From 36d14b8ce31700f8f86df7f3a7538aa6d697a176 Mon Sep 17 00:00:00 2001
From: yumeyao <yumeyao@gmail.com>
Date: Tue, 2 Mar 2021 14:40:33 +0800
Subject: [PATCH] add an extra check if the user mis-declares
 formatter<custom_type>::store()'s first arguments as non-reference

---
 include/fmt/fmtlog.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/fmt/fmtlog.h b/include/fmt/fmtlog.h
index 16b94341..2ffe6654 100644
--- a/include/fmt/fmtlog.h
+++ b/include/fmt/fmtlog.h
@@ -67,7 +67,9 @@ using stored_as_string_object = std::integral_constant<bool, stored_as_string<Ty
 
 struct custom_store_method_checker {
     template <typename Arg, typename Context, typename RawT = std::decay_t<Arg>, typename Formatter = typename Context::template formatter_type<RawT>>
-    static std::enable_if_t<has_formatter<RawT, Context>::value, std::tuple<std::true_type, decltype(Formatter::store(std::declval<char*&>(), std::declval<Arg>()))>> test(int);
+    static std::enable_if_t<has_formatter<RawT, Context>::value, std::tuple<std::true_type, decltype(Formatter::store(std::declval<char*&>(), std::declval<Arg>()))>> test(double);
+    template <typename Arg, typename Context, typename RawT = std::decay_t<Arg>, typename Formatter = typename Context::template formatter_type<RawT>>
+    static std::enable_if_t<has_formatter<RawT, Context>::value, std::tuple<std::false_type, decltype(Formatter::store(std::declval<char*>(), std::declval<Arg>()))>> test(int);
     template <typename Arg, typename Context>
     static std::tuple<std::false_type, store_as_object> test(...);
 };