如何将标准容器作为字段添加到 OMNet++ 消息中？

Question

I'm trying to create a simple message definition that contains a field implemented using std::vector . Per the OMNet++ 5.5 manual ch.6 sec.8.1 , this is seemingly straightforward.

However, I'm using OMNet++ 6.0pre6: I can't figure out what the correct way of doing this is, as the manual is out of date ¹ , and the changes are very superficially referred to in the nedxml changelog.

The message definition can be boiled down to the exact example in the manual , but in this case it is a message rather than a packet (either yields same error):

cplusplus {{
#include <vector>
typedef std::vector<int> IntVector;
}}

class noncobject IntVector;

message SimpleMsg {
    int this_thing;
    int that_thing;
    IntVector these_things;
}

The following errors were provided by opp_msgtool , the messages-to-C++ transpiler:

SimpleMsg.msg:6: Error: Type declarations are not needed with imports, try invoking the message compiler in legacy (4.x) mode using the --msg4 option
SimpleMsg.msg:11: Error: unknown type 'IntVector' for field 'these_things' in 'SimpleMsg'

Thinking type declarations are not needed with imports could be the simple summary of the changes from OMNet 5.x to 6.x, I proceeded to remove class noncobject IntVector . While it removes the first error, it still yields Error: unknown type 'IntVector' for field 'these_things' in 'SimpleMsg' .

Ideas? Suggestions? Lessons to be had?

EDIT : Notably found that there are some notes in the nedxml changelog referring to changes between 4.0-5.x and 6.0 , but how to ideally use it is less clear.

---

¹ Certainly not wholly applicable to OMNet++ 6.0 at the very least.

Answer 1

It should be something like this:

cplusplus {{
#include <vector>
typedef std::vector<int> IntVector;
}}

class IntVector {
    @existingClass;
}

message SimpleMsg {
    int this_thing;
    int that_thing;
    IntVector these_things;
}

An alternate 'solution' is to force the message compiler into 4.x compatible (old mode). Just add the following line in a makefrag file

MSGC:=$(MSGC) --msg4

However, sooner or later you should convert your code. If you want your code to compile with both OMNeT++ 5.5 and 6.0 then you should definitely specify the MSG compiler version explicitly. Either to be 4.x or 6.x compatible.