diff --git a/format.cc b/format.cc
index 2971be5d..8466358c 100644
--- a/format.cc
+++ b/format.cc
@@ -396,13 +396,14 @@ inline const typename fmt::BasicFormatter<Char>::Arg
 
 template <typename Char>
 void fmt::BasicFormatter<Char>::CheckSign(const Char *&s, const Arg &arg) {
+  char sign = static_cast<char>(*s);
   if (arg.type > LAST_NUMERIC_TYPE) {
     ReportError(s,
-        Format("format specifier '{0}' requires numeric argument") << *s);
+        Format("format specifier '{}' requires numeric argument") << sign);
   }
   if (arg.type == UINT || arg.type == ULONG || arg.type == ULONG_LONG) {
     ReportError(s,
-        Format("format specifier '{0}' requires signed argument") << *s);
+        Format("format specifier '{}' requires signed argument") << sign);
   }
   ++s;
 }
@@ -521,7 +522,7 @@ void fmt::BasicFormatter<Char>::DoFormat() {
             ++s;
             ++num_open_braces_;
             const Arg &precision_arg = ParseArgIndex(s);
-            unsigned long long value = 0;
+            ULongLong value = 0;
             switch (precision_arg.type) {
             case INT:
               if (precision_arg.int_value < 0)
diff --git a/format.h b/format.h
index 4fec8eb4..786049f4 100644
--- a/format.h
+++ b/format.h
@@ -42,21 +42,34 @@
 #include <string>
 #include <sstream>
 
+#ifdef __GNUC__
+# define FMT_GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
+#endif
+
 // Compatibility with compilers other than clang.
 #ifndef __has_feature
 # define __has_feature(x) 0
 #endif
 
+#ifndef FMT_USE_INITIALIZER_LIST
+# define FMT_USE_INITIALIZER_LIST \
+   (__has_feature(cxx_generalized_initializers) || \
+       (FMT_GCC_VERSION >= 404 && __cplusplus >= 201103) || _MSC_VER >= 1700)
+#endif
+
+#if FMT_USE_INITIALIZER_LIST
+# include <initializer_list>
+#endif
+
 // Define FMT_USE_NOEXCEPT to make format use noexcept (C++11 feature).
-#if FMT_USE_NOEXCEPT || \
-    (defined(__has_feature) && __has_feature(cxx_noexcept)) || \
-    (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8))
+#if FMT_USE_NOEXCEPT || __has_feature(cxx_noexcept) || \
+  (FMT_GCC_VERSION >= 408 && __cplusplus >= 201103)
 # define FMT_NOEXCEPT(expr) noexcept(expr)
 #else
 # define FMT_NOEXCEPT(expr)
 #endif
 
-#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)
+#if FMT_GCC_VERSION >= 406
 # define FMT_GCC_DIAGNOSTIC
 # pragma GCC diagnostic push
 # pragma GCC diagnostic ignored "-Wlong-long"
@@ -156,11 +169,16 @@ void Array<T, SIZE>::append(const T *begin, const T *end) {
 }
 
 template <typename Char>
-struct CharTraits;
+class CharTraits;
 
 template <>
-struct CharTraits<char> {
-  typedef wchar_t UnsupportedType;
+class CharTraits<char> {
+ private:
+  // Conversion from wchar_t to char is not supported.
+  static char ConvertWChar(wchar_t);
+
+ public:
+  typedef const wchar_t *UnsupportedStrType;
 
   template <typename T>
   static int FormatFloat(char *buffer, std::size_t size,
@@ -168,8 +186,11 @@ struct CharTraits<char> {
 };
 
 template <>
-struct CharTraits<wchar_t> {
-  typedef char UnsupportedType;
+class CharTraits<wchar_t> {
+ public:
+  typedef const char *UnsupportedStrType;
+
+  static wchar_t ConvertWChar(wchar_t value) { return value; }
 
   template <typename T>
   static int FormatFloat(wchar_t *buffer, std::size_t size,
@@ -565,7 +586,7 @@ class BasicWriter {
   // char stream and vice versa. If you want to print a wide string
   // as a pointer as std::ostream does, cast it to const void*.
   // Do not implement!
-  void operator<<(const typename internal::CharTraits<Char>::UnsupportedType *);
+  void operator<<(typename internal::CharTraits<Char>::UnsupportedStrType);
 
  public:
   /**
@@ -861,12 +882,6 @@ class BasicFormatter {
     template <typename T>
     Arg(T *value);
 
-    // This method is private to disallow formatting of wide characters.
-    // If you want to output a wide character cast it to integer type.
-    // Do not implement!
-    // TODO
-    //Arg(wchar_t value);
-
    public:
     Type type;
     union {
@@ -904,7 +919,10 @@ class BasicFormatter {
     Arg(double value) : type(DOUBLE), double_value(value), formatter(0) {}
     Arg(long double value)
     : type(LONG_DOUBLE), long_double_value(value), formatter(0) {}
-    Arg(Char value) : type(CHAR), int_value(value), formatter(0) {}
+    Arg(char value) : type(CHAR), int_value(value), formatter(0) {}
+    Arg(wchar_t value)
+    : type(CHAR), int_value(internal::CharTraits<Char>::ConvertWChar(value)),
+      formatter(0) {}
 
     Arg(const Char *value) : type(STRING), formatter(0) {
       string.value = value;
@@ -973,10 +991,6 @@ class BasicFormatter {
   BasicFormatter(const BasicFormatter &);
   BasicFormatter& operator=(const BasicFormatter &);
 
-  void Add(const Arg &arg) {
-    args_.push_back(&arg);
-  }
-
   void ReportError(const Char *s, StringRef message) const;
 
   unsigned ParseUInt(const Char *&s) const;
@@ -1015,6 +1029,17 @@ class BasicFormatter {
   BasicFormatter(BasicWriter<Char> &w, const Char *format = 0)
   : writer_(&w), format_(format) {}
 
+#if FMT_USE_INITIALIZER_LIST
+  // Constructs a formatter with formatting arguments.
+  BasicFormatter(BasicWriter<Char> &w,
+      const Char *format, std::initializer_list<Arg> args)
+  : writer_(&w), format_(format) {
+    args_.reserve(args.size());
+    for (const Arg &arg: args)
+      args_.push_back(&arg);
+  }
+#endif
+
   // Performs formatting if the format string is non-null. The format string
   // can be null if its ownership has been transferred to another formatter.
   ~BasicFormatter() {
@@ -1028,7 +1053,7 @@ class BasicFormatter {
   // Feeds an argument to a formatter.
   BasicFormatter &operator<<(const Arg &arg) {
     arg.formatter = this;
-    Add(arg);
+    args_.push_back(&arg);
     return *this;
   }
 
@@ -1117,7 +1142,8 @@ class NoAction {
 
     // Formats an error message and prints it to stdout.
     fmt::Formatter<PrintError> ReportError(const char *format) {
-      return Move(fmt::Formatter<PrintError>(format));
+      fmt::Formatter f<PrintError>(format);
+      return f;
     }
 
     ReportError("File not found: {}") << path;
@@ -1165,12 +1191,6 @@ class Formatter : private Action, public BasicFormatter<Char> {
   }
 };
 
-// Removes a const qualifier from a formatter object making it moveable.
-template <typename Action, typename Char>
-Formatter<Action, Char> &Move(const Formatter<Action, Char> &f) {
-  return const_cast<Formatter<Action, Char> &>(f);
-}
-
 /**
   Fast integer formatter.
  */
@@ -1244,11 +1264,13 @@ class FormatInt {
   \endrst
 */
 inline Formatter<> Format(StringRef format) {
-  return Move(Formatter<>(format));
+  Formatter<> f(format);
+  return f;
 }
 
 inline Formatter<NoAction, wchar_t> Format(WStringRef format) {
-  return Move(Formatter<NoAction, wchar_t>(format));
+  Formatter<NoAction, wchar_t> f(format);
+  return f;
 }
 
 /** A formatting action that writes formatted output to stdout. */
@@ -1264,7 +1286,8 @@ class Write {
 // Example:
 //   Print("Elapsed time: {0:.2f} seconds") << 1.23;
 inline Formatter<Write> Print(StringRef format) {
-  return Move(Formatter<Write>(format));
+  Formatter<Write> f(format);
+  return f;
 }
 }