From 9c331ba03d3a489b1bf8bbd256578247ee714dbc Mon Sep 17 00:00:00 2001
From: mutouyun <orz@orzz.org>
Date: Mon, 28 Nov 2022 22:32:39 +0800
Subject: [PATCH] =?UTF-8?q?fix:=20=E2=80=98fmt=E2=80=99=20was=20not=20decl?=
 =?UTF-8?q?ared?=
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---
 include/libimp/fmt.h  | 12 ++++++++++++
 include/libimp/span.h | 17 -----------------
 2 files changed, 12 insertions(+), 17 deletions(-)

diff --git a/include/libimp/fmt.h b/include/libimp/fmt.h
index b76f715..67f32cc 100644
--- a/include/libimp/fmt.h
+++ b/include/libimp/fmt.h
@@ -111,5 +111,17 @@ auto tag_invoke(fmt_to_string_t, fmt_ref<T> arg) noexcept
   return ::LIBIMP::to_string(static_cast<T>(arg.param), arg.fstr);
 }
 
+template <typename T>
+std::string tag_invoke(decltype(::LIBIMP::fmt_to_string), span<T> s) {
+  if (s.empty()) {
+    return {};
+  }
+  auto appender = fmt(s[0]);
+  for (std::size_t i = 1; i < s.size(); ++i) {
+    appender += fmt(' ', s[i]);
+  }
+  return appender;
+}
+
 } // namespace detail
 LIBIMP_NAMESPACE_END_
diff --git a/include/libimp/span.h b/include/libimp/span.h
index ec88c37..fd25f49 100644
--- a/include/libimp/span.h
+++ b/include/libimp/span.h
@@ -19,7 +19,6 @@
 
 #include "libimp/def.h"
 #include "libimp/detect_plat.h"
-#include "libimp/fmt_cpo.h"
 
 #if defined(LIBIMP_CPP_20) && defined(__cpp_lib_span)
 #include <span>
@@ -267,20 +266,4 @@ inline auto make_span(std::string const &str) noexcept -> span<char const> {
   return {str.data(), str.size()};
 }
 
-/// @brief Custom defined fmt_to_string method for imp::fmt
-namespace detail {
-
-template <typename T>
-std::string tag_invoke(decltype(::LIBIMP::fmt_to_string), span<T> s) {
-  if (s.empty()) {
-    return {};
-  }
-  auto appender = fmt(s[0]);
-  for (std::size_t i = 1; i < s.size(); ++i) {
-    appender += fmt(' ', s[i]);
-  }
-  return appender;
-}
-
-} // namespace detail
 LIBIMP_NAMESPACE_END_