setUpdatePeriod() in gmapping?

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Hi all,

I'm tracing the code of gmapping and try to find out the parameter "temporalUpdate" usage in: https://svn.openslam.org/data/svn/gma...

In slam_gmapping.cpp(https://github.com/ros-perception/slam_gmapping/blob/hydro-devel/gmapping/src/slam_gmapping.cpp), it looks like the parameter is used in line#508

line#508:  gsp_->setUpdatePeriod(temporalUpdate_);

but I can not find the setUpdatePeriod() method in gridslamprocessor.cpp or gridslamprocessor.h.

https://svn.openslam.org/data/svn/gma...

Anybody find it??

ps. I'm using ROS distribution "indigo".