Add a formatter for float128

Author: vitaut

Diff for: include/fmt/base.h

@@ -2799,35 +2799,25 @@ FMT_API void vprint_mojibake(FILE*, string_view, format_args, bool = false);
 #ifndef _WIN32
 inline void vprint_mojibake(FILE*, string_view, format_args, bool) {}
 #endif
-}  // namespace detail
-
-FMT_BEGIN_EXPORT
 
-// A formatter specialization for natively supported types.
-template <typename T, typename Char>
-struct formatter<T, Char,
-                 enable_if_t<detail::type_constant<T, Char>::value !=
-                             detail::type::custom_type>> {
+template <typename T, typename Char, type TYPE> struct native_formatter {
  private:
-  detail::dynamic_format_specs<Char> specs_;
+  dynamic_format_specs<Char> specs_;
 
  public:
   using nonlocking = void;
 
   template <typename ParseContext>
   FMT_CONSTEXPR auto parse(ParseContext& ctx) -> const Char* {
     if (ctx.begin() == ctx.end() || *ctx.begin() == '}') return ctx.begin();
-    auto type = detail::type_constant<T, Char>::value;
-    auto end =
-        detail::parse_format_specs(ctx.begin(), ctx.end(), specs_, ctx, type);
-    if (type == detail::type::char_type) detail::check_char_specs(specs_);
+    auto end = parse_format_specs(ctx.begin(), ctx.end(), specs_, ctx, TYPE);
+    if (TYPE == type::char_type) check_char_specs(specs_);
     return end;
   }
 
-  template <detail::type U = detail::type_constant<T, Char>::value,
-            FMT_ENABLE_IF(U == detail::type::string_type ||
-                          U == detail::type::cstring_type ||
-                          U == detail::type::char_type)>
+  template <type U = TYPE,
+            FMT_ENABLE_IF(U == type::string_type || U == type::cstring_type ||
+                          U == type::char_type)>
   FMT_CONSTEXPR void set_debug_format(bool set = true) {
     specs_.type = set ? presentation_type::debug : presentation_type::none;
   }
@@ -2836,6 +2826,17 @@ struct formatter<T, Char,
   FMT_CONSTEXPR auto format(const T& val, FormatContext& ctx) const
       -> decltype(ctx.out());
 };
+}  // namespace detail
+
+FMT_BEGIN_EXPORT
+
+// A formatter specialization for natively supported types.
+template <typename T, typename Char>
+struct formatter<T, Char,
+                 enable_if_t<detail::type_constant<T, Char>::value !=
+                             detail::type::custom_type>>
+    : detail::native_formatter<T, Char, detail::type_constant<T, Char>::value> {
+};
 
 template <typename Char = char> struct runtime_format_string {
   basic_string_view<Char> str;

Diff for: include/fmt/format.h

@@ -4321,8 +4321,27 @@ extern template FMT_API auto decimal_point_impl(locale_ref) -> char;
 extern template FMT_API auto decimal_point_impl(locale_ref) -> wchar_t;
 #endif  // FMT_HEADER_ONLY
 
+template <typename T, typename Char, type TYPE>
+template <typename FormatContext>
+FMT_CONSTEXPR FMT_INLINE auto native_formatter<T, Char, TYPE>::format(
+    const T& val, FormatContext& ctx) const -> decltype(ctx.out()) {
+  if (specs_.width_ref.kind == arg_id_kind::none &&
+      specs_.precision_ref.kind == arg_id_kind::none) {
+    return write<Char>(ctx.out(), val, specs_, ctx.locale());
+  }
+  auto specs = specs_;
+  handle_dynamic_spec<width_checker>(specs.width, specs.width_ref, ctx);
+  handle_dynamic_spec<precision_checker>(specs.precision, specs.precision_ref,
+                                         ctx);
+  return write<Char>(ctx.out(), val, specs, ctx.locale());
+}
 }  // namespace detail
 
+template <typename Char>
+struct formatter<detail::float128, Char>
+    : detail::native_formatter<detail::float128, Char,
+                               detail::type::float_type> {};
+
 #if FMT_USE_USER_DEFINED_LITERALS
 inline namespace literals {
 /**
@@ -4412,26 +4431,6 @@ FMT_NODISCARD FMT_INLINE auto formatted_size(const Locale& loc,
 
 FMT_END_EXPORT
 
-template <typename T, typename Char>
-template <typename FormatContext>
-FMT_CONSTEXPR FMT_INLINE auto
-formatter<T, Char,
-          enable_if_t<detail::type_constant<T, Char>::value !=
-                      detail::type::custom_type>>::format(const T& val,
-                                                          FormatContext& ctx)
-    const -> decltype(ctx.out()) {
-  if (specs_.width_ref.kind == detail::arg_id_kind::none &&
-      specs_.precision_ref.kind == detail::arg_id_kind::none) {
-    return detail::write<Char>(ctx.out(), val, specs_, ctx.locale());
-  }
-  auto specs = specs_;
-  detail::handle_dynamic_spec<detail::width_checker>(specs.width,
-                                                     specs.width_ref, ctx);
-  detail::handle_dynamic_spec<detail::precision_checker>(
-      specs.precision, specs.precision_ref, ctx);
-  return detail::write<Char>(ctx.out(), val, specs, ctx.locale());
-}
-
 FMT_END_NAMESPACE
 
 #ifdef FMT_HEADER_ONLY