zsy056 opened a new pull request, #3312:
URL: https://github.com/apache/thrift/pull/3312

   
   Add template_streamop support in the C++ generator so generated operator<< 
and printTo can target generic stream-like output types. Keep default behavior 
unchanged when the option is not set (std::ostream signatures remain). Add 
compiler/runtime coverage for template generation, friend declaration 
correctness, enums, and collection printing.
   
   default:
   ```cpp
   std::ostream& operator<<(std::ostream& out, const SimpleStruct& obj);
   
   class SimpleStruct {
   public:
     void printTo(std::ostream& out) const;
   };
   ```
   
   with `template_streamop`:
   ```cpp
   template <typename OStream_>
   OStream_& operator<<(OStream_& out, const SimpleStruct& obj);
   
   class SimpleStruct {
   public:
     template <typename OStream_>
     void printTo(OStream_& out) const;
   };
   ```
   
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