[protobuf] Services not compiling

[jdoliner]

Hi,

I'm new to protocol buffers so apologies if this is something stupid.
(I searched the forum and didn't find anything). I'm having a problem
getting services to compile. I have the following population.proto
file:


package population;

message addrinfo {
    required fixed32 ip = 1;
    required uint32 port = 2;
    required uint32 id = 3;
}

message Join_initial {
    required addrinfo addr = 1;
}

message Join_propose {
    required addrinfo addr = 1;
}

message Join_respond {
    required bool agree = 1;
}

message Join_mk_official {
    required addrinfo addr = 1;
}

message Join_ack_official {
}

message Join_welcome {
    repeated addrinfo addrs= 1;
}

service JoinService {
    rpc Join (Join_initial) returns (Join_welcome);
    rpc Propose (Join_propose) returns (Join_respond);
    rpc Make_official (Join_mk_official) returns (Join_ack_official);
}

And when I compile it with:
protoc --cpp_out=. population.proto

I get population.pb.{cc|h} but nowhere in either one is there mention
of the JoinService class. Am I doing something wrong?

My libprotoc version is 2.4.0.

Thanks.

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