error _x is not a member of gazebo::math::Pose

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Hi, I am using the following : math::Pose A = this->model->GetWorldPose(); while(A._x!= pointB[0] && A._y!=pointB[1] && A._z!=pointC[2]) do something

on compiling i am getting the error, ‘class gazebo::math::Pose’ has no member named ‘_x’ ‘class gazebo::math::Pose’ has no member named ‘_y’ ‘class gazebo::math::Pose’ has no member named ‘_z’

But the API[1] does show _x _y and _z as double members of math::Pose.

[1]http://osrf-distributions.s3.amazonaws.com/gazebo/api/7.0.0/classgazebo_1_1math_1_1Pose.html#a89b25f91820943a4d887120a7588e61f