i have a vector3 class.
class vector3
{
    float x, y, z;
}

node["x"] = vector3.x;
node["y"] = vector3.y;
node["z"] = vector3.z;

the result is
    x: 0
    y: 0
    z: 0

i want the result to be:
   {x: 0, y: 0, z: 0}

if use the old api, i can use YAML::Flow to set the style:
YAML::Emitter emitter;
out << YAML::Flow  << YAML::BeginMap << YAML::Key << "x" << YAML::Value << x << 
YAML::EndMap

use the new api, how to set the style?

thanks.