Github user hcorg commented on a diff in the pull request:

    https://github.com/apache/thrift/pull/469#discussion_r29373647
  
    --- Diff: compiler/cpp/src/generate/t_cpp_generator.cc ---
    @@ -1699,6 +1723,24 @@ void 
t_cpp_generator::generate_struct_ostream_operator(std::ofstream& out, t_str
       out << "}" << endl << endl;
     }
     
    +/**                                                                        
                                                                   
    + * Generates what() method for exceptions                                  
                                                                   
    + */                                                                        
                                                                   
    +void t_cpp_generator::generate_exception_what_method(std::ofstream& out, 
t_struct* tstruct) {
    +  out << indent();
    +  generate_exception_what_method_decl(out, tstruct, true);
    +  out << " {" << endl;
    +
    +  indent_up();
    +
    +  out << indent() << "std::stringstream ss;" << endl;
    +  out << indent() << "ss << \"TException - service has thrown: \" << 
*this;" << endl;
    +  out << indent() << "return ss.str().c_str();" << endl;
    --- End diff --
    
    this can cause Segmenation Fault, as ss will be destroyed on function exit 
but pointer to it external contents is returned...
    
    Please do try making a unit test for that functionality


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