Filling geometry_msgs/Pose2D[] message

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Hello,

i am failing to fill a ros message and google serves me no good.

The message is of the following format

Header header
string child_frame_id
geometry_msgs/Pose2D[] pose

Maybe i lack the needes C++ skills, but i just dont understand the automatic created class for this message. How do i fill Pose2D elements to a new message?

I tried something like the following without success:

pedestrianSim::pedestrians msg;
geometry_msgs::Pose2D_ singlePos;
singlePos.x = x;
singlePos.y = y;
singlePos.theta = omega;
msg.pose.push_back( singlePos );

Thank you for your help!

Regards, Manuel