diff --git a/fmt/format.h b/fmt/format.h
index 55361ecd..bc64c026 100644
--- a/fmt/format.h
+++ b/fmt/format.h
@@ -1388,10 +1388,7 @@ class ArgList {
   };
 
   internal::Arg::Type type(unsigned index) const {
-    unsigned shift = index * 4;
-    uint64_t mask = 0xf;
-    return static_cast<internal::Arg::Type>(
-          (types_ & (mask << shift)) >> shift);
+    return type(types_, index);
   }
 
   template <typename Char>
@@ -1408,6 +1405,8 @@ class ArgList {
   ArgList(ULongLong types, const internal::Arg *args)
   : types_(types), args_(args) {}
 
+  uint64_t types() const { return types_; }
+
   /** Returns the argument at specified index. */
   internal::Arg operator[](unsigned index) const {
     using internal::Arg;
@@ -1433,6 +1432,13 @@ class ArgList {
     }
     return args_[index];
   }
+
+  static internal::Arg::Type type(uint64_t types, unsigned index) {
+    unsigned shift = index * 4;
+    uint64_t mask = 0xf;
+    return static_cast<internal::Arg::Type>(
+          (types & (mask << shift)) >> shift);
+  }
 };
 
 #define FMT_DISPATCH(call) static_cast<Impl*>(this)->call