+template <class V>
+class FormatValue<detail::DefaultValueWrapper<dynamic, V>> {
+ public:
+ explicit FormatValue(
+ const detail::DefaultValueWrapper<dynamic, V>& val)
+ : val_(val) { }
+
+ template <class FormatCallback>
+ void format(FormatArg& arg, FormatCallback& cb) const {
+ auto& c = val_.container;
+ switch (c.type()) {
+ case dynamic::NULLT:
+ case dynamic::BOOL:
+ case dynamic::INT64:
+ case dynamic::STRING:
+ case dynamic::DOUBLE:
+ FormatValue<dynamic>(c).format(arg, cb);
+ break;
+ case dynamic::ARRAY:
+ {
+ int key = arg.splitIntKey();
+ if (key >= 0 && key < c.size()) {
+ FormatValue<dynamic>(c.at(key)).format(arg, cb);
+ } else{
+ FormatValue<V>(val_.defaultValue).format(arg, cb);
+ }
+ }
+ break;
+ case dynamic::OBJECT:
+ {
+ auto pos = c.find(arg.splitKey());
+ if (pos != c.items().end()) {
+ FormatValue<dynamic>(pos->second).format(arg, cb);
+ } else {
+ FormatValue<V>(val_.defaultValue).format(arg, cb);
+ }
+ }
+ break;
+ }
+ }
+
+ private:
+ const detail::DefaultValueWrapper<dynamic, V>& val_;
+};
+
+} // namespaces