How to emulate Emacs’ transpose-words in Vim?

SOME_BOOST_PP_BLACK_MAGIC( (a)(b)(c) )
//             with cursor here ^

%#

" swap two words
:vnoremap <C-X> <Esc>`.``gvP``P
" Swap word with next word
nmap <silent> gw    "_yiw:s/(%#w+)(_W+)(w+)/321/<cr><c-o><c-l> *N*

dw wP

2dw bhP

map L dwwP
map M 2dwbhP