Copies the source var that has data stored on the OpenCL device to destination Eigen matrix containing vars. 
- Template Parameters
 - 
  
    | T | type of the matrix or expression on the OpenCL device  | 
  
   
- Parameters
 - 
  
  
 
- Returns
 - var with a copy of the data on the host 
 
Definition at line 209 of file copy.hpp.