shenhui0509 commented on pull request #334:
URL: 
https://github.com/apache/rocketmq-client-cpp/pull/334#issuecomment-713624787


   > The extFields is map<string, string>, so I think you should add a 
specialization of `UtilAll::to_string`. For example:
   > 
   > ```c++
   > template <>
   > inline std::string UtilAll::to_string<bool>(bool value) {
   >   return value ? "true" : "false";
   > }
   > ```
   > 
   > see: 
https://github.com/ifplusor/rocketmq-client-cpp/blob/a750efad307a98c49b20d2beebc763633af2e472/src/common/UtilAll.h#L153
   
   resolved


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