How to assign a singel nested object value in C++?

[Nigel Pickard]

I'm having a problem working out how to assign a nested object's value
in C++ (my Java version works fine). E.g. in the proto file for my
car object I define:

import "mycustomengine.proto";
message MyCar {
optional string name = 1;
optional string model = 2;
optional MyCustomEngine customengine = 3;

Note I have assigned there to only be 0 or 1 MyCustomEngines to a Car
object. Now in my code, I've already created an instance of
MyCustomEngine, e.g.:

my::objects::MyCustomEngine myCustomEngine;
myCustomEngine.set_name("hey, this is my custom engine!");

Now I create my Car object....

my::objects::MyCar myCar;
myCar.set_name("Ford");
myCar.set_model("Fiesta");

But now I'm stuck on how to assign the myCustomEngine instance to the
myCar instance? There appears to be no method such as
"myCar.set_customengine(myCustomEngine)". So any ideas on how to do
this?

[Henner Zeller]

it is something along the lines of
myCar.mutable_customengine()->CopyFrom(myCustomEngine).

Since this copies data, you might want to consider setting things
directly in the customengine in the first place - if this is time
critical.

void InitCustomEngine(MyCustomEngine *engine) {
engine->set_name("My cool custom engine");
}

...
myCar.set_name("foo");
InitCustomEngine(myCar.mutable_customengine());

> this?
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[Nigel Pickard]

Henner:

excellent, that worked.... I knew someone must have done that
already!

Thanks again,

Nigel