From aecec01b34aa3d1bb3fb991d4f75b0750508f9a0 Mon Sep 17 00:00:00 2001
From: Victor Zverovich <viz@meta.com>
Date: Fri, 22 Mar 2024 14:17:47 +0900
Subject: [PATCH] Initial support for extended FP types

---
 include/fmt/base.h   | 12 +++++++-----
 include/fmt/format.h |  4 +++-
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/include/fmt/base.h b/include/fmt/base.h
index 6dedd4ec0387..b08d8267ff9f 100644
--- a/include/fmt/base.h
+++ b/include/fmt/base.h
@@ -1505,12 +1505,14 @@ template <typename Context> struct arg_mapper {
     return {};
   }
 
+  // is_fundamental is used to allow formatters for extended FP types.
   template <typename T, typename U = remove_const_t<T>,
-            FMT_ENABLE_IF((std::is_class<U>::value || std::is_enum<U>::value ||
-                           std::is_union<U>::value) &&
-                          !has_to_string_view<U>::value && !is_char<U>::value &&
-                          !is_named_arg<U>::value &&
-                          !std::is_arithmetic<format_as_t<U>>::value)>
+            FMT_ENABLE_IF(
+                (std::is_class<U>::value || std::is_enum<U>::value ||
+                 std::is_union<U>::value || std::is_fundamental<U>::value) &&
+                !has_to_string_view<U>::value && !is_char<U>::value &&
+                !is_named_arg<U>::value && !std::is_integral<U>::value &&
+                !std::is_arithmetic<format_as_t<U>>::value)>
   FMT_MAP_API auto map(T& val) -> decltype(FMT_DECLTYPE_THIS do_map(val)) {
     return do_map(val);
   }
diff --git a/include/fmt/format.h b/include/fmt/format.h
index c68bf2fb41af..4b0babe80779 100644
--- a/include/fmt/format.h
+++ b/include/fmt/format.h
@@ -3716,7 +3716,9 @@ FMT_CONSTEXPR auto write(OutputIt out, const T& value) -> enable_if_t<
 template <typename Char, typename OutputIt, typename T,
           typename Context = basic_format_context<OutputIt, Char>>
 FMT_CONSTEXPR auto write(OutputIt out, const T& value)
-    -> enable_if_t<mapped_type_constant<T, Context>::value == type::custom_type,
+    -> enable_if_t<mapped_type_constant<T, Context>::value ==
+                           type::custom_type &&
+                       !std::is_fundamental<T>::value,
                    OutputIt> {
   auto formatter = typename Context::template formatter_type<T>();
   auto parse_ctx = typename Context::parse_context_type({});