diff --git a/include/libimp/log.h b/include/libimp/log.h
index 97958ee..33c38d2 100644
--- a/include/libimp/log.h
+++ b/include/libimp/log.h
@@ -15,7 +15,7 @@
 #include "libimp/def.h"
 #include "libimp/detect_plat.h"
 #include "libimp/export.h"
-#include "libimp/enum_cast.h"
+#include "libimp/underlyof.h"
 #include "libimp/fmt.h"
 #include "libimp/generic.h"
 
@@ -60,7 +60,7 @@ bool context_to_string(fmt_context &f_ctx, context<T...> const &l_ctx) noexcept
   LIBIMP_TRY {
     auto ms = std::chrono::time_point_cast<std::chrono::milliseconds>(l_ctx.tp).time_since_epoch().count() % 1000;
     return detail::unfold_tuple_fmt_to(f_ctx, l_ctx.params, std::index_sequence_for<T...>{},
-                                      "[", types[enum_cast(l_ctx.level)], "]"
+                                      "[", types[underlyof(l_ctx.level)], "]"
                                       "[", l_ctx.tp, ".", spec("03")(ms), "]"
                                       "[", l_ctx.func, "] ");
   } LIBIMP_CATCH(...) {
@@ -185,7 +185,7 @@ class grip {
 
   template <typename... A>
   grip &output(log::level l, A &&... args) noexcept {
-    if (!printer_ || (enum_cast(l) < enum_cast(level_limit_))) {
+    if (!printer_ || (underlyof(l) < underlyof(level_limit_))) {
       return *this;
     }
     printer_.output(context<A &&...> {
diff --git a/include/libimp/enum_cast.h b/include/libimp/underlyof.h
similarity index 77%
rename from include/libimp/enum_cast.h
rename to include/libimp/underlyof.h
index 4b6e01d..edef44f 100644
--- a/include/libimp/enum_cast.h
+++ b/include/libimp/underlyof.h
@@ -1,5 +1,5 @@
 /**
- * \file libimp/enum_cast.h
+ * \file libimp/underlyof.h
  * \author mutouyun (orz@orzz.org)
  * \brief Returns the underlying type of the given enum
  * \date 2022-03-01
@@ -14,8 +14,9 @@ LIBIMP_NAMESPACE_BEG_
 
 /// \brief Returns after converting the value to the underlying type of E.
 /// \see https://en.cppreference.com/w/cpp/types/underlying_type
+///      https://en.cppreference.com/w/cpp/utility/to_underlying
 template <typename E>
-constexpr auto enum_cast(E e) noexcept {
+constexpr auto underlyof(E e) noexcept {
   return static_cast<std::underlying_type_t<E>>(e);
 }
 
diff --git a/src/libimp/platform/posix/system.h b/src/libimp/platform/posix/system.h
index 0c9ec9c..fab18b7 100644
--- a/src/libimp/platform/posix/system.h
+++ b/src/libimp/platform/posix/system.h
@@ -71,11 +71,11 @@ result<std::int64_t> conf(info r) noexcept {
     break;
   }
   default:
-    log.error("invalid info = ", enum_cast(r));
+    log.error("invalid info = ", underlyof(r));
     return {};
   }
   auto err = sys::error();
-  log.error("info = ", enum_cast(r), ", error = ", err);
+  log.error("info = ", underlyof(r), ", error = ", err);
   return {false, (int)err.code()};
 }
 
diff --git a/src/libimp/platform/win/system.h b/src/libimp/platform/win/system.h
index 9cfe4ab..8d59e08 100644
--- a/src/libimp/platform/win/system.h
+++ b/src/libimp/platform/win/system.h
@@ -14,7 +14,7 @@
 #include "libimp/system.h"
 #include "libimp/log.h"
 #include "libimp/codecvt.h"
-#include "libimp/enum_cast.h"
+#include "libimp/underlyof.h"
 #include "libimp/detect_plat.h"
 
 LIBIMP_NAMESPACE_BEG_
@@ -94,7 +94,7 @@ result<std::int64_t> conf(info r) noexcept {
     return (std::int64_t)info.dwPageSize;
   }
   default:
-    log.error("invalid info = ", enum_cast(r));
+    log.error("invalid info = ", underlyof(r));
     return {};
   }
 }