Move generic format functions to format.h

include/fmt/os.h

@@ -432,13 +432,12 @@ class ostream final : private detail::buffer<char> {
   }
 
   /**
-    Formats ``args`` according to specifications in ``format_str`` and writes
-    the output to the file.
+    Formats ``args`` according to specifications in ``fmt`` and writes the
+    output to the file.
    */
-  template <typename S, typename... Args>
-  void print(const S& format_str, Args&&... args) {
-    format_to(detail::buffer_appender<char>(*this), format_str,
-              std::forward<Args>(args)...);
+  template <typename... T> void print(format_string<T...> fmt, T&&... args) {
+    vformat_to(detail::buffer_appender<char>(*this), fmt,
+               make_format_args(args...));
   }
 };