c++ - Setting a Protobuf Submessage or Embeded Message and return the Message Object -


i run segfault when using protocol-buffers submessages. can't post code try give example.

the .proto code this:

message {     optional int id = 1;     optional submessage submsg = 2; }  submessage {     optional int foo = 1; }

in c++ code have function creates , returns submessage other function embeds submessage message , returns 1 other function,...

submessage createsubmessage() {     submessage smsg;     smsg.set_foo(12);     return smsg; }  message createmessage() {     message msg;     // line segfault, without not     submessage* smsg = msg.mutable_submsg();     // segfault no matter if     // set submessage or not.      // smsg.copyfrom(createsubmessage();     return msg; }  void foo() {     for(;;) {         message msg;         msg = createmessage();    } }

and error getting coming submessage::mergefrom()

[libprotobuf fatal messges_pb.cc:1128] check failed: (&from) != (this):  segmentation fault

the segfault interestingly appears in second iteration of loop, @ second assignment msg.

i tried lot of fuzzing, allocating submessage on heap , setting set_allocated_submsg(), copyfrom(), mergefrom(), copy constructors , on,... still running same problem.

i think var msg in function createmessage() destroyed , disallocated after return of function.

you should try use msg attribut of main class.


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