vim mucomplete with cpp

Add LanguageClient-neovim settings:

let g:LanguageClient_serverCommands = {
    \ 'cpp': ['/usr/local/bin/clangd']
    \ }

" Alternatively, with cquery:
"let g:LanguageClient_serverCommands = {
"    \ 'cpp': ['/usr/local/bin/cquery',
"    \ '--init={"cacheDirectory":"/tmp/cquery/"}'],
"    \ 'c': ['/usr/local/bin/cquery',
"    \ '--init={"cacheDirectory":"/tmp/cquery/"}']
"    \ }

if !has('nvim')
  packadd nvim-yarp
  packadd vim-hug-neovim-rpc
endif
packadd LanguageClient-neovim

Trigger completion using vim-mucomplete:

set complete=.,w,b,u,k
set completeopt=menuone,noselect
let g:mucomplete#enable_auto_at_startup = 1
let g:mucomplete#chains = {}
let g:mucomplete#chains.default = ['omni', 'c-n', 'path', 'tags', 'dict']
let s:cpp_cond = { t -> t =~# '\%(->\|::\|\.\)$' }
let g:mucomplete#can_complete = {}
let g:mucomplete#can_complete.cpp = { 'omni': s:cpp_cond }
packadd vim-mucomplete

If it seems that autocompletion is not working correctly under all circumstances (e.g., after . or ->), add this to your configuration:

let g:mucomplete#completion_delay = 100
let g:mucomplete#reopen_immediately = 0

This requires Vim 8.0.0283 compiled with +timers.