_with<_Tp, _Context> && __formattable_with<_Tp, _Context>;
105 template<
typename _Formatter>
106 concept __has_debug_format = requires(_Formatter __f)
108 __f.set_debug_format();
111 template<__
char _CharT>
112 struct __formatter_int;
116 #if __glibcxx_format_ranges
118 template<
typename _Tp,
typename _CharT>
120 = __format::__formattable_impl<remove_reference_t<_Tp>, _CharT>;
122 template<
typename _Tp, __format::__
char _CharT =
char>
123 requires same_as<remove_cvref_t<_Tp>, _Tp> && formattable<_Tp, _CharT>
124 class range_formatter;
129 template<
typename _Rg,
typename _CharT>
130 concept __const_formattable_range
131 = ranges::input_range<const _Rg>
132 && formattable<ranges::range_reference_t<const _Rg>, _CharT>;
134 template<
typename _Rg,
typename _CharT>
135 using __maybe_const_range
136 = __conditional_t<__const_formattable_range<_Rg, _CharT>,
const _Rg, _Rg>;
138 template<
typename _Tp,
typename _CharT>
140 = __conditional_t<formattable<const _Tp, _CharT>,
const _Tp, _Tp>;
145 _GLIBCXX_END_NAMESPACE_VERSION
ISO C++ entities toplevel namespace is std.