vim - how to add doxygen highlighting to other filetypes, such as CUDA -

i programming in cuda , whereas c , c++ files automatically doxygen highlighting setting

let g:load_doxygen_syntax=1 

in ~/.vimrc, cuda files (.cu , .cuh) not. how can add doxygen highlighting them, on top of existing cuda highlighting?

add following ~/.vimrc:

au syntax cuda         \ if (exists('b:load_doxygen_syntax') && b:load_doxygen_syntax)         \       || (exists('g:load_doxygen_syntax') && g:load_doxygen_syntax)         \   | runtime! syntax/doxygen.vim         \ | endif 

add filetypes want doxygen highlighting comma-separated list after au syntax. snippet (taken syntax/synload.vim) respects load_doxygen_syntax setting.