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Dan's answer is correct for describing what a float64 is.

If you want to get rid of the error you are seeing you probably need to have the following in your source (or header) file:

#include <std_msgs/Float64.h>

Check out the std_msgs and float64 wiki pages. You may also need to add std_msgs to your package.xml and CMakeLists.txt files in your package.

Dan's answer is correct for describing what a float64 is.

If you want to get rid of the error you are seeing you probably need to have the following in your source (or header) file:

#include <std_msgs/Float64.h>

and change your variable declaration to:

std_msgs::Float64 direction_x_;

Check out the std_msgs and float64 wiki pages. You may also need to add std_msgs to your package.xml and CMakeLists.txt files in your package.